I'm using Google AdMob to display native ads on my app. I made everything as in the Google Documentation. After testing, I figured out that test ad values are loading successfully since they aren't nil and when I print them, I can see them as they should display. However data is not displaying on my GADNativeAdView. Here is some of my code:
var nativeAdView: GADNativeAdView! {
didSet {
nativeAdView.translatesAutoresizingMaskIntoConstraints = false
containerView.addSubview(nativeAdView)
nativeAdView.leftAnchor.constraint(equalTo: collectionView4.leftAnchor).isActive = true
nativeAdView.rightAnchor.constraint(equalTo: collectionView4.rightAnchor).isActive = true
nativeAdView.topAnchor.constraint(equalTo: collectionView4.bottomAnchor, constant: 10).isActive = true
nativeAdView.heightAnchor.constraint(equalToConstant: 310).isActive = true
}
}
var adLoader: GADAdLoader!
// MARK: - Google Mobile Ads
extension HomeController: GADNativeAdLoaderDelegate, GADNativeAdDelegate {
private func setupAd() {
let multipleAdsOptions = GADMultipleAdsAdLoaderOptions()
multipleAdsOptions.numberOfAds = 1
adLoader = GADAdLoader(adUnitID: testNativeId, rootViewController: self,
adTypes: [.native],
options: [multipleAdsOptions])
adLoader.delegate = self
adLoader.load(GADRequest())
}
func imageOfStars(from starRating: NSDecimalNumber?) -> UIImage? {
guard let rating = starRating?.doubleValue else {
return nil
}
if rating >= 5 {
return UIImage(named: "stars_5")
} else if rating >= 4.5 {
return UIImage(named: "stars_4_5")
} else if rating >= 4 {
return UIImage(named: "stars_4")
} else if rating >= 3.5 {
return UIImage(named: "stars_3_5")
} else {
return nil
}
}
func adLoader(_ adLoader: GADAdLoader, didReceive nativeAd: GADNativeAd) {
// Create and place ad in view hierarchy.
let nibView = Bundle.main.loadNibNamed("NativeAdView", owner: nil, options: nil)?.first
guard let nativeAdView = nibView as? GADNativeAdView else {
return
}
self.nativeAdView = nativeAdView
nativeAd.delegate = self
(nativeAdView.headlineView as? UILabel)?.text = nativeAd.headline
nativeAdView.mediaView?.mediaContent = nativeAd.mediaContent
(nativeAdView.bodyView as? UILabel)?.text = nativeAd.body
nativeAdView.bodyView?.isHidden = nativeAd.body == nil
(nativeAdView.callToActionView as? UIButton)?.setTitle(nativeAd.callToAction, for: .normal)
nativeAdView.callToActionView?.isHidden = nativeAd.callToAction == nil
(nativeAdView.iconView as? UIImageView)?.image = nativeAd.icon?.image
nativeAdView.iconView?.isHidden = nativeAd.icon == nil
(nativeAdView.starRatingView as? UIImageView)?.image = imageOfStars(from: nativeAd.starRating)
nativeAdView.starRatingView?.isHidden = nativeAd.starRating == nil
(nativeAdView.storeView as? UILabel)?.text = nativeAd.store
nativeAdView.storeView?.isHidden = nativeAd.store == nil
(nativeAdView.priceView as? UILabel)?.text = nativeAd.price
nativeAdView.priceView?.isHidden = nativeAd.price == nil
(nativeAdView.advertiserView as? UILabel)?.text = nativeAd.advertiser
nativeAdView.advertiserView?.isHidden = nativeAd.advertiser == nil
nativeAdView.callToActionView?.isUserInteractionEnabled = false
nativeAdView.nativeAd = nativeAd
}
func adLoader(_ adLoader: GADAdLoader, didFailToReceiveAdWithError error: Error) {
print("ERROR: \(error.localizedDescription)")
}
}
Here is my .xib file:
The views custom class on the .xib file are set.
After trial and error I figured out that using #IBOutlet for views in the .xib file and calling them on the adLoader(_:) worked.
Related
In my swift code below right now the code saves 2 boolean values to a core data boolean value. The two values are true false. I would like the user to turn on the switch and have the 2nd value be true as well. So it would be true true. I am trying to do that in func alternate() but I dont know how to exactly effect a specific value. Looking for any kind of help.
import UIKit;import CoreData
class ViewController: UIViewController {
var lbl = UILabel()
var sw = UISwitch()
var checkmarkButton = UIButton()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
[ lbl,sw,checkmarkButton].forEach {
view.addSubview($0)
$0.translatesAutoresizingMaskIntoConstraints = false
$0.layer.borderWidth = 1
}
helpBool.shareInstance.saveBoolean(true)
helpBool.shareInstance.saveBoolean(false)
getBool(imageNo: 1)
}
func getBool(imageNo:Int) {
// first check the array bounds
let info = helpBool.shareInstance.fetchBool()
if info.count > imageNo {
// if info[imageNo].bool {
if info[imageNo].bool == true {
checkmarkButton.setImage(UIImage(named:"unnamed"), for: .normal);
}
if info[imageNo].bool == false {
checkmarkButton.setImage(nil, for: .normal);
}
// }
}
}
#objc func alternate(){
//fetch alternate
getBool(imageNo: 1)
if sw.isOn = true {
helpBool.shareInstance.saveBoolean()
}
else {
helpBool.shareInstance.saveBoolean()
}
}
}
class helpBool: UIViewController{
static let shareInstance = helpBool()
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
func saveBoolean(_ boolean: Bool) {
let imageInstance = OnOff(context: context)
imageInstance.bool = boolean
do {
try context.save()
print("text is saved")
} catch {
print(error.localizedDescription)
}
}
func fetchBool() -> [OnOff] {
var fetchingImage = [OnOff]()
let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "OnOff")
do {
fetchingImage = try context.fetch(fetchRequest) as! [OnOff]
} catch {
print("Error while fetching the image")
}
return fetchingImage
}
}
I have a custom view controller class which presents an alert controller when it receives a not connected notification from my network services class. I want to dismiss the alert controller when I receive a further connected notification from the network services class but I am unable to dismiss the presenting alert.
