翻阅苹果官方文档说
n iOS 13 and later, use UISceneDelegate objects to respond to life-cycle events in a scene-based app.
这个场景呢，如果不使用ipad的多窗口就不建议使用
1.首先我们去到info.plist，删掉如下图箭头所示
2.项目目录，删掉Scenedelegate.h和Scenedelegate.m这两个文件。
3.咱们再进入APPdelegate.m,注释或者删掉图示里面内容
- (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.
}
4.最后一步，别忘了在APPdelegate.h里面添加window属性
@property (strong, nonatomic) UIWindow * window;
