ios - pushviewcontroller 不起作用？

Question

viewcontroller 上有一个按钮，当我单击 按钮 pushviewcontroller 不起作用。

---

我的 appdelegate.m 文件:

- (BOOL)applicationUIApplication *)application **didFinishLaunchingWithOptionsNSDictionary** *)launchOptions 
{
    self.window = [[UIWindow alloc] initWithFrame:EK_SCREEN_BOUNDS];

    ExampleViewController *exampleViewController = [ExampleViewController new];

    self.window.rootViewController = exampleViewController;

   [self.window makeKeyAndVisible];

   return YES;
}

---

按钮点击方法(在ExampleViewController中):

mainViewController *frm = [mainViewController new];
[self.navigationController pushViewController:frm animated:YES];

如何触发按钮点击事件？

Answer 1

使用以下代码更新您的 AppDelegate.m 文件

self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
ExampleViewController *exampleViewController = [ExampleViewController new];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:exampleViewController];
self.window.rootViewController = navController;
//self.window.backgroundColor = [UIColor lightGrayColor];
[self.window makeKeyAndVisible];

The problem is that you are not initializing rootViewController from navigation controller. So, when you push a view controller on navigation controller it doesn't work. Because you never initialize a navigation controller.