Here is my custom view controller class;
class CompanyPriceListVC: UITableViewController {
// MARK: - Properties
let companyStockSymbols = ["AAPL","AMZN", "MSFT", "GOOGL", "TSLA", "META","COINBASE:BTC", "BINANCE:BTCUSDT", "BINANCE:BNBBTC", "IC MARKETS:1", "IC MARKETS:2"]
let defaultStockInfo = StockInfo(tradeConditions: nil, price: 0.00, symbol: "-", timestamp: 0.0, volume: 0.0)
lazy var companyStockInfo = [StockInfo](repeating: defaultStockInfo, count: companyStockSymbols.count)
var companyDetailsVC:CompanyDetailsVC?
var tableRowSelected: Int?
let defaultPriceHistory = PriceHistory(previous: nil, relative: 0.0, absolute: 0.0)
lazy var priceHistory = [PriceHistory](repeating: defaultPriceHistory , count: companyStockSymbols.count)
var deviceOrientation: Orientation = .portrait
let activityIndicator: UIActivityIndicatorView = {
let activityIndicator = UIActivityIndicatorView()
activityIndicator.style = .large
activityIndicator.hidesWhenStopped = true
activityIndicator.color = .white
activityIndicator.translatesAutoresizingMaskIntoConstraints = false
activityIndicator.startAnimating()
return activityIndicator
}()
let isConnected = Notification.Name(rawValue: isConnectedNotificationKey)
let isNotConnected = Notification.Name(rawValue: isDisconnectedNotificationKey)
let alertController = UIAlertController(title: "Connectivity Error", message: "Network connection lost. Please check your WiFi settings, mobile data settings or reception coverage.", preferredStyle: .alert)
// MARK: - Lifecycle Methods
override func viewDidLoad() {
super.viewDidLoad()
if UIDevice.current.orientation.isPortrait {
self.deviceOrientation = .portrait
self.tableView.register(CompanyStockCellPortrait.self, forCellReuseIdentifier: "CompanyStockCellPortrait")
} else {
self.deviceOrientation = .landscape
self.tableView.register(CompanyStockCellLandscape.self, forCellReuseIdentifier: "CompanyStockCellLandscape")
}
configureNavigationBar()
view.backgroundColor = .black
configureTableView()
configureConstraints()
createObservers()
}
deinit {
NotificationCenter.default.removeObserver(self)
}
private func createObservers() {
NotificationCenter.default.addObserver(self, selector: #selector(CompanyPriceListVC.dismissAndFetchStockInfo), name: isConnected, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(CompanyPriceListVC.notifyUserOnScreen(notification:)), name: isNotConnected, object: nil)
}
#objc private func fetchStockInfo() {
NetworkServices.sharedInstance.fetchStockInfo(symbols: companyStockSymbols, delegate: self)
}
#objc private func notifyUserOnScreen(notification: NSNotification) {
self.present(alertController, animated: true)
}
#objc public func dismissAndFetchStockInfo() {
print("DEBUG: isBeingPresented: \(alertController.isBeingPresented)")
if alertController.isBeingPresented {
self.alertController.dismiss(animated: true, completion: nil)
}
fetchStockInfo()
}
override func willTransition(to newCollection: UITraitCollection, with coordinator: UIViewControllerTransitionCoordinator) {
super.willTransition(to: newCollection, with: coordinator)
coordinator.animate(alongsideTransition: { (context) in
guard let windowInterfaceOrientation = self.windowInterfaceOrientation else { return }
if windowInterfaceOrientation.isPortrait {
self.deviceOrientation = .portrait
self.tableView.register(CompanyStockCellPortrait.self, forCellReuseIdentifier: "CompanyStockCellPortrait")
self.tableView.reloadData()
} else {
self.deviceOrientation = .landscape
self.tableView.register(CompanyStockCellLandscape.self, forCellReuseIdentifier: "CompanyStockCellLandscape")
self.tableView.reloadData()
}
})
}
private var windowInterfaceOrientation: UIInterfaceOrientation? {
return self.view.window?.windowScene?.interfaceOrientation
}
// MARK: - TableView Data Source Methods
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return companyStockInfo.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
switch deviceOrientation {
case .portrait:
let tableViewCellPortrait = tableView.dequeueReusableCell(withIdentifier: "CompanyStockCellPortrait", for: indexPath) as! CompanyStockCellPortrait
tableViewCellPortrait.symbolValue.text = companyStockInfo[indexPath.row].symbol
var latestPrice = companyStockInfo[indexPath.row].price
latestPrice = round(latestPrice * 100.0) / 100.00
tableViewCellPortrait.priceValue.text = String(format: "%.2f", arguments:[latestPrice])
if let _ = priceHistory[indexPath.row].previous {
let absoluteDifference = priceHistory[indexPath.row].absolute
let relativeDifference = priceHistory[indexPath.row].relative
if absoluteDifference > 0.0 {
tableViewCellPortrait.priceDirectionImageView.image = UIImage(systemName: "arrowtriangle.up.fill")
tableViewCellPortrait.priceDirectionImageView.tintColor = .systemGreen
tableViewCellPortrait.relativePriceDiffValue.text = String(format: "%.2f%%", arguments: [relativeDifference])
tableViewCellPortrait.relativePriceDiffValue.textColor = .systemGreen
tableViewCellPortrait.absolutePriceDiffValue.text = String(format: "(%.2f)", arguments: [absoluteDifference])
tableViewCellPortrait.absolutePriceDiffValue.textColor = .systemGreen
} else if absoluteDifference < 0.0 {
tableViewCellPortrait.priceDirectionImageView.image = UIImage(systemName: "arrowtriangle.down.fill")
