i have a firestore request where i put data in my arrays, but when i do object of this class in another ViewContollers i have nil.
Struct
struct Game {
var gameCategories = ["Classic", "Relationship"]
var classicCategory: [String]? = []
var relationshipCategory: [String]? = []
var mineCategory: [String]? = []
}
Class where i fetch data
class DataBaseFirestore {
let db = Firestore.firestore()
var game = Game(classicCategory: [], relationshipCategory: [], mineCategory: [])
func getData() {
db.collection("Classic").getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents \(err)")
} else {
for document in querySnapshot!.documents {
if let name = document.data()["classic"] as? [String],
let name2 = document.data()["relationship"] as? [String] {
self.game.classicCategory?.append(contentsOf: name)
self.game.relationshipCategory?.append(contentsOf: name2)
print(name2)
print(name)
}
}
}
}
}
}
When i fetch data in FirstViewContoller
override func viewDidLoad() {
super.viewDidLoad()
self.loadingDataIndicator.startAnimating()
data.getData()
DispatchQueue.main.asyncAfter(deadline: .now() + 3.0) {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewController(withIdentifier: "MainViewController") as! MainViewController
self.navigationController?.pushViewController(vc, animated: true)
}
}
When i use this in another SecondViewContoller i get nil, whats wrong?
var data = DataBaseFirestore()
data.game.classicCategory?.count
P.S. How can i do loadingIndicator.startAnimating() while i fetching data from firestore? I did it in URLSession and in Alamofire but cant find the way how should i use it here
Related
I am using this line below :
self.present(activityViewController, animated: true, completion: nil)
And I am getting an error of - Use of unresolved identifier 'self'. Any ideas about how to resolve this? To me it looks as it it is subordinate to the class, but clearly doing something wrong. Any help would be appreciated.
import UIKit
import CoreData
class CoreDataViewController: UIViewController {
#IBOutlet weak var CoreDataView: UITableView!
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
var items:[Checkins]?
var btnnames = [""]
override func viewDidLoad() {
super.viewDidLoad()
// CoreDataView.dataSource = self
// CoreDataView.delegate = self
storeTranscription()
// Loads the current data
getTranscriptions()
// fetchCheckins()
let btn1name = btnnames[0]
let btn2name = btnnames[1]
let btn3name = btnnames[2]
let btn4name = btnnames[3]
let btn5name = btnnames[4]
let btn6name = btnnames[5]
// print(btnnames)
print(btn1name, btn2name, btn3name, btn4name, btn5name, btn6name)
}
#IBAction func export(_ sender: Any) {
exportDatabase()
}
#IBOutlet weak var Table_label: UILabel!
}
var CheckinDate: Date? = Date()
var fetchedStatsArray: [NSManagedObject] = []
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
func storeTranscription() {
//retrieve the entity that we just created
let entity = NSEntityDescription.entity(forEntityName: "Checkins", in: context)
let transc = NSManagedObject(entity: entity!, insertInto: context) as! Checkins
//set the entity values
transc.who = "Who"
transc.reason = "Reason for visit"
transc.date = CheckinDate
//save the object
do {
try context.save()
print("saved!")
} catch let error as NSError {
print("Could not save \(error), \(error.userInfo)")
} catch {
}
}
func getTranscriptions () {
//create a fetch request, telling it about the entity
let fetchRequest: NSFetchRequest<Checkins> = Checkins.fetchRequest()
do {
//go get the results
let searchResults = try context.fetch(fetchRequest)
fetchedStatsArray = searchResults as [NSManagedObject]
//I like to check the size of the returned results!
print ("num of results = \(searchResults.count)")
//You need to convert to NSManagedObject to use 'for' loops
for trans in searchResults as [NSManagedObject] {
//get the Key Value pairs (although there may be a better way to do that...
print("\(trans.value(forKey: "who")!)")
