Xcode11前后自定义窗口

Xcode11前

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    
    //Xcode11前生效
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.backgroundColor = [UIColor whiteColor];
    UIViewController *vC = [[CustomViewController alloc] init];
    self.window.rootViewController = vC;
    //window核心化可见
    [self.window makeKeyAndVisible];
    return YES;
}

Xcode11后

- (void)scene:(UIScene *)scene willConnectToSession:(UISceneSession *)session options:(UISceneConnectionOptions *)connectionOptions  API_AVAILABLE(ios(13.0)) API_AVAILABLE(ios(13.0)) API_AVAILABLE(ios(13.0)){
    
    
    //Xcode11后生效
    //scene行参字段名表象特征结构为UIScene*但持有的实例值的实际特征结构为UIWindowScene*
    //强制类型转化
    if (@available(iOS 13.0, *)) {
    
    
        UIWindowScene *windowScene = (UIWindowScene *)scene;
        self.window = [[UIWindow alloc] initWithWindowScene:windowScene];
    } else {
    
    
        self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    }
    self.window.backgroundColor = [UIColor whiteColor];
    UIViewController *vC = [[CustomViewController alloc] init];
    self.window.rootViewController = vC;
    //window核心化可见
    [self.window makeKeyAndVisible];
}