1: 到info.plist删除Application Scene Manifest选项；
2: 删掉Scenedelegate.h和Scenedelegate.m这两个文件;
3: AppDelegate里删掉
- (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属性
@property (strong, nonatomic) UIWindow * window;
运行
