iOS開發手記 - iOS9.3 UINavigationController添加後不顯示storyboard中viewcontroller裡的控制項的解決方案

標籤：

我原先是這麼做的，通常也是這麼做

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    // Override point for customization after application launch.    ViewController *firstVC = [[ViewController alloc] init];    UINavigationController *naviController = [[UINavigationController alloc] initWithRootViewController:firstVC];    self.window.rootViewController = naviController;    self.window.backgroundColor = [UIColor whiteColor];    [self.window makeKeyAndVisible];    return YES;} 

 然而運行後，UINavigationController的確作為windows的根視圖顯示了，但是firstVC裡的控制項卻沒有顯示，一片空白

事實證明不能這樣直接alloc firstVC，而是要從storyboard中載入，我改成如下就行了：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    // Override point for customization after application launch.    UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Main_" bundle:nil];    ViewController *firstVC = [storyBoard instantiateViewControllerWithIdentifier:@"MainView"];    UINavigationController *naviController = [[UINavigationController alloc] initWithRootViewController:firstVC];    self.window.rootViewController = naviController;    self.window.backgroundColor = [UIColor whiteColor];    [self.window makeKeyAndVisible];    return YES;}

我查看過很多代碼例子都是像前者一樣直接alloc載入就可以，但是我這裡卻不行，一定要這樣從storyboard中載入，我哪裡沒注意到望大神告知

iOS開發手記 - iOS9.3 UINavigationController添加後不顯示storyboard中viewcontroller裡的控制項的解決方案