一) 項目中使用SceneDelegate

1）使用Main.StoryBoard(Default)

無需特殊處理归薛，Xcode 11及其以上版本，默認生成使用'Main.StoryBoard'模板

2）不使用Main.StoryBoard

2.1）在info.plist文件中找到Storyboard Name鍵值對，將其移除

Storyboard Name

2.2）在Base.lproj文件夾中找到Main.storyboard病袄，將其移除

Main

2.3）在側(cè)邊欄TARGETS下框全，選中General選項卡圾另，找到Deployment Info項代兵，在Status Bar Style選項中,勾選Supports multiple windows選項

Status Bar Style

2.4）在AppDelegate.h文件中浑彰，新增window屬性

@property (strong, nonatomic) UIWindow *window;

2.5）打開SceneDelegate.m文件秽梅，在willConnectToSession代理方法中蓖柔，創(chuàng)建window窗口，初始化rootViewController

- (void)scene:(UIScene *)scene willConnectToSession:(UISceneSession *)session options:(UISceneConnectionOptions *)connectionOptions {
    UIWindowScene *windowScene = (UIWindowScene *)scene;
    self.window = [[UIWindow alloc] initWithWindowScene:windowScene];
    self.window.frame = windowScene.coordinateSpace.bounds;
    self.window.rootViewController = ViewController.new;
    [self.window makeKeyAndVisible];
}

二) 項目中不使用SceneDelegate

1）使用Main.StoryBoard

1.1）在info.plist文件中找到Application Scene Manifest鍵值對风纠，將其移除

Application Scene Manifest

1.2）打開AppDelegate.m文件况鸣，找到UISceneSession lifecycle代理方法，將其全部移除竹观，
即configurationForConnectingSceneSession 和didDiscardSceneSessions兩個方法

#pragma mark - UISceneSession lifecycle
- (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.
}

2）不使用Main.StoryBoard

2.1）在 info.plist 文件中找到 Application Scene Manifest 鍵值對镐捧，將其移除

Application Scene Manifest

2.2）在 info.plist 文件中找到 Main storyboard file base name 鍵值對，將其移除

Main storyboard file base name

2.3）在Base.lproj文件夾中找到Main.storyboard臭增，將其移除

Main

2.4）在AppDelegate.h文件中懂酱，新增window屬性

@property (strong, nonatomic) UIWindow *window;

2.5）打開AppDelegate.m文件，在didFinishLaunchingWithOptions代理方法中誊抛，創(chuàng)建window窗口列牺，初始化rootViewController

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    self.window.backgroundColor = UIColor.whiteColor;
    self.window.rootViewController = UITabBarController.new;
    [self.window makeKeyAndVisible];
    return true;
}