xcode 11新建工程

一. 删除ViewController,Storyboard

1：直接删除Storyboard 和ViewController,不是删索引，是直接移除;

2：info中的plist文件删除Main storyboard file base name选项；

3：在appdelegaet中重新创建window,然后将自己的视图设为根视图然后让gaiwindow现实出来即可。

二. 删除 SceneDelegate

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: 删掉

- (void)application:(UIApplication *)application didDiscardSceneSessions:(NSSet *)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;

5:在-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions里面添加

self.window=[[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];self.window.backgroundColor=[UIColor whiteColor];// ViewController 是你的 rootViewControllerself.window.rootViewController=[[ViewController alloc]init];[self.window makeKeyAndVisible];