let mdate = trans.value(forKey: "CheckinDate") as! Date
print(mdate)
}
} catch {
print("Error with request: \(error)")
}
}
func exportDatabase() {
let exportString = createExportString()
saveAndExport(exportString: exportString)
}
func saveAndExport(exportString: String) {
let exportFilePath = NSTemporaryDirectory() + "Checkins.csv"
let exportFileURL = NSURL(fileURLWithPath: exportFilePath)
FileManager.default.createFile(atPath: exportFilePath, contents: NSData() as Data, attributes: nil)
//var fileHandleError: NSError? = nil
var fileHandle: FileHandle? = nil
do {
fileHandle = try FileHandle(forWritingTo: exportFileURL as URL)
} catch {
print("Error with fileHandle")
}
if fileHandle != nil {
fileHandle!.seekToEndOfFile()
let csvData = exportString.data(using: String.Encoding.utf8, allowLossyConversion: false)
fileHandle!.write(csvData!)
fileHandle!.closeFile()
let firstActivityItem = NSURL(fileURLWithPath: exportFilePath)
let activityViewController : UIActivityViewController = UIActivityViewController(
activityItems: [firstActivityItem], applicationActivities: nil)
activityViewController.excludedActivityTypes = [
UIActivity.ActivityType.assignToContact,
UIActivity.ActivityType.saveToCameraRoll,
UIActivity.ActivityType.postToFlickr,
UIActivity.ActivityType.postToVimeo,
UIActivity.ActivityType.postToTencentWeibo
]
self.present(activityViewController, animated: true, completion: nil)
}
}
func createExportString() -> String {
var checkinwho: String?
var checkinreason: String?
var export: String = NSLocalizedString("who, reason, date \n", comment: "")
for (index, itemList) in fetchedStatsArray.enumerated() {
if index <= fetchedStatsArray.count - 1 {
checkinwho = Checkins.value(forKey: "who") as! String?
checkinreason = itemList.value(forKey: "reason") as! String?
let Datevar = Checkins.value(forKey: "date") as! Date
let whostring = checkinwho
let reasonstring = checkinreason
let DateSting = "\(Datevar)"
export += "\(whostring!),\(reasonstring!),\(DateSting) \n"
}
}
print("This is what the app will export: \(export)")
return export
}
Remove the } on this line
#IBOutlet weak var Table_label: UILabel!
}
and put another } at the end of this file.
I wrote the function to lad the records from firebase but there's an error
Escaping closure captures mutating 'self' parameter
The function is written as follows:
let db = Firestore.firestore()
#State var libraryImages: [LibraryImage] = []
mutating func loadImages() {
libraryImages = []
db.collection(K.FStore.CollectionImages.collectionName).getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
if let snapshotDocuments = querySnapshot?.documents {
for document in snapshotDocuments {
let documentData = document.data()
let title: String = documentData[K.FStore.CollectionImages.title] as! String
let thumbnailUrl: String = documentData[K.FStore.CollectionImages.thumbnailUrl] as! String
let svgUrl: String = documentData[K.FStore.CollectionImages.svgUrl] as! String
let libraryImageItem = LibraryImage(title: title, thumbnailUrl: thumbnailUrl, svgUrl: svgUrl)
self.libraryImages.append(libraryImageItem)
}
}
}
}
}
Does anyone know what is causing an error and how to get rid of it?