tableViewCellPortrait.priceDirectionImageView.tintColor = .systemRed
tableViewCellPortrait.relativePriceDiffValue.text = String(format: "%.2f%%", arguments: [relativeDifference])
tableViewCellPortrait.relativePriceDiffValue.textColor = .systemRed
tableViewCellPortrait.absolutePriceDiffValue.text = String(format: "(%.2f)", arguments: [absoluteDifference])
tableViewCellPortrait.absolutePriceDiffValue.textColor = .systemRed
} else {
tableViewCellPortrait.priceDirectionImageView.image = UIImage(systemName: "diamond.fill")
tableViewCellPortrait.priceDirectionImageView.tintColor = .white
tableViewCellPortrait.relativePriceDiffValue.text = "0.00%"
tableViewCellPortrait.relativePriceDiffValue.textColor = .white
tableViewCellPortrait.absolutePriceDiffValue.text = "(0.00)"
tableViewCellPortrait.absolutePriceDiffValue.textColor = .white
}
} else {
tableViewCellPortrait.priceDirectionImageView.image = UIImage()
tableViewCellPortrait.priceDirectionImageView.tintColor = .white
tableViewCellPortrait.relativePriceDiffValue.text = ""
tableViewCellPortrait.absolutePriceDiffValue.text = ""
}
return tableViewCellPortrait
case .landscape:
let tableViewCellLandscape = tableView.dequeueReusableCell(withIdentifier: "CompanyStockCellLandscape", for: indexPath) as! CompanyStockCellLandscape
tableViewCellLandscape.symbolValue.text = companyStockInfo[indexPath.row].symbol
var latestPrice = companyStockInfo[indexPath.row].price
latestPrice = round(latestPrice * 100.0) / 100.00
tableViewCellLandscape.priceValue.text = String(format: "%.2f", arguments:[latestPrice])
if let _ = priceHistory[indexPath.row].previous {
let absoluteDifference = priceHistory[indexPath.row].absolute
let relativeDifference = priceHistory[indexPath.row].relative
if absoluteDifference > 0.0 {
tableViewCellLandscape.priceDirectionImageView.image = UIImage(systemName: "arrowtriangle.up.fill")
tableViewCellLandscape.priceDirectionImageView.tintColor = .systemGreen
tableViewCellLandscape.relativePriceDiffValue.text = String(format: "%.2f%%", arguments: [relativeDifference])
tableViewCellLandscape.relativePriceDiffValue.textColor = .systemGreen
tableViewCellLandscape.absolutePriceDiffValue.text = String(format: "(%.2f)", arguments: [absoluteDifference])
tableViewCellLandscape.absolutePriceDiffValue.textColor = .systemGreen
} else if absoluteDifference < 0.0 {
tableViewCellLandscape.priceDirectionImageView.image = UIImage(systemName: "arrowtriangle.down.fill")
tableViewCellLandscape.priceDirectionImageView.tintColor = .systemRed
tableViewCellLandscape.relativePriceDiffValue.text = String(format: "%.2f%%", arguments: [relativeDifference])
tableViewCellLandscape.relativePriceDiffValue.textColor = .systemRed
tableViewCellLandscape.absolutePriceDiffValue.text = String(format: "(%.2f)", arguments: [absoluteDifference])
tableViewCellLandscape.absolutePriceDiffValue.textColor = .systemRed
} else {
tableViewCellLandscape.priceDirectionImageView.image = UIImage(systemName: "diamond.fill")
tableViewCellLandscape.priceDirectionImageView.tintColor = .white
tableViewCellLandscape.relativePriceDiffValue.text = "0.00%"
tableViewCellLandscape.relativePriceDiffValue.textColor = .white
tableViewCellLandscape.absolutePriceDiffValue.text = "(0.00)"
tableViewCellLandscape.absolutePriceDiffValue.textColor = .white
}
} else {
tableViewCellLandscape.priceDirectionImageView.image = UIImage()
tableViewCellLandscape.priceDirectionImageView.tintColor = .white
tableViewCellLandscape.relativePriceDiffValue.text = ""
tableViewCellLandscape.absolutePriceDiffValue.text = ""
}
return tableViewCellLandscape
}
}
// MARK: - TableView Delegate Methods
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 100.0
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
companyDetailsVC = CompanyDetailsVC(companyStockInfo: companyStockInfo[indexPath.row])
tableRowSelected = indexPath.row
navigationController?.pushViewController(companyDetailsVC!, animated: true)
}
// MARK: - Helper Functions
private func configureNavigationBar() {
UINavigationBar.appearance().titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.white]
navigationController?.navigationBar.topItem?.title = "Trade Tracker"
navigationController?.navigationBar.barStyle = .black
navigationController?.navigationBar.prefersLargeTitles = true
}
private func configureTableView() {
tableView.delegate = self
tableView.dataSource = self
tableView.separatorStyle = .singleLine
tableView.separatorColor = .white
tableView.tableFooterView = UIView()
}
private func configureConstraints() {
tableView.addSubview(activityIndicator)
NSLayoutConstraint.activate([
activityIndicator.centerXAnchor.constraint(equalTo: tableView.centerXAnchor),
activityIndicator.topAnchor.constraint(equalTo: tableView.topAnchor, constant: 250)
])
tableView.layoutSubviews()
}
}
// MARK: - Network Service Delegate Method
extension CompanyPriceListVC: NetworkServicesDelegate {
func sendStockInfo(stocksInfo: [String : StockInfo]) {
DispatchQueue.main.async {
// Compute absolute and relative price differences
for (index, symbol) in self.companyStockSymbols.enumerated() {
if stocksInfo[symbol] != nil {
self.priceHistory[index].previous = self.companyStockInfo[index].price
self.companyStockInfo[index] = stocksInfo[symbol]!
