自xcode11新增SceneDelegate后，SceneDelegate與Man.storyboard該如何處理：

1. 第一種情況，刪除SceneDelegate，但保留Man.storyboard：

• 刪除info.plist中的Application Scene Manifest一項
• 在AppDelegate.h中添加window屬性@property (strong, nonatomic) UIWindow *window;
• 刪除AppDelegate.m中新增的兩個UIScene方法
• 刪除UISceneDelegate類文件
  切記要在AppDelegate.h中添加window屬性，否則Man.storyboard無法正常加載

2. 第二種情況，刪除SceneDelegate且刪除Man.storyboard：

• 刪除info.plist中的Application Scene Manifest一項
• 在AppDelegate.h中添加window屬性@property (strong, nonatomic) UIWindow *window;
• 刪除AppDelegate.m中新增的兩個UIScene方法
• 刪除UISceneDelegate類文件

• 刪除Main.storeboaard文件
• 項目TARGETS->General->Main Interface置為空
• 刪除info.plist中Main storyboard file base name一項
• AppDelegate.m中導入目標頭文件，在didFinishLaunchingWithOptions方法中添加目標類：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    self.window = [[UIWindow alloc] init];
    self.window.frame = [UIScreen mainScreen].bounds;
    self.window.backgroundColor = [UIColor whiteColor];

    ViewController * vc = [[ViewController alloc]init];
    self.window.rootViewController = vc;
    [self.window makeKeyAndVisible];
    return YES;
}

3. 第三種情況，保留SceneDelegate但刪除Man.storyboard：

• 項目TARGETS->General->Main Interface置為空
• 刪除info.plist中Main storyboard file base name一項
• 刪除info.plist中Application Scene Manifest -> Scene Configuration -> Application Scene Role -> Item 0 -> Storyboard name一項
• SceneDelegate.m中導入目標頭文件，在willConnectToSession方法中添加目標類：

- (void)scene:(UIScene *)scene willConnectToSession:(UISceneSession *)session options:(UISceneConnectionOptions *)connectionOptions {
    if ([scene isKindOfClass:[UIWindowScene class]]) {
        UIWindowScene *windowScene = (UIWindowScene*)scene;
        self.window = [[UIWindow alloc] initWithWindowScene:windowScene];
        self.window.frame = [UIScreen mainScreen].bounds;
        self.window.backgroundColor = [UIColor whiteColor];

        ViewController * vc = [[ViewController alloc]init];
        self.window.rootViewController = vc;
        [self.window makeKeyAndVisible];
    }
    
}