I have created custom navigation bar with cart and its count like below code: like this if i call setUpNavigationBar() in all viewcontrollers i am getting navigationbar with cart and count
func setUpNavigationBar(){
self.navigationController?.navigationBar.backgroundColor = CommonColor.navigationColor
self.navigationController?.navigationBar.barTintColor = CommonColor.navigationColor
self.navigationController?.navigationBar.isTranslucent = false
self.navigationController?.navigationBar.layer.masksToBounds = false
let cartBtn: BadgeButton = BadgeButton(type: .custom)
cartBtn.setImage(#imageLiteral(resourceName: "icon55"), for: .normal)
cartBtn.addAction(for: .touchUpInside) {
print("in cart")
let signupVC = (StoryBoard.driver).instantiateViewController(identifier: "ShoppingCartVC") as! ShoppingCartVC
self.navigationController?.pushViewController(signupVC, animated: true)
}
cartBtn.frame = CGRect(x: 0, y: 0, width: 20, height: 20)
let cartQty = UserDefaults.standard.value(forKey: "cartCount")
cartBtn.badgeText = cartQty as? String
let btnCart = UIBarButtonItem(customView: cartBtn)
self.navigationItem.setRightBarButton(btnCart, animated: true)
}
func setBadgeCountForCart(with : String?){
let badge = self.navigationItem.rightBarButtonItems?.map({$0.customView}).filter({$0 is BadgeButton}).first as? BadgeButton
badge?.badgeText = with
}
but in ShoppingCartVC i don't want navigation bar so, i didn't call setUpNavigationBar in ShoppingCartVC viewdidload
so if remove product from cart and i click back button in ShoppingCartVC then the cartConut is not updating in poped viewcontroller
after remove product i have updated cartCount like below:
class ShoppingCartVC: UIViewController {
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(true)
self.navigationController?.navigationBar.isHidden = true
self.serviceCall()
}
func serviceCall(){
self.cartDB = ShoppingCartDetaModel(dictionary: responseData.dict as NSDictionary? ?? NSDictionary())
UserDefaults.standard.set(self.cartDB?.result?.cart?.total_item, forKey: "cartCount")
self.setUpNavigationBar()
}
#IBAction func back(_ sender: UIButton){
self.navigationController?.navigationBar.isHidden = false
self.serviceCall()
UserDefaults.standard.set(self.cartDB?.result?.cart?.total_item, forKey: "cartCount")
self.setUpNavigationBar()
self.navigationController?.popViewController(animated: true)
}
}
where should i change, please do help
You need to update the BadgeButton its text property with the updated quantity after you navigated back. You can use different methods for achieving that. The easiest and less clean one is to call self.setUpNavigationBar() in the viewWillAppear method. A cleaner way is to use the NotificationCenter class or a Publisher and post an update every time the quantity changes.
ViewWillAppear: https://developer.apple.com/documentation/uikit/uiviewcontroller/1621510-viewwillappear
NotificationCenter: https://developer.apple.com/documentation/foundation/notificationcenter
Publisher: https://developer.apple.com/documentation/combine/publisher
Related
Similar like iPhone phoneBook, I want make view like VC(tableView) -> Modal -> navigationView. But I'm having some problems:
//vc(tableView)
#objc func addBtnClick(sender: UIButton){
let childVC = InformationView()
let fakeRootView = UINavigationController(rootViewController: childVC)
self.present(fakeRootView, animated: true){
print("rootView CompletionHandler")
}
Then save infomation in InformationView using realm:
#objc
func saveBtnClick(sender: UIButton){
content.phoneName = self.nameField.text!
content.phoneNum = self.phoneNumber.text!
try! realm.write {
realm.add(content, update: .all)
}
print(Realm.Configuration.defaultConfiguration.fileURL!)
table.tableView.reloadData()
self.presentingViewController?.dismiss(animated: true)
navInfoViewLoad()
func navInfoViewLoad(){
let childVC = contentView
self.navigationController?.pushViewController(childVC, animated: true)
}
After pressing saveBtnClick, I want to move to contentView. But I am getting an error:
Thread 1: Pushing a navigation controller is not supported
What is the problem?