var latestPrice = self.companyStockInfo[index].price
latestPrice = round(latestPrice * 100.0) / 100.00
if let previous = self.priceHistory[index].previous {
let previousPrice = round(previous * 100.0) / 100.0
var absoluteDifference = latestPrice - previousPrice
absoluteDifference = round(absoluteDifference * 100.0) / 100.0
self.priceHistory[index].absolute = absoluteDifference
var relativeDifference = 0.0
if previousPrice != 0.00 {
relativeDifference = (absoluteDifference / previousPrice) * 100.0
relativeDifference = round(relativeDifference * 100) / 100.0
}
self.priceHistory[index].relative = relativeDifference
}
}
}
self.tableView.reloadData()
self.activityIndicator.stopAnimating()
guard let rowSelected = self.tableRowSelected else { return }
self.companyDetailsVC!.companyStockInfo = self.companyStockInfo[rowSelected]
self.companyDetailsVC!.relativeDifference = self.priceHistory[rowSelected].relative
self.companyDetailsVC!.absoluteDifference = self.priceHistory[rowSelected].absolute
}
}
}
and here is my network services class;
import UIKit
import Starscream
import Network
protocol NetworkServicesDelegate: AnyObject {
func sendStockInfo(stocksInfo: [String: StockInfo])
}
final class NetworkServices {
static let sharedInstance = NetworkServices()
var request = URLRequest(url: FINNHUB_SOCKET_STOCK_INFO_URL!)
var socket: WebSocket!
public private(set) var isConnected = false
var stocksInfo: [String: StockInfo] = [:]
var socketResults: [String: [StockInfo]] = [:]
weak var delegate: NetworkServicesDelegate?
var stockSymbols: [String] = []
private init() {
request.timeoutInterval = 5
socket = WebSocket(request: request)
socket.delegate = self
}
private let queue = DispatchQueue.global()
private let monitor = NWPathMonitor()
public func startMonitoring() {
monitor.start(queue: queue)
self.monitor.pathUpdateHandler = { [weak self] path in
if path.status == .satisfied {
// connect the socket
self?.socket.connect()
} else {
// disconnect the socket
self?.socket.disconnect()
// post notification that socket is now disconnected
DispatchQueue.main.async {
let name = Notification.Name(rawValue: isDisconnectedNotificationKey)
NotificationCenter.default.post(name: name, object: nil)
}
}
}
}
public func stopMonitoring() {
monitor.cancel()
}
func fetchStockInfo(symbols: [String], delegate: CompanyPriceListVC) {
stockSymbols = symbols
self.delegate = delegate
for symbol in symbols {
let string = FINNHUB_SOCKET_MESSAGE_STRING + symbol + "\"}"
socket.write(string: string)
}
}
private func parseJSONSocketData(_ socketString: String) {
self.socketResults = [:]
self.stocksInfo = [:]
let decoder = JSONDecoder()
do {
let socketData = try decoder.decode(SocketData.self, from: socketString.data(using: .utf8)!)
guard let stockInfoData = socketData.data else { return }
for stockInfo in stockInfoData {
let symbol = stockInfo.symbol
if self.socketResults[symbol] == nil {
self.socketResults[symbol] = [StockInfo]()
}
self.socketResults[symbol]?.append(stockInfo)
}
for (symbol, stocks) in self.socketResults {
for item in stocks {
if self.stocksInfo[symbol] == nil {
self.stocksInfo[symbol] = item
} else if item.timestamp > self.stocksInfo[symbol]!.timestamp {
self.stocksInfo[symbol] = item
}
}
}
self.delegate?.sendStockInfo(stocksInfo: self.stocksInfo)
} catch {
print("DEBUG: error: \(error.localizedDescription)")
}
}
func fetchCompanyInfo(symbol: String, completion: #escaping (CompanyInfo?, UIImage?)->()) {
let urlString = FINNHUB_HTTP_COMPANY_INFO_URL_STRING + symbol + "&token=" + FINNHUB_API_TOKEN
guard let url = URL(string: urlString) else { return }
let task = URLSession.shared.dataTask(with: url) { data, response, error in
if let error = error {
print("Error fetching company info: \(error)")
}
guard let data = data else { return }
let decoder = JSONDecoder()
do {
let companyInfo = try decoder.decode(CompanyInfo.self, from: data)
guard let logoURL = URL(string: companyInfo.logo) else { return }
let task = URLSession.shared.dataTask(with: logoURL) { data, response, error in
if let error = error {
print("Error fetching logo image: \(error)")
}
guard let data = data else { return }
guard let logoImage = UIImage(data: data) else { return }
completion(companyInfo, logoImage)
}
task.resume()
} catch {
print("Error decoding JSON: \(error)")
completion(nil, nil)
}
}
task.resume()
}
}
extension NetworkServices: WebSocketDelegate {
func didReceive(event: WebSocketEvent, client: WebSocket) {
switch event {
case .connected(_):
self.isConnected = true
// post notification that socket is now connected
let name = Notification.Name(rawValue: isConnectedNotificationKey)
NotificationCenter.default.post(name: name, object: nil)
case .disconnected(let reason, let code):
print("DEBUG: Got disconnected.")
self.isConnected = false
case .cancelled:
print("DEBUG: cancelled.")