Move all this into reference type view model and use it as observed object in your view
Here is a demo of possible approach:
struct DemoView: View {
#ObservedObject var vm = ImagesViewModel()
// #StateObject var vm = ImagesViewModel() // << SwiftUI 2.0
var body: some View {
Text("Loaded images: \(vm.libraryImages.count)")
.onAppear {
self.vm.loadImages()
}
}
}
class ImagesViewModel: ObservableObject {
let db = Firestore.firestore()
#Published var libraryImages: [LibraryImage] = []
func loadImages() {
libraryImages = []
db.collection(K.FStore.CollectionImages.collectionName).getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
if let snapshotDocuments = querySnapshot?.documents {
var images = [LibraryImage]()
for document in snapshotDocuments {
let documentData = document.data()
let title: String = documentData[K.FStore.CollectionImages.title] as! String
let thumbnailUrl: String = documentData[K.FStore.CollectionImages.thumbnailUrl] as! String
let svgUrl: String = documentData[K.FStore.CollectionImages.svgUrl] as! String
let libraryImageItem = LibraryImage(title: title, thumbnailUrl: thumbnailUrl, svgUrl: svgUrl)
images.append(libraryImageItem)
}
DispatchQueue.main.async {
self.libraryImages = images
}
}
}
}
}
}
My swift code below when loaded places 3 items in the core data entity named "UserName". When the user enters a number into textfield enterT I want the label labelName to display it. So when the user enters 1 the label should display jessica biel because Jesical Biel is the first name entered. Someone stated the suggestion below to solve this problem. I dont know exactly how to do this.I have added a gif below.
Convert the entered number to Int. If this succeeds pass the integer to joke and fetch the record matching the idx attribute.
https://github.com/redrock34/index-fetch
import UIKit
import CoreData
class ViewController: UIViewController,UITextFieldDelegate {
#IBOutlet var labelName : UILabel!
#IBOutlet var enterT : UITextField!
lazy var context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
override func viewDidLoad() {
super.viewDidLoad()
openDatabse()
fetchData()
enterT.delegate = self
}
func textFieldDidEndEditing(_ textField: UITextField) {
guard let index = Int(textField.text!) else {
// display an alert about invalid text
return
}
joke(at: index - 1)
}
func joke(at index : Int) {
let fetchRequest = NSFetchRequest<Users>(entityName: "Users")
fetchRequest.predicate = NSPredicate(format: "idx == %d", Int32(index))
do {
if let user = try context.fetch(fetchRequest).first {
labelName.text = user.username
}
} catch {
print("Could not fetch \(error) ")
}
}
func openDatabse()
{
let names = ["kim kardashian", "jessica biel", "Hailey Rienhart"]
for i in 0..<names.count {
let newUser = Users(context: context)
newUser.username = names[i]
newUser.idx = Int32(i + 1)
}
print("Storing Data..")
do {
try context.save()
} catch {
print("Storing data Failed", error)
}
}
func fetchData()
{
print("Fetching Data..")
let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Users")
request.returnsObjectsAsFaults = false
do {
let result = try context.fetch(request)
for data in result as! [NSManagedObject] {
let userName = data.value(forKey: "username") as! String
print("User Name is : "+userName)
}
} catch {
print("Fetching data Failed")
}
}}
Of course you have to assign values to the idx attribute and you have to assign the result of the fetch to the label.
First replace
let appDelegate = UIApplication.shared.delegate as! AppDelegate //Singlton instanc
var context:NSManagedObjectContext!
with
lazy var context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
Then replace both openDatabse and saveData with
func openDatabse()
{
let names = ["kim kardashian", "jessica biel", "Hailey Rienhart"]
for i in 0..<names.count {
let newUser = Users(context: context)
newUser.name = names[i]
newUser.idx = Int32(i + 1)
}
print("Storing Data..")
do {
try context.save()
} catch {
print("Storing data Failed", error)
}
}
Finally add a line in joke to display the value
func joke(at index : Int) {
let fetchRequest = NSFetchRequest<Users>(entityName: "Users")
fetchRequest.predicate = NSPredicate(format: "idx == %d", Int32(index))
do {
if let user = try context.fetch(fetchRequest).first {
labelName.text = user.username
}
} catch {
print("Could not fetch \(error) ")
}
}
It creates the records and assigns the proper indexes. Then entering a number in the text field should work.
But – once again – on each launch of the app the 3 records are inserted again with the same names and indexes. Be aware of that!
