In swift 5 and UIKit on clicking apns I have been pushing to the desired view controller by fetching the top view controller and push the desired view controller over top view controller.
But in SwiftUI I am not able to do that. How can I navigate from apns in SwiftUI.
I don't have to set desired controller as window root controller. I want to push the desired controller over the top view controller. I just want to push to a controller from apns click.
I am getting apns click in this delegate method:
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: #escaping () -> Void) {
}
You can add your own method in SceneDelegate. Create SceneDelegate object set its window rootViewController as follows.
extension SceneDelegate{
func loginViewController() {
let loginView = LoginView()
let sceneDelegate = UIApplication.shared.connectedScenes.first?.delegate as?
SceneDelegate
sceneDelegate?.window?.rootViewController = UIHostingController(rootView:
loginView)
}
}
And call method like this:
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: #escaping () -> Void) {
//Call method here
let sceneDelegate = UIApplication.shared.connectedScenes.first?.delegate as? SceneDelegate
sceneDelegate?.loginViewController()
}
Related
I'm showing a fullScreenCover with SwiftUI. Under certain flows, I want to dismiss the cover and show another from the Root ContentView. When I call
#Environment(\.dismiss) var dismiss
Button {
dismiss()
NotificationCenter.default.post(name: NSNotification.showNewScreen, object: nil, userInfo: nil)
} label: {
Text("This is a test")
}
I get the error:
[Presentation] Attempt to present xxx from yyy which is already presenting zzz
UIKit had the helpful completion handler so I could wait until the ViewController was dismissed before adding logic:
func dismiss(
animated flag: Bool,
completion: (() -> Void)? = nil
)
Is there something similar with SwiftUI? My current workaround is to add a delay to avoid presenting on the same view... which feels wrong.
DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) {
NotificationCenter.default.post(name: NSNotification.showNewScreen, object: nil, userInfo: nil)
}
It's not pretty to mess with modals in this way, but if you want to present the next modal from the presenting view then you can pass a binding isPresented and use the onDismiss argument for the fullScreenCover view modifier:
.fullScreenCover(isPresented: $isPresented, onDismiss: DispatchQueue.main.async { presentNextThingy }) { firstThingyContent }
or my preference use a binding that when changed will dismiss and load the next modal view, if needed. This allows the first view to determine what is presented when it is dismissed by changing the binding directly.
.fullScreenCover(item: $thingyBeingPresented) { thingy in
content(for: Thingy)
}
How do I handle this method in new SwiftUI app lifecycle?
I am looking at the Scene but it does not have any info about SceneDelegate methods
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) { method in SwiftUI new App cycle.
You can get notified when a device receives a specific notification using .onReceive modifier.
for your case, you can use .onReceive like this on top of one of your view(s) to get notified for scene connections:
.onReceive(NotificationCenter.default.publisher(for: UIScene.willConnectNotification)) { notification in
}
You can get notification through userNotificationCenter even when the app is not running and is launched from the notification.
func userNotificationCenter(_ center: UNUserNotificationCenter,
didReceive response: UNNotificationResponse,
withCompletionHandler completionHandler: #escaping () -> Void) {
print("open notification")
let userInfo = response.notification.request.content.userInfo
print(userInfo)
completionHandler()
}
In a Swift 3 project using Xcode 8.3 and iOS 10.3, I get a navigation controller to push. The app runs with a navigation controller until I try to use it to push. All works until the last line which cause an app crash, fatal error: unexpectedly found nil while unwrapping an Optional value. I don't want to use the storyboard, the point of this question is how to accomplish this task without the storyboard.
App Delegate code
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
window = UIWindow(frame: UIScreen.main.bounds)
window?.makeKeyAndVisible()
window?.rootViewController = UINavigationController(rootViewController: MainViewController())
}
View Controller:
import UIKit
class MainViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
let navController = navigationController
let myProfileViewController = MyProfileViewController()
navController!.pushViewController(myProfileViewController, animated: true)
}
}
Move
let navController = navigationController
let myProfileViewController = MyProfileViewController()
navController!.pushViewController(myProfileViewController, animated: true)
from viewDidLoad to viewDidAppear.