// post notification that socket is not connected
case .reconnectSuggested(let suggestReconnect):
print("DEBUG: suggestReconnect = \(suggestReconnect)")
// post notification that socket is not connected
case .viabilityChanged(let viabilityChanged):
print("DEBUG: viabilityChange = \(viabilityChanged)")
case .error(let error):
print("DEBUG error: \(String(describing: error?.localizedDescription))")
case .text(let socketString):
parseJSONSocketData(socketString)
default:
break
}
}
}
I've tried querying the isBeingPresented property of the alert controller but it always tests as false even though I can see the alert controller is being presented.
You could do a check if the currently presented UIViewController is actually the alertController like this:
#objc public func dismissAndFetchStockInfo() {
if presentedViewController == alertController {
alertController.dismiss(animated: true, completion: nil)
}
fetchStockInfo()
}
This is because isBeingPresented is only valid inside the view[Will|Did][Disa|A]ppear methods.
I don't quite understand what I am doing wrong since I am very new to MVVM. It worked in MVC architecture. I've setup my VM and am able to get the first set of results and even then that's not working properly. I get 4 results instead of 10 which is what LOADLIMIT is set as. I was able to get it to work in an MVC architecture without any issues. The VM function which triggers the query is called multiple (3) times instead of just once i.e. even prior to scrolling.
Here is my VM:
enum FetchRestaurant {
case success
case error
case location
case end
}
class ListViewModel {
let restaurant: [Restaurant]?
let db = Firestore.firestore()
var restaurantArray = [Restaurant]()
var lastDocument: DocumentSnapshot?
var currentLocation: CLLocation?
typealias fetchRestaurantCallback = (_ restaurants: [Restaurant]?, _ message: String?, _ status: FetchRestaurant) -> Void
var restaurantFetched: fetchRestaurantCallback?
var fetchRestaurant: FetchRestaurant?
init(restaurant: [Restaurant]) {
self.restaurant = restaurant
}
func fetchRestaurantCallback (callback: #escaping fetchRestaurantCallback) {
self.restaurantFetched = callback
}
func fetchRestaurants(address: String) {
print("address received: \(address)")
getLocation(from: address) { location in
if let location = location {
self.currentLocation = location
self.queryGenerator(at: location)
} else {
self.restaurantFetched?(nil, nil, .location)
}
}
}
func queryGenerator(at location: CLLocation) {
var query: Query!
if restaurantArray.isEmpty {
query = db.collection("Restaurant_Data").whereField("distributionType", isLessThanOrEqualTo: 2).limit(to: Constants.Mealplan.LOADLIMIT)
} else {
print("last document:\(String(describing: lastDocument?.documentID))")
query = db.collection("Restaurant_Data").whereField("distributionType", isLessThanOrEqualTo: 2).start(afterDocument: lastDocument!).limit(to: Constants.Mealplan.LOADLIMIT)
}
batchFetch(query: query)
}
func batchFetch(query: Query) {
query.getDocuments { (querySnapshot, error) in
if let error = error {
self.restaurantFetched?(nil, error.localizedDescription, .error)
} else if querySnapshot!.isEmpty {
self.restaurantFetched?(nil, nil, .end)
} else if !querySnapshot!.isEmpty {
let queriedRestaurants = querySnapshot?.documents.compactMap { querySnapshot -> Restaurant? in
return try? querySnapshot.data(as: Restaurant.self)
}
guard let restaurants = queriedRestaurants,
let currentLocation = self.currentLocation else {
self.restaurantFetched?(nil, nil, .end)
return }
self.restaurantArray.append(contentsOf: self.applicableRestaurants(allQueriedRestaurants: restaurants, location: currentLocation))
DispatchQueue.main.asyncAfter(deadline: .now(), execute: {
self.restaurantFetched?(self.restaurantArray, nil, .success)
})
self.lastDocument = querySnapshot!.documents.last
}
}
}
func getLocation(from address: String, completionHandler: #escaping (_ location: CLLocation?) -> Void) {
let geocoder = CLGeocoder()
geocoder.geocodeAddressString(address) { (placemarks, error) in
guard let placemarks = placemarks,
let location = placemarks.first?.location else {
completionHandler(nil)
return
}
completionHandler(location)
}
}
}
And in the VC viewDidLoad:
var fetchMore = false
var reachedEnd = false
let leadingScreensForBatching: CGFloat = 5.0
var searchController = UISearchController(searchResultsController: nil)
var currentAddress : String?
var listViewModel = ListViewModel(restaurant: [Restaurant]())
override func viewDidLoad() {
super.viewDidLoad()
listViewModel.fetchRestaurantCallback { (restaurants, error, result) in
switch result {
case .success :
self.loadingShimmer.stopShimmering()
self.loadingShimmer.removeFromSuperview()
guard let fetchedRestaurants = restaurants else { return }
self.restaurantArray.append(contentsOf: fetchedRestaurants)
self.tableView.reloadData()
self.fetchMore = false
case .location :
self.showAlert(alertTitle: "No businesses nearby", message: "Try going back and changing the address")
case .error :
guard let error = error else { return }
self.showAlert(alertTitle: "Error", message: error)
case .end :
self.fetchMore = false
self.reachedEnd = true
}
}
if let currentAddress = currentAddress {
listViewModel.fetchRestaurants(address: currentAddress)
}
}
I would really appreciate links or resources for implementing MVVM in Swift for a Firestore back-end. I'm coming up short on searches here and on Google. Even tried medium.