I am using MVVM+C pattern to build my app. Currently I am facing a problem with changing the native back button title and image of navigation bar to the custom image without the title. I've tried a lots of solutions what I was able to find, but nothing set the different title or even an image. I've ended up with this code in AppDelegate.swift:
let navigationController: UINavigationController = .init()
if #available(iOS 13.0, *) {
let appearence = UINavigationBarAppearance()
appearence.configureWithOpaqueBackground()
appearence.backgroundColor = .backgroundColor
appearence.shadowColor = nil
appearence.shadowImage = nil
navigationController.navigationBar.standardAppearance = appearence
navigationController.navigationBar.scrollEdgeAppearance = navigationController.navigationBar.standardAppearance
} else {
navigationController.navigationBar.isTranslucent = false
navigationController.navigationBar.barTintColor = .backgroundColor
navigationController.navigationBar.shadowImage = nil
navigationController.navigationBar.shadowColor = nil
}
// This code is not working at all, always get "Back" as a default with default image =====
let backButtonBackgroundImage = UIImage(named: "backButton")
navigationController.navigationBar.backIndicatorImage = backButtonBackgroundImage
navigationController.navigationBar.backIndicatorTransitionMaskImage = backButtonBackgroundImage
let backBarButtton = UIBarButtonItem(title: "", style: .plain, target: nil, action: nil)
navigationController.navigationItem.backBarButtonItem = backBarButtton
// =========
navigationController.navigationBar.tintColor = .primary
window?.rootViewController = navigationController
window?.makeKeyAndVisible()
Also, I've followed the official documentation but without any success. As default I've set the navigation bar as hidden (because is not needed for multiple times) and I am showing it in ViewWillAppear and hiding in ViewWillDisappear methods.
Is there someone who has an idea of what's going on? Thanks!
The result of this code:
Expected result:
This is what I get with the new code:
SOLUTION:
After using code from Scott I was able to change the image and look of the navigation bar but I lost the ability to swipe back. After adding this code to the UINavigationBar extension I was able to get it back:
extension UINavigationController: UIGestureRecognizerDelegate {
#objc func goBack(sender: Any?) {
self.popViewController(animated: true)
}
override open func viewDidLoad() {
super.viewDidLoad()
interactivePopGestureRecognizer?.delegate = self
}
public func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
return viewControllers.count > 1
}
}
Below is some Playground code that shows a UINavigationController with a custom back button that is an image.
Note that what it does is hides the system provided back button, then substitutes another button that still performs the "back" action but on a custom UINavigationController.
There may be a more efficient way to duplicate the functionality of "back" that doesn't involve a custom class and a custom target-action setup, but I couldn't find one quickly so finding that solution can be left as an exercise for the reader.
import UIKit
import SwiftUI
import PlaygroundSupport
NSSetUncaughtExceptionHandler { error in
debugPrint(error)
}
class MyNavController : UINavigationController {
#objc func goBack(sender: Any?) {
self.popViewController(animated: true)
}
}
let navDestination1 = UIViewController()
navDestination1.navigationItem.title = "Destination 1"
let navigationController = MyNavController(rootViewController: navDestination1)
if #available(iOS 13.0, *) {
let appearence = UINavigationBarAppearance()
appearence.configureWithOpaqueBackground()
appearence.backgroundColor = .purple
appearence.shadowColor = nil
appearence.shadowImage = nil
navigationController.navigationBar.standardAppearance = appearence
navigationController.navigationBar.scrollEdgeAppearance = navigationController.navigationBar.standardAppearance
} else {
navigationController.navigationBar.isTranslucent = false
navigationController.navigationBar.barTintColor = .purple
navigationController.navigationBar.shadowImage = nil
}
let navDestination2 = UITableViewController()
navDestination2.navigationItem.title = "Destination 2"
navDestination2.navigationItem.hidesBackButton = true
navDestination2.navigationItem.leftBarButtonItem = UIBarButtonItem(
image: UIImage(systemName: "multiply.circle.fill"),
style: UIBarButtonItem.Style.done,
target: navigationController,
action: #selector(MyNavController.goBack))
navigationController.pushViewController(navDestination2, animated: true)
navigationController.view.bounds = CGRect(x: 0,y: 0,width: 320,height: 480)
PlaygroundSupport.PlaygroundPage.current.liveView = navigationController
I am making an app that will display a random quote from a stoic philosopher. Right now, I am stuck on trying to make the correct picture pop up. (User clicks on a Button with the philosopher's name on it, and then a new view pops up with an image of the philosopher and a random quote by him).
class ViewController: UIViewController {
var allQuotes = [String]()
var pictures = [String]()
#IBOutlet var Epictetus: UIButton!
#IBOutlet var Seneca: UIButton!
#IBOutlet var MarcusAurelius: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
// Create a constant fm and assign it the value returned by FileManager.default (built in system type)
let fm = FileManager.default
// Declares a new constant called path that sets the resource path of ours apps buddle.
// A bundle is a directory containing our compiled program and all our assets
let path = Bundle.main.resourcePath!
