从appDelegate呈现ViewController

Question

每当应用程序来自applicationDidEnterBackground方法中的背景时，我都需要从appDelegate中显示一个ViewController。

* securityCheck会提示用户输入密码，非常类似于iOS中的普通密码。 一旦验证了密码，我将在securityCheck中调用dimissViewControllerAnimated，然后留下空白的UINavigationController，因为该视图是从appDelegate呈现的，所以我没有任何记录该视图的呈现者的记录，因此我无法popToRootViewController。

我的问题是如何正确关闭SecurityCheckViewController，以便在应用程序进入后台之前显示用户所在的ViewController。

这是我的代码：

在AppDelegate.m内部调用此方法

- (void)securityCheck {

   SecurityCheckViewController *securityCheck = [[SecurityCheckViewController alloc] init];
   UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:securityCheck];

   [securityCheck presentedByAppDelegate:YES];

   self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
   [self.window setRootViewController:navigationController];
   [self.window makeKeyAndVisible];
}

然后在SecurityCheckViewController.m中，我有

- (void)unlockWasSuccessfulForPadLockScreenViewController:(ABPadLockScreenViewController *)padLockScreenViewController {

    [self.appDelegate securityCheckDone];
    [padLockScreenViewController dismissViewControllerAnimated:YES completion:nil];

     NSLog(@"Sucsessfull Unlock");I'm 
}

Answer 1

当下

- (void)securityCheck {
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main_iPhone" bundle:nil];
    SecurityCheckViewController *securityCheck = [