EDIT
class ListViewController: UITableViewController {
lazy var loadingShimmer: UIImageView = {
let image = UIImage(named: "shimmer_background")
let imageview = UIImageView(image: image)
imageview.contentMode = .top
imageview.translatesAutoresizingMaskIntoConstraints = false
return imageview
}()
var restaurantArray = [Restaurant]()
var planDictionary = [String: Any]()
var fetchMore = false
var reachedEnd = false
let leadingScreensForBatching: CGFloat = 5.0
var searchController = UISearchController(searchResultsController: nil)
var currentAddress : String?
var listViewModel = ListViewModel(restaurant: [Restaurant]())
override func viewDidLoad() {
super.viewDidLoad()
setupTable()
}
override func viewWillAppear(_ animated: Bool) {
clearsSelectionOnViewWillAppear = false
}
func setupTable() {
navigationItem.backBarButtonItem = UIBarButtonItem(title: "Restaurant", style: .plain, target: nil, action: nil)
tableView.register(RestaurantCell.self, forCellReuseIdentifier: "Cell")
tableView.delegate = self
tableView.dataSource = self
let navigationBarHeight: CGFloat = self.navigationController!.navigationBar.frame.height
tableView.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: -navigationBarHeight, right: 0)
tableView.separatorStyle = .none
tableView.showsVerticalScrollIndicator = false
tableView.addSubview(loadingShimmer)
loadingShimmer.topAnchor.constraint(equalTo: tableView.safeAreaLayoutGuide.topAnchor).isActive = true
loadingShimmer.leadingAnchor.constraint(equalTo: tableView.leadingAnchor).isActive = true
loadingShimmer.trailingAnchor.constraint(equalTo: tableView.trailingAnchor).isActive = true
loadingShimmer.startShimmering()
initialSetup()
}
func initialSetup() {
let addressOne = planDictionary["addressOne"] as! String + ", "
let city = planDictionary["city"] as! String + ", "
let postalCode = planDictionary["postalCode"] as! String
currentAddress = addressOne + city + postalCode
setupSearch()
listViewModel.fetchRestaurantCallback { (restaurants, error, result) in
switch result {
case .success :
self.loadingShimmer.stopShimmering()
self.loadingShimmer.removeFromSuperview()
guard let fetchedRestaurants = restaurants else { return }
self.restaurantArray.append(contentsOf: fetchedRestaurants)
self.tableView.reloadData()
self.fetchMore = false
case .location :
self.showAlert(alertTitle: "No businesses nearby", message: "Try going back and changing the address")
case .error :
guard let error = error else { return }
self.showAlert(alertTitle: "Error", message: error)
case .end :
self.fetchMore = false
self.reachedEnd = true
}
}
if let currentAddress = currentAddress {
listViewModel.fetchRestaurants(address: currentAddress)
}
}
override func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
let off = scrollView.contentOffset.y
let off1 = scrollView.contentSize.height
if off > off1 - scrollView.frame.height * leadingScreensForBatching {
print("\(fetchMore), \(reachedEnd)")
if !fetchMore && !reachedEnd {
if let address = self.currentAddress {
print("address sent: \(address)")
listViewModel.fetchRestaurants(address: address)
}
}
}
}
}
That you're only getting back 4 results instead of 10 is not due to a faulty query or get-document request—those are coded properly. You're either losing documents when you parse them (some are failing Restaurant initialization), Constants.Mealplan.LOADLIMIT is wrong, or there aren't more than 4 documents in the collection itself that satisfy the query.
That the query is executed 3 times instead of once is also not due to anything in this code—viewDidLoad is only called once and geocodeAddressString only returns once. You're making a fetch request elsewhere that we can't see.
In the batchFetch method, you have a guard that returns out of the function without ever calling its completion handler. This will leave the UI in a state of limbo. I'd recommend always calling the completion handler no matter why the function returns.
You never manage the document cursor. If the get-document return has less documents than the load limit, then nil the last-document cursor. This way, when you attempt to get the next page of documents, guard against a nil cursor and see if there is even more to fetch.
There's no need to pass in an empty array and have your function fill it; simply construct and return an array of results within ListViewModel itself.
We can't see how you trigger pagination. Is it through a scroll delegate when the user reaches the bottom or through a button tap, for example? If it's through a scroll delegate, then I'd disable that for now and see how many returns you get—I suspect one, instead of 3.
What is the particular reason you've ditched MVC for MVVM here? With MVC, you can get pagination up with just a few lines of code. I think MVVM is overkill for iOS applications and would advise against using it unless you have a compelling reason.
Looking for a way to either get or calculate the wifi strength of a device? Have seen examples of scraping the status bar but cannot get it to work on iOS 11:
func getSignalStrength() -> Int {
let application = UIApplication.shared
let statusBarView = application.value(forKey: "statusBar") as! UIView
let foregroundView = statusBarView.value(forKey: "foregroundView") as! UIView
let foregroundViewSubviews = foregroundView.subviews
var dataNetworkItemView:UIView!
for subview in foregroundViewSubviews {
if subview.isKind(of: NSClassFromString("UIStatusBarSignalStrengthItemView")!) {
dataNetworkItemView = subview
print("NONE")
break
} else {
print("NONE")
return 0 //NO SERVICE
}
}
return dataNetworkItemView.value(forKey: "signalStrengthBars") as! Int
}
Any clever ideas?
Does not need to be approved by apple
The code you have is for the mobile network(2G/3G/4G etc), not for WiFi network.
