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

SceneDelegate
在Xcode11.0以後創建項目，運行項目出現bug時遇到的問題之一，我的解決方法。
報錯：

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

修改方法：
在AppDelegate.h里加聲明window

@property (nonatomic, strong) UIWindow * window;

運行問題解決

兼容13和13以前的項目AppDelegate和SceneDelegate類方法裏設置
在AppDelegate.m設置

- (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裏設置

    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];
         

運行就OK了