ios - 关于NavigationController的一个问题。

Question

以下是我的AppDelegate.m代码

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    MenuViewController *leftVC = [[MenuViewController alloc] init];
    StatusViewController *plainVC = [[StatusViewController alloc] init];
    ICSDrawerController *drawer = [[ICSDrawerController alloc] initWithLeftViewController: leftVC centerViewController: plainVC];
    
    self.window.rootViewController = drawer;
    navController = [[UINavigationController alloc] initWithRootViewController: drawer];
    [self.window makeKeyAndVisible];
    
    return YES;
}

其中，ICSDrawerController中包括两个成员MenuViewController和StatusController。在StatusController.m中，我想令其在触发按钮后跳转进入另外一个界面，部分代码如下：

- (IBAction) startToRunning: (id)sender {
    NSLog (@"hello");
    RunningViewController *RVC = [[RunningViewController alloc] init];
    [self.navigationController pushViewController: RVC animated: true];
    NSLog(@"%@", self.navigationController);
}

在实测中的console输出：

2016-01-18 11:00:18.043 SunnySports[11582:1035035] hello
2016-01-18 11:00:18.043 SunnySports[11582:1035035] <UINavigationController: 0x7fc71181da00>

但是，界面却无法跳转。求助！！

Answer 1

self.window.rootViewController = drawer;

这句话改为

self.window.rootViewController = navController

并且写在 [self.window makeKeyAndVisible]; 的上面试试

Answer 2

self.window.rootViewController = drawer;//这句话去掉
    navController = [[UINavigationController alloc] initWithRootViewController: drawer];
    self.window.rootViewController = navController；//这里加上试试
    [self.window makeKeyAndVisible];