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

SceneDelegate
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。
报错：

-[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;
运行问题解决

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

  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];
  

运行就OK了