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()
}
Related
In the iOS 13 world, I had code like this:
class SceneDelegate: UIResponder, UIWindowSceneDelegate {
func windowScene(_ windowScene: UIWindowScene, userDidAcceptCloudKitShareWith cloudKitShareMetadata: CKShare.Metadata) {
// do stuff with the metadata, eventually call CKAcceptSharesOperation
}
}
I am migrating my app to the new SwiftUI app lifecycle, and can’t figure out where to put this method. It used to live in AppDelegate pre-iOS13, and I tried going back to that, but the AppDelegate version never gets called.
There doesn’t seem to be a SceneDelegateAdaptor akin to UIApplicationDelegateAdaptor available, which would provide a bridge to the old code.
So, I’m lost. How do I accept CloudKit shares with SwiftUI app lifecycle? 🙈
You can still use AppDelegate with SwiftUI's new life-cycle until Apple releases APIs to handle this natively in SwiftUI’s App Life-cycle.
class AppDelegate: NSObject, UIApplicationDelegate {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
return true
}
}
#main
struct MyApp: App {
#UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
var body: some Scene {
WindowGroup {
ContentView()
}
}
}
Read this for more
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()
}
understand iphone has the auto taking photo feature by setting the timer. after this press the shutter button to start.
I want to do something similar. So How to handle the Shutter Button programmatically after the camera has launched.
- implement: UINavigationControllerDelegate, UIImagePickerControllerDelegate
class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
var imagePicker: UIImagePickerController!
}
//-- launch the camera
#IBAction func takePhoto(_ sender: UIButton) {
imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = .camera
present(imagePicker, animated: true, completion: nil)
}
So, after the camera launch, how to programmatically handle the Shutter button like clicking it to take photo?
So, after the camera launch, how to programmatically handle the Shutter button like clicking it to take photo?
Tell the UIImagePickerController to takePicture.
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 navigationController: UINavigationController?
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