Try the code below in Swift4, it works on my iOS11:
private func wifiStrength() -> Int? {
let app = UIApplication.shared
var rssi: Int?
guard let statusBar = app.value(forKey: "statusBar") as? UIView, let foregroundView = statusBar.value(forKey: "foregroundView") as? UIView else {
return rssi
}
for view in foregroundView.subviews {
if let statusBarDataNetworkItemView = NSClassFromString("UIStatusBarDataNetworkItemView"), view .isKind(of: statusBarDataNetworkItemView) {
if let val = view.value(forKey: "wifiStrengthRaw") as? Int {
//print("rssi: \(val)")
rssi = val
break
}
}
}
return rssi
}
How to get the WiFi strength on iPhoneX, check my answer in another post: Using Private API To read WiFi RSSI Value
You can use this code of every device include all new iphones
class DeviceType {
static let deviceType = UIDevice.current.modelName
class func getDevice() -> Devices{
switch deviceType {
case "iPhone10,3", "iPhone10,6":
print("iPhoneX")
return Devices.iPhoneX
case "iPhone11,2":
print("iPhone XS")
return Devices.iPhoneXS
case "iPhone11,4":
print("iPhone XS Max")
return Devices.iPhoneXSMax
case "iPhone11,6":
print("iPhone XS Max China")
return Devices.iPhoneXSMaxChina
case "iPhone11,8":
print("iPhone XR")
return Devices.iPhoneXR
default:
return Devices.none
}
}
}
extension UIDevice {
var modelName: String {
var systemInfo = utsname()
uname(&systemInfo)
let machineMirror = Mirror(reflecting: systemInfo.machine)
let identifier = machineMirror.children.reduce("") { identifier, element in
guard let value = element.value as? Int8, value != 0 else { return identifier }
return identifier + String(UnicodeScalar(UInt8(value)))
}
return identifier
}
}
enum Devices {
case iPhoneX
case iPhoneXS
case iPhoneXSMax
case iPhoneXSMaxChina
case iPhoneXR
case none
}
func getSignalStrength() -> Int {
var classNameForStatusBar = ""
var valueForSignalValue = ""
classNameForStatusBar = "UIStatusBarSignalStrengthItemView"
valueForSignalValue = "signalStrengthBars"
let app = UIApplication.shared
let statusBarView = app.value(forKey: "statusBar") as! UIView
if UIDevice().userInterfaceIdiom == .phone {
switch UIScreen.main.nativeBounds.height {
case 2436, 2688, 1792:
print("iPhone X, XS")
return checkStatus(statusBarView)
default:
if(statusBarView.frame.width == 1024.0 || statusBarView.frame.width == 1112.0 || statusBarView.frame.width == 1024.0 || statusBarView.frame.width == 768.0){
if let viewStatus = statusBarView.value(forKey: "statusBar") as? UIView{
if let foregroundView = viewStatus.value(forKey: "foregroundView") as? UIView{
let subViews = foregroundView.subviews
var dataNetworkItemView:UIView?
for subview in subViews {
if subview.isKind(of: NSClassFromString(classNameForStatusBar)!){
dataNetworkItemView = subview;
break
}
}
guard let signal = dataNetworkItemView?.value(forKey: valueForSignalValue) as? Int else { return 0 }
return signal
}
}
return 0
}
print("Unknown")
if let foregroundView = statusBarView.value(forKey: "foregroundView") as? UIView{
let subViews = foregroundView.subviews
var dataNetworkItemView:UIView?
for subview in subViews {
if subview.isKind(of: NSClassFromString(classNameForStatusBar)!){
dataNetworkItemView = subview;
break
}
}
guard let signal = dataNetworkItemView?.value(forKey: valueForSignalValue) as? Int else { return 0 }
return signal
}
}
}
return 0
}
private func checkStatus(_ statusBarView: UIView) -> Int{
if DeviceType.getDevice() == .iPhoneX{
if let viewStatus = statusBarView.value(forKey: "statusBar") as? UIView{
if let foregroundView = viewStatus.value(forKey: "foregroundView") as? UIView{
let subViews = foregroundView.subviews
var dataNetworkItemView:UIView?
for subview in subViews {
for localSubView in subview.subviews{
if localSubView.isKind(of: NSClassFromString("_UIStatusBarCellularSignalView")!){
dataNetworkItemView = localSubView
break
}
}
}
if dataNetworkItemView == nil{
return 0
}else{
return 1
}
// guard let signal = dataNetworkItemView?.value(forKey: "signalStrengthBars") as? Int else { return 0 }
// return signal
}
}
}else{
if let viewStatus = statusBarView.value(forKey: "statusBar") as? UIView{
if let foregroundView = viewStatus.value(forKey: "foregroundView") as? UIView{
let subViews = foregroundView.subviews
var dataNetworkItemView:UIView?
print(foregroundView)
print(viewStatus)
print(statusBarView)
for subview in subViews {
for localSubview in subview.subviews{
if localSubview.isKind(of: NSClassFromString("_UIStatusBarDualCellularSignalView")!){
dataNetworkItemView = subview;
break
}else if localSubview.isKind(of: NSClassFromString("_UIStatusBarCellularSignalView")!){
print("Check this")
}
}
}
if dataNetworkItemView == nil{
return 0
}else{
return 1
}
}
}
}
return 0
}
Just copy paste this code in any swift file.
Tried so many times to find out what causes the fatal error. But, still can't figure it out. The first table (result table) causes this error when I try to refresh the table with pull. The second table (favoriteProductTableView) works perfect, so I didn't put any code about the second one. Wondering why. Thank you for your help.
var followArray = [String]()
var resultsNameArray = [String]()
var resultsImageFiles = [PFFile?]()
var resultsDetailsArray = [String]()
var resultsDetailsImageFiles = [PFFile?]()
var resultsObjectID = [String]()
var resultsTitle = [String]()
var personPriceArray = [String]()
var personQuantityArray = [String]()
var personOrderTypeArray = [String]()
var refresher:UIRefreshControl!