I want to add strings from an array of dictionary from backend.
but it's always empty outside the fetch function
//fetch data
func fetchFaqs(){
let manager = APIManager()
manager.parsingGet(url: BaseURL.faqs) { (JSON, Status) in
if Status {
let dict = JSON.dictionaryObject
let data = dict!["data"] as! [[String:Any]]
self.faqs = data as! [[String : String]]
}
}
}
//Viewdidload
class FaqViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {
var faqs = [[String:String]]()
var questions = NSMutableArray()
var answers = NSMutableArray()
#IBOutlet var faqsTableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
fetchFaqs()
self.faqsTableView.reloadData()
print(faqs)
// faqsTableView.rowHeight = UITableView.automaticDimension
// faqsTableView.estimatedRowHeight = 600
}
}
Reload the tableview inside the api call closure in Main thread
func fetchFaqs(){
let manager = APIManager()
manager.parsingGet(url: BaseURL.faqs) { (JSON, Status) in
if Status {
let dict = JSON.dictionaryObject
let data = dict!["data"] as! [[String:Any]]
self.faqs = data as! [[String : String]]
DispatchQueue.main.async {
self.faqsTableView.reloadData()
}
}
}
}
How can I save my struct with NSCoding so that it doesn´t change even if the user
closes the app? I would appreciate it if you could also show me how to implement the missing code correctly.
UPDATE with two new functions below:
Here is my code:
struct RandomItems: Codable
{
var items : [String]
var seen = 0
init(items:[String], seen: Int)
{
self.items = items
self.seen = seen
}
init(_ items:[String])
{ self.init(items: items, seen: 0) }
mutating func next() -> String
{
let index = Int(arc4random_uniform(UInt32(items.count - seen)))
let item = items.remove(at:index)
items.append(item)
seen = (seen + 1) % items.count
return item
}
func toPropertyList() -> [String: Any] {
return [
"items": items,
"seen": seen
]
}
}
override func viewWillDisappear(_ animated: Bool) {
UserDefaults.standard.set(try? PropertyListEncoder().encode(quotes), forKey:"quote2")
}
override func viewDidAppear(_ animated: Bool) {
if let data = UserDefaults.standard.value(forKey:"quote2") as? Data {
let quote3 = try? PropertyListDecoder().decode(Array<RandomItems>.self, from: data)
}
}
}
extension QuotesViewController.RandomItems {
init?(propertyList: [String: Any]) {
return nil
}
}
How can I make sure the whole Array is covered here?
For structs you should be using the new Codable protocol. It is available since swift 4 and is highly recommended.
struct RandomItems: Codable
{
var items: [String]
var seen = 0
}
extension RandomItems {
init?(propertyList: [String: Any]) {
...
}
}
// Example usage
let a = RandomItems(items: ["hello"], seen: 2)
let data: Data = try! JSONEncoder().encode(a)
UserDefaults.standard.set(data, forKey: "MyKey") // Save data to disk
// some time passes
let data2: Data = UserDefaults.standard.data(forKey: "MyKey")! // fetch data from disk
let b = try! JSONDecoder().decode(RandomItems.self, from: data2)
Update
It looks like the Original Poster is nesting the struct inside of another class. Here is another example where there struct is nested.
class QuotesViewController: UIViewController {
struct RandomItems: Codable
{
var items: [String]
var seen = 0
}
}
extension QuotesViewController.RandomItems {
init(_ items:[String])
{ self.items = items }
init?(propertyList: [String: Any]) {
guard let items = propertyList["items"] as? [String] else { return nil }
guard let seen = propertyList["seen"] as? Int else { return nil }
self.items = items
self.seen = seen
}
}
// example usage
let a = QuotesViewController.RandomItems(items: ["hello"], seen: 2)
let data: Data = try! JSONEncoder().encode(a)
UserDefaults.standard.set(data, forKey: "MyKey") // Save data to disk
// some time passes
let data2: Data = UserDefaults.standard.data(forKey: "MyKey")! // fetch data from disk
let b = try! JSONDecoder().decode(QuotesViewController.RandomItems.self, from: data2)