In viewDidLoad there is no parent navigation controller set up and you should not start animations from there.
You can add navigation controller in storyboard,
in Storyboard click on MainViewController & from editor menu add navigation controller & push via navigation controller as below code.
let vc = self.storyboard?.instantiateViewController(withIdentifier: "MyProfileViewController") as! MyProfileViewController
self.navigationController?.pushViewController(vc, animated: true)
Make sure storyboard identifier is correct. & remove navigation controller code form AppDelegate class.
first give name to your navigation controller like this
then in your code initialise it like this
let nav = (UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "yourNavigation") as! UINavigationController);
nav.pushFrontViewController(MainViewController(), animated: true);
window?.rootViewController = nav
I'm working on an existing application which uses the storyboard but I want to continue development without using the storyboard at all, or nib files.
The existing left menu is a UITableView which is not the root controller and does not have a navigation controller associated with it. I have created a UINavigationController in the app delegate and want to use this navigation controller to push a new controller. I am able to present a view controller but I want to use push in order to conform with the current UIX.
In the following code nothing happens because navigationController? returns nil.
Here is my new code in the app delegate.
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
var navController: UINavigationController?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
navController = UINavigationController()
self.window = UIWindow(frame: UIScreen.main.bounds)
self.window!.rootViewController = navController
self.window!.backgroundColor = .red
self.window!.makeKeyAndVisible()
let menuViewController = SideMenuViewController()
menuViewController.navController = navController
Then in my side menu controller:
import UIKit
class SideMenuViewController: UIViewController {
var navController: UINavigationController?
.......
let myViewController = myViewController()
self.navigationController?.pushViewController(myViewController, animated: true )
From the UIViewController documentation:
var navigation​Controller:​ UINavigation​Controller?
The nearest
ancestor in the view controller hierarchy that is a navigation
controller.
Which means when you call self.navigationController in a view controller you get the (nearest) navigation controller that self is embedded in. Apparently your menu controller is not embedded in the navigation controller hierarchy. Using your app delegate's navController member is one way to make this work. Then you can say in your menu view controller:
func menuItemFooSelected()
{
let navController = (UIApplication.shared.delegate as! AppDelegate).navController
let myViewController = myViewController()
navController?.pushViewController(myViewController, animated: true)
}
Alternatively (and probably preferably), when you set up your initial structure in your app delegate, inject the navigation controller into the side menu controller:
class MenuViewController: UIViewController
{
var navController: UINavigationController?
...
func menuItemFooSelected()
{
let myViewController = myViewController()
self.navController?.pushViewController(myViewController, animated: true)
}
}
In application(_:didFinishLaunchingWithOptions:)
...
let menuViewController = MenuViewController(...)
menuViewController.navController = navController
I have 2 view controllers on my storyboard: viewController1(it input point) and viewController2. After loading the application i want to automatic presenting viewController2 after viewController1.
How i can do that?
if you want to go to second viewcontroller you can add this code to you viewDidLoad method:
let secondViewController = self.storyboard?.instantiateViewController(withIdentifier: "yourIdentifier") as! secondViewController
self.navigationController?.pushViewController(secondViewController, animated: true)
remeber to add a identifier for the second viewcontroller in storyboard and chenge the identifier that you use with "yourIdentifier"
if you don't want a animation put the animated: true to false.
if you dont want to show the fist viewcontroller, go into you storyboard and click on the second viewcontroller, then in the right side on attributes inspector select the box int the image:
For change viewcontroller you have to embed the first viewcontroller with a navigation controller, if you don't know how to do it, just select the fisrt viewcontroller and do like the image, click in navigation controller
Have you tried to show it in func viewDidLoad() {} like:
override func viewDidLoad() {
// ...
self.present(viewController, animated: true, completion: nil)
}
If you want to straight up load a different view controller you can do this in your app delegate:
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewController(withIdentifier: "put your identifier here")
self.window?.rootViewController = vc
return true
}