override func viewDidLoad() {
super.viewDidLoad()
favoriteProductTableView.hidden = true
refresher = UIRefreshControl()
refresher.tintColor = UIColor.blackColor()
refresher.addTarget(self, action: "refresh", forControlEvents: UIControlEvents.ValueChanged)
self.resultsTable.addSubview(refresher)
}
override func viewDidAppear(animated: Bool) {
refreshResults()
}
func refresh(){
refreshResults()
}
func refreshResults(){
switch(segmentedControl.selectedSegmentIndex){
case 0:
followArray.removeAll(keepCapacity: false)
resultsNameArray.removeAll(keepCapacity: false)
resultsImageFiles.removeAll(keepCapacity: false)
resultsDetailsArray.removeAll(keepCapacity: false)
resultsDetailsImageFiles.removeAll(keepCapacity: false)
resultsObjectID.removeAll(keepCapacity: false)
resultsTitle.removeAll(keepCapacity: false)
personPriceArray.removeAll(keepCapacity: false)
personQuantityArray.removeAll(keepCapacity: false)
personOrderTypeArray.removeAll(keepCapacity: false)
let followQuery = PFQuery(className: "follow")
followQuery.whereKey("user", equalTo: (PFUser.currentUser()!.username)!)
followQuery.whereKey("userToFollow", notEqualTo: (PFUser.currentUser()!.username)!)
followQuery.findObjectsInBackgroundWithBlock { (objects:[PFObject]?, error: NSError?) -> Void in
if error != nil {
}
for object in objects! {
self.followArray.append(object.objectForKey("userToFollow") as! String)
}
let query = PFQuery(className: "products")
query.whereKey("userName", containedIn: self.followArray)
query.findObjectsInBackgroundWithBlock { (catchobjects:[PFObject]?, error:NSError?) -> Void in
if error != nil {
}
for catchobject in catchobjects! {
if catchobject.objectForKey("selling_price") != nil {
self.personPriceArray.append(catchobject.objectForKey("selling_price") as! String)
self.personOrderTypeArray.append("Selling")
} else {
self.personPriceArray.append(catchobject.objectForKey("buying_price") as! String)
self.personOrderTypeArray.append("Buying")
}
self.personQuantityArray.append(catchobject.objectForKey("quantity") as! String)
self.resultsNameArray.append(catchobject.objectForKey("unique_username") as! String)
self.resultsImageFiles.append(catchobject.objectForKey("profile_picture") as? PFFile)
self.resultsDetailsArray.append(catchobject.objectForKey("details") as! String)
self.resultsDetailsImageFiles.append(catchobject.objectForKey("detailsImage") as? PFFile)
self.resultsTitle.append(catchobject.objectForKey("title") as! String)
self.resultsObjectID.append(catchobject.objectId!)
}
dispatch_async(dispatch_get_main_queue()) {
self.resultsTable.reloadData()
}
self.loadEmptyLabel(self.resultsTable)
}
self.refresher.endRefreshing()
}
break
case 1:
...
break
default:
break
}
}
func loadEmptyLabel(tableView: UITableView) {
let emptyLabel = UILabel(frame: CGRectMake(0, 0, UIScreen.mainScreen().bounds.width, UIScreen.mainScreen().bounds.height))
emptyLabel.textAlignment = NSTextAlignment.Center
emptyLabel.textColor = UIColor.blackColor()
emptyLabel.text = "No matched result found."
tableView.backgroundView = emptyLabel
tableView.separatorStyle = UITableViewCellSeparatorStyle.None
var resultCount = Int()
if tableView == resultsTable {
resultCount = resultsNameArray.count
} else {
resultCount = resultsTitleArray.count
}
if resultCount == 0 {
tableView.reloadData()
emptyLabel.hidden = false
} else {
emptyLabel.hidden = true
}
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
var numRow: Int = 0
switch(segmentedControl.selectedSegmentIndex){
case 0:
numRow = resultsNameArray.count
break
case 1:
numRow = resultsTitleArray.count
break
default:
break
}
return numRow
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
if tableView == resultsTable {
let cell:favoritedTableViewCell = resultsTable.dequeueReusableCellWithIdentifier("Cell") as! favoritedTableViewCell
cell.profileLbl.text = self.resultsNameArray[indexPath.row]
cell.messageTxt.text = self.resultsDetailsArray[indexPath.row]
cell.priceLabel.text = "\(self.personOrderTypeArray[indexPath.row]) \(self.personQuantityArray[indexPath.row]) for $\(self.personPriceArray[indexPath.row])"
cell.titleLabel.text = self.resultsTitle[indexPath.row]
if resultsImageFiles[indexPath.row] != nil {
resultsImageFiles[indexPath.row]!.getDataInBackgroundWithBlock { (imageData:NSData?, error:NSError?) -> Void in
if error == nil{
let image = UIImage(data: imageData!)
cell.imgView.image = image
}
}
} else {
cell.imgView.image = UIImage(named: "Profile Picture")
}
if resultsDetailsImageFiles[indexPath.row] != nil{
resultsDetailsImageFiles[indexPath.row]?.getDataInBackgroundWithBlock({ (imageData:NSData?, error:NSError?) -> Void in
if error == nil{
let image = UIImage(data: imageData!)
cell.detailsImg.image = image
}
})
} else {
cell.detailsImg.image = UIImage(named: "Profile Picture")
}
return cell
} else {
....
}
}
Your numberOfRowsInSection function returns one of two array lengths based on segmentedControl.selectedSegmentIndex, whereas cellForRowAtIndexPath indexes the arrays based on the tableView being displayed. This doesn't look right, especially given your referencing `` which doesn't appear to be populated anywhere - should it just be resultsTitle?.
Also, you're calling self.resultsTable.reloadData() from a background thread. This is bad - it must be called from the main thread using:
dispatch_async(dispatch_get_main_queue()) {
self.resultsTable.reloadData()
}
Nevertheless, it's not clear why you've got this inside the loop either.