禁用SceneDelegate

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首先删除 SceneDelegate.h 和 SceneDelegate.m ,info.plist中的 Application Scene Manifest 和 AppDelegate.m 中的

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#pragma mark - UISceneSession lifecycle

- (UISceneConfiguration *)application:(UIApplication *)application configurationForConnectingSceneSession:(UISceneSession *)connectingSceneSession options:(UISceneConnectionOptions *)options {
    // Called when a new scene session is being created.
    // Use this method to select a configuration to create the new scene with.
    return [[UISceneConfiguration alloc] initWithName:@"Default Configuration" sessionRole:connectingSceneSession.role];
}

- (void)application:(UIApplication *)application didDiscardSceneSessions:(NSSet<UISceneSession *> *)sceneSessions {
    // Called when the user discards a scene session.
    // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
    // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
}

接着在 AppDelegate.h 和 AppDelegate.m 中增加

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@property (strong, nonatomic) UIWindow * window;

如果需要自己创建 window 按照原来的方法创建即可，不创建的话也可以使用 Main.storyboard

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- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

	
    self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyWindow];
    [self.window makeKeyAndVisible];
    return YES;

}