1: 到info.plist刪除Application Scene Manifest選項；
2: 刪掉Scenedelegate.h和Scenedelegate.m這兩個文件;
3: AppDelegate里刪掉
- (void)application:(UIApplication *)application didDiscardSceneSessions:(NSSet<UISceneSession *> *)sceneSessions {}
- (UISceneConfiguration *)application:(UIApplication *)application configurationForConnectingSceneSession:(UISceneSession *)connectingSceneSession options:(UISceneConnectionOptions *)options {}
4: 在APPdelegate.h里面添加window屬性
@property (strong, nonatomic) UIWindow * window;
運行
