iOS13 设置rootviewcontroller

原文链接

在Xcode11.0以后创建项目，运行项目出现bug时遇到的问题之一，我的解决方法。

-[AppDelegate setWindow:]: unrecognized selector sent to instance 0x60000002b440

修改方法：
在AppDelegate.h里加声明window

@property (nonatomic, strong) UIWindow * window;

兼容13和13以前的项目AppDelegate和SceneDelegate类方法里设置
在AppDelegate.m设置

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    if (@available(iOS 13.0, *)) {
  
    } else {
      
        self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
        self.window.rootViewController = [[UITabBarController alloc]init];
        self.window.backgroundColor = [UIColor whiteColor];
        [self.window makeKeyAndVisible];
        
    }
    return YES;
}

在SceneDelegate.m里设置

- (void)scene:(UIScene *)scene willConnectToSession:(UISceneSession *)session options:(UISceneConnectionOptions *)connectionOptions {
    // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
    // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
    // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
          UIWindowScene *windowScene = (UIWindowScene *)scene;
          self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
          self.window = [[UIWindow alloc] initWithWindowScene:windowScene];
          [self.window setWindowScene:windowScene];
          [self.window setBackgroundColor:[UIColor whiteColor]];
          [self.window setRootViewController:[UITabBarController new]];
          
          [self.window makeKeyAndVisible];
}

补充
获取window

if (@available(iOS 13.0, *)) {
        window = [UIApplication sharedApplication].windows[0];
    } else {
        window = [UIApplication sharedApplication].delegate.window;
    }