從UINavigationController執行ViewController的方法

Question

我在故事板中創建了幾個ViewControllers，每個ViewController都有自己的類文件。在AppDelegate中，我編程生成了一個UINavigationController，它存在於每個頁面的應用程序頂部。這將有兩個按鈕對每個ViewController都是相同的，一個將加載一個名爲'settings'的ViewController，然後一個會觸發一個顯示側面菜單的方法。

屏幕截圖來說明：

目前，每個視圖控制器在左上角的按鈕時，按下移動時穿過露出下面的菜單當前視圖控制器。

這工作正常，但我想要的是這個按鈕被刪除，並用導航控制器上的按鈕（在紫色NavigationController中看到的當前佔位符菜單按鈕）替換。

如何實現在AppDelegate中移動ViewController的代碼，生成了什麼UINavigationController？

AppDelegate.m

@implementation AppDelegate 


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle: nil]; 
    MainViewController* mainVC = [mainStoryboard instantiateInitialViewController]; 
    UINavigationController *navVC = [[UINavigationController alloc] initWithRootViewController:mainVC]; 

    [mainVC setTitle:@"Congress app"]; 

    UIBarButtonItem *showSettingsButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(showSettings:)]; 
    UIBarButtonItem *showMenuButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"menuButton.png"] style:UIBarButtonItemStylePlain target:self action:@selector(revealMenu:)]; 

    mainVC.navigationItem.leftBarButtonItem = showMenuButton; 
    mainVC.navigationItem.rightBarButtonItem = showSettingsButton; 

    [self.window setRootViewController:navVC]; 

    [_window makeKeyAndVisible]; 

    return YES; 
} 
- (IBAction)revealMenu:(id)sender 
{ 
    // This obviously won't work but what should go here instead? 
    // Something like get instance of MainViewController and fire it's reveal menu 
    // method but passing the current ViewController Id and running slidingViewController anchorTopViewTo:ECRight on that? 
    [self.slidingViewController anchorTopViewTo:ECRight]; 
} 

MainViewController.m

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

// Do any additional setup after loading the view. 

    self.view.layer.shadowOpacity = 0.75f; 
    self.view.layer.shadowRadius = 10.0f; 
    self.view.layer.shadowColor = [UIColor blackColor].CGColor; 

    if (![self.slidingViewController.underLeftViewController isKindOfClass:[MenuViewController class]]) { 
     self.slidingViewController.underLeftViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"MenuVC"]; 
    } 

    [self.view addGestureRecognizer:self.slidingViewController.panGesture]; 

    self.menuBtn = [UIButton buttonWithType:UIButtonTypeCustom]; 
    _menuBtn.frame = CGRectMake(8, 80, 34, 24); 
    [_menuBtn setBackgroundImage:[UIImage imageNamed:@"menuButton.png"] forState:UIControlStateNormal]; 
    [_menuBtn addTarget:self action:@selector(revealMenu:) forControlEvents:UIControlEventTouchUpInside]; 

    [self.view addSubview:self.menuBtn]; 
    NSLog(@"MainVC loaded"); 
} 
- (IBAction)revealMenu:(id)sender 
{ 
    [self.slidingViewController anchorTopViewTo:ECRight]; 
} 

Answer 1

你最好不這樣做......

1. 這不是應用程序的委託責任
2. 在github/CocoaControls上有第三方實現，它關閉呃這個和管理導航欄

重做你當前的視圖層次比強制從應用程序委託連接好得多。

• 應用程序委託的責任是響應應用程序級別的事件（如前景/背景通知）。它可能涉及設置初始UI，但除此之外應該基本不做任何事情。