// items array will be a constant collection of the names of all the files found in the directory of our app
let items = try! fm.contentsOfDirectory(atPath: path)
// create a loop to go through all of our items...
for item in items {
if item.hasSuffix("jpg"){
pictures.append(item)
}
}
print(pictures)
title = "Stoicism"
if let stoicQuotesURL = Bundle.main.url(forResource: "quotes", withExtension: "txt"){
if let stoicQuotes = try? String(contentsOf: stoicQuotesURL) {
allQuotes = stoicQuotes.components(separatedBy: "\n\n")
}
}
}
#IBAction func buttonTapped(_ sender: UIButton) {
if sender.tag == 0 {
if let vc = storyboard?.instantiateViewController(identifier: "Picture") as? PictureViewController {
vc.selectedImage = pictures[0]
navigationController?.pushViewController(vc, animated: true)
}
}
else if sender.tag == 1 {
if let vc = storyboard?.instantiateViewController(identifier: "Picture") as? PictureViewController {
vc.selectedImage = pictures[1]
navigationController?.pushViewController(vc, animated: true)
}
}
else if sender.tag == 2 {
if let vc = storyboard?.instantiateViewController(identifier: "Picture") as? PictureViewController {
vc.selectedImage = pictures[2]
navigationController?.pushViewController(vc, animated: true)
}
}
}
}
That's the code for my main viewController.
import UIKit
class PictureViewController: UIViewController {
#IBOutlet var picture: UIImageView!
#IBOutlet var imageView: UIImageView!
var selectedImage: String?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
if let imageToLoad = selectedImage {
imageView.image = UIImage(named: imageToLoad)
}
}
override func viewWillAppear(_ animated: Bool) {
// doing it for the parent class
super.viewWillAppear(animated)
// if its a nav Cont then it will hide bars on tap...
}
// now make sure it turns off when you go back to the main screen
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destination.
// Pass the selected object to the new view controller.
}
*/
}
That's the code for the viewController that has the imageView. Right now, the image that's popping up is always the preset (Marcus Aurelius), even though my code looks correct to me. Obviously it isn't (also, I've already debugged and ensured through print statements that the jpg files add to the pictures array correctly).
Any help would be appreciated.
First of all, this code is really silly:
#IBAction func buttonTapped(_ sender: UIButton) {
if sender.tag == 0 {
if let vc = storyboard?.instantiateViewController(identifier: "Picture") as? PictureViewController {
vc.selectedImage = pictures[0]
navigationController?.pushViewController(vc, animated: true)
}
}
else if sender.tag == 1 {
if let vc = storyboard?.instantiateViewController(identifier: "Picture") as? PictureViewController {
vc.selectedImage = pictures[1]
navigationController?.pushViewController(vc, animated: true)
}
}
else if sender.tag == 2 {
if let vc = storyboard?.instantiateViewController(identifier: "Picture") as? PictureViewController {
vc.selectedImage = pictures[2]
navigationController?.pushViewController(vc, animated: true)
}
}
}
Do you see that everything in those lines is identical except for the numbers? So make the number a variable:
#IBAction func buttonTapped(_ sender: UIButton) {
if let vc = storyboard?.instantiateViewController(identifier: "Picture") as? PictureViewController {
print(sender.tag)
vc.selectedImage = pictures[sender.tag]
navigationController?.pushViewController(vc, animated: true)
}
}
See how much shorter and clearer that is? Okay, I've also added a print statement. This will print the tag to the console. You need to make sure that your buttons do have the right tags. If they do, your code should work.
Good day everyone,
I have root view controller set up as my HomeViewController, in this project i am using token based authentication ( which i am storing in user defaults ) and i am using token for all my API calls.
I have a check in my viewWillAppear method to check if there is access token present and then i make the api call in viewDidAppear to populate the collection view, and this works perfectly fine at all times except the first time.
If I log in for the first time it hits the viewWillAppear, viewDidAppear and then login screen pops up and once i authenticate the user and save it in the UserDefaults, dismiss the login screen and in the HomeViewController all i get is a spinner ( which means that viewDidAppear is also been called ) but if i close the app and open it again it all works fine.
What can i change in my code to make it work in the first time please and thank you!!
class HomeViewController: UIViewController {
// MARK: - Properties
let refreshControl = UIRefreshControl()
var publishedReportList: [ReportListDetail] = []
private let reportsCollectionView: UICollectionView = {
let viewLayout = UICollectionViewFlowLayout()
let collectionView = UICollectionView(frame: .zero, collectionViewLayout: viewLayout)
collectionView.register(ReportsCollectionViewCell.self, forCellWithReuseIdentifier: ReportsCollectionViewCell.identifier)
collectionView.backgroundColor = .systemBackground
return collectionView
}()
// MARK: - Initialisation
override func viewDidLoad() {
super.viewDidLoad()
reportsCollectionView.delegate = self
reportsCollectionView.dataSource = self
print(publishedReportList.count)
refreshControl.tintColor = .blue
refreshControl.addTarget(self, action: #selector(pullToRefresh), for: .valueChanged)
reportsCollectionView.addSubview(refreshControl)
reportsCollectionView.alwaysBounceVertical = true
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// check auth status
handleNotAuthenticated()
}
override func viewDidAppear(_ animated: Bool) {
// call for reports
getReportUserLayout()
}
// MARK: - Handlers
#objc func pullToRefresh() {
// Code to refresh table view
getReportUserLayout()
}
fileprivate func getReportUserLayout() {
// publishedReportList.removeAll()
whySuchEmptyLabel.isHidden = true
spinner.show(in: view)
spinner.textLabel.text = "Loading Reports.."
DispatchQueue.main.async {
ReportsManager.shared.getReportData { [weak self] (listOfReports) in
guard let strongSelf = self else { return }
strongSelf.publishedReportList = listOfReports
if listOfReports.count == 0 {
strongSelf.whySuchEmptyLabel.isHidden = false
}
strongSelf.reportsCollectionView.reloadData()
strongSelf.spinner.dismiss()
strongSelf.refreshControl.endRefreshing()
}
}
}
private func handleNotAuthenticated() {
if UserDefaults.standard.string(forKey: "accessToken") == nil {
// show login view controller
let loginVC = LoginViewController()
loginVC.modalPresentationStyle = .overCurrentContext
present(loginVC, animated: false)
}
}
}
You are in the HomeViewController and presenting loginVC, so it will not trigger viewDidAppear or viewWillAppear because it is not disappeared from the app. You have to use closure or delegate or notification to communicate back to the HomeViewController. You can also use the Combine framework and save the state. Here is an example of using delegate.
// Add protocol
protocol ViewControllerDelegate {
func loggedIn()
}
class HomeViewController: UIViewController, ViewControllerDelegate {
private func handleNotAuthenticated() {
if UserDefaults.standard.string(forKey: "accessToken") == nil {
let loginVC = LoginViewController()
loginVC.modalPresentationStyle = .overCurrentContext
loginVC.viewDelegate = self
present(loginVC, animated: false)
}
}
}
class LoginViewController: UIViewController {
var viewDelegate: ViewControllerDelegate? = nil
func userLoggedIn() {
self.viewDelegate?.loggedIn()
}
}
I would like to pass data from EditPostViewController to NewsfeedTableViewController using delegates, but func remove(mediaItem:_) is never called in the adopting class NewsfeedTableViewController. What am I doing wrong?
NewsfeedTableViewController: UITableViewController, EditPostViewControllerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
//set ourselves as the delegate
let editPostVC = storyboard?.instantiateViewController(withIdentifier: "EditPostViewController") as! EditPostViewController
editPostVC.delegate = self
}
//remove the row so that we can load a new one with the updated data
func remove(mediaItem: Media) {
print("media is received heeeee")
// it does't print anything
}
}
extension NewsfeedTableViewController {
//when edit button is touched, send the corresponding Media to EditPostViewController
func editPost(cell: MediaTableViewCell) {
let editPostVC = storyboard?.instantiateViewController(withIdentifier: "EditPostViewController") as? EditPostViewController
guard let indexPath = tableView.indexPath(for: cell) else {
print("indexpath was not received")
return}
editPostVC?.currentUser = currentUser
editPostVC?.mediaReceived = cell.mediaObject
self.navigationController?.pushViewController(editPostVC!, animated: true)
}
protocol EditPostViewControllerDelegate: class {
func remove(mediaItem: Media)
}
class EditPostViewController: UITableViewController {
weak var delegate: EditPostViewControllerDelegate?
#IBAction func uploadDidTap(_ sender: Any) {
let mediaReceived = Media()
delegate?.remove(mediaItem: mediaReceived)
}
}
The objects instantiating in viewDidLoad(:) and on edit button click event are not the same objects. Make a variable
var editPostVC: EditPostViewController?
instantiate in in viewDidLoad(:) with delegate
editPostVC = storyboard?.instantiateViewController(withIdentifier: "EditPostViewController") as! EditPostViewController
editPostVC.delegate = self
and then present it on click event
navigationController?.pushViewController(editPostVC, animated: true)
or
present(editPostVC, animated: true, completion: nil)
you can pass data from presenter to presented VC before or after presenting the VC.
editPostVC.data = self.data
I suggest having a property in NewsfeedTableViewController
var editPostViewController: EditPostViewController?
and then assigning to that when you instantiate the EditPostViewController.
The idea is that it stops the class being autoreleased when NewsfeedTableViewController.viewDidLoad returns.