Question

我有以下代码来测试一些模态演示。我尝试通过UINavigationController呈现UBSLoginViewController，然后在UBSLoadingViewController上以透明背景模式呈现UBSLoginViewController，等待一段时间，然后将其解除。

会发生什么：

显示登录视图，
加载视图在登录视图上显示透明，
登录视图消失或加载视图中的透明度消失。无论哪种方式，登录视图在加载视图后面都不再可见。
不解除加载视图。

我在下面收到两条警告。一个是登录视图的第一个演示文稿，第二个是关闭尝试（底部警告1）：

2014-08-22 11:37:52.525 Uberscore[72349:60b] Warning: Attempt to dismiss from view controller <UINavigationController: 0x8c4cfc0> while a presentation or dismiss is in progress!
2014-08-22 11:37:53.088 Uberscore[72349:60b] Unbalanced calls to begin/end appearance transitions for <UINavigationController: 0x8c4cfc0>.

以下代码：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    //Prep window
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    //Set up and display login controller
    UBSLoginViewController* loginView = [[UBSLoginViewController alloc] initWithNibName:LOGINVIEW bundle:nil];
    UINavigationController* navigation = [[UINavigationController alloc] initWithRootViewController:loginView];
    navigation.navigationBarHidden = YES;
    self.window.rootViewController = navigation;
    [self.window makeKeyAndVisible];
    [loginView presentViewController:[[UBSLoadingViewController alloc] initWithNibName:LOADINGVIEW bundle:nil] animated:YES completion:nil];
    int timeout = 3000;
    wait(&timeout);
    [loginView dismissViewControllerAnimated:YES completion:nil];
    return YES;
}

Answer 1

你用这一行解雇了loginView：

[loginView dismissViewControllerAnimated:YES completion:nil];

您想要在加载视图上调用dismissViewControllerAnimated:completion:。

UBSLoadingViewController *loadingView = [[UBSLoadingViewController alloc] initWithNibName:LOADINGVIEW bundle:nil];
[loginView presentViewController:loadingView animated:YES completion:nil];
...
// Later on to dismiss the loading view
[loadingView dismissViewControllerAnimated:YES completion:nil];

根视图消失

1 个答案: