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起動時に表示する ViewController を動的に変更する

Posted at

ViewController に Storyboard ID を設定する

storyboard 中の表示したい ViewController に Storyboard ID を設定する。

AppDelegate 内で読み出す

初回起動時や特定の条件によって表示する ViewController を指定します。下の例は初回起動時に表示画面を切り替える例。

AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    ...

    self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];

    bool isFirst = NO;
	// 初回起動かどうかを判定する処理
	...

    // ここで表示したい ViewController を指定する
	UIViewController *viewController;
	if(isFirst){
    	viewController = [storyboard instantiateViewControllerWithIdentifier@"initial view controller storyboard id"];
	}else{
    	viewController = [storyboard instantiateViewControllerWithIdentifier@"main view controller storyboard id"];
	}

    self.window.rootViewController = viewController;
    [self.window makeKeyAndVisible];

    return YES;
}

おまけ

別の Storyboard にある ViewController に遷移する

1つの Storyboard で全画面遷移を記述すると大変なので複数の Storyboard に分けて開発することも可能です。

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard2" bundle:nil];
    id firstViewController = [storyboard instantiateInitialViewController];
    [self presentViewController:(UIViewController *)firstViewController animated:NO completion:nil];
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