I am currently getting a blank screen with Xcode 11, Target iOS 13.0 (the app works fine with all below versions iOS 12.1 till 12.4), I want to make my App work for both iOS users above 12.1 and also 13.0 currently getting blank screen despite adding the below SceneDelegate to my existing project and
adding App Manifest file
import UIKit
import SwiftUI
@available(iOS 13.0, *)
class SceneDelegate: UIResponder, UIWindowSceneDelegate {
var window: UIWindow?
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
//guard let _ = (scene as? UIWindowScene) else { return }
let user = UserDefaults.standard.object(forKey: "defaultsuserid")
let userSelfIdent = UserDefaults.standard.object(forKey: "userinitialident")
if let windowScene = scene as? UIWindowScene {
let internalWindow = UIWindow(windowScene: windowScene)
if (user != nil && userSelfIdent != nil){
let mainstoryboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let newViewcontroller:UIViewController = mainstoryboard.instantiateViewController(withIdentifier: "swrevealviewcontroller") as! SWRevealViewController
internalWindow.rootViewController = newViewcontroller
self.window = internalWindow
internalWindow.makeKeyAndVisible()
}else {
guard let _ = (scene as? UIWindowScene) else { return }
}
}
}
The following is my AppDelegate which is getting called first and executing the didFinishLaunchWithOptions
method. I want to know how can i make this method call only if my Target ios is less than 13.0 and call SceneDelegate method to initialize my rootViewController after 13.0?
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
@available(iOS 13.0, *)
func application(_ application: UIApplication,
configurationForConnecting connectingSceneSession: UISceneSession,
options: UIScene.ConnectionOptions) -> UISceneConfiguration {
return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
}
@available(iOS 13.0, *)
func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
}
@available(iOS 13.0, *)
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
guard let _ = (scene as? UIWindowScene) else { return }
if (user != nil && userSelfIdent != nil){
let mainstoryboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let newViewcontroller:UIViewController = mainstoryboard.instantiateViewController(withIdentifier: "swrevealviewcontroller") as! SWRevealViewController
self.window?.rootViewController = newViewcontroller
}
}
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
Thread.sleep(forTimeInterval: 3.0)
UINavigationBar.appearance().barTintColor = UIColor(red:0.08, green:0.23, blue:0.62, alpha:1.0)
if (user != nil && userSelfIdent != nil){
let mainstoryboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let newViewcontroller:UIViewController = mainstoryboard.instantiateViewController(withIdentifier: "swrevealviewcontroller") as! SWRevealViewController
self.window?.rootViewController = newViewcontroller
}
return true
}
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
let defaultUserID = UserDefaults.standard.string(forKey: "defaultUserID")
}
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
switch (application.applicationState) {
case UIApplicationState.active:
do something
case UIApplicationState.background, UIApplicationState.inactive:
let mainstoryboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let newViewcontroller = mainstoryboard.instantiateViewController(withIdentifier: "swrevealviewcontroller") as! SWRevealViewController
self.window?.rootViewController = newViewcontroller
}
}
I was stuck with this problem, and finally i solved removing the searchDisplayController references from storyboard.
When I had a similar issue it was due to the Single-App template generated using Xcode 11.0 was incompatible to the one being needed for an app built with Xcode 11.2.
So I just created a new Single-Page-App with Xcode 11.2 and copied the generated SceneDelegate to my old project which was created using Xcode 11.0.
After that, the blank screen was gone an my interface visible once more.
So steps to getting to an iOS 13 and lower version
1) Change deployment target to iOS 12.
2) Replace the AppDelegate's methods with what they ought to have for iOS 12 development. Also add this:
3) Remove SceneDelegate.
4) Remove Application Scene Manifest in your info.plist.
It will work on both iOS 13 and lower iOS Version
You have several issues here. It's important to read the documentation related to the app lifecycle which states what is called under iOS 13 and what is called under iOS 12.
You may also want to see my Single View App template that supports iOS 12 and 13.
Looking at your code, here is a summary of the problems:
AppDelegate:
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions)
method should not be in the app delegate.Thread.sleep(forTimeInterval: 3.0)
line. Users want to use your app, not stare at the launch screen longer than necessary. And blocking the main thread on app launch can cause your app to be killed.SceneDelegate:
guard let _ = (scene as? UIWindowScene) else { return }
line, especially since it is inside anif let
that already does that check.I would update your app delegate to be more like this:
Your scene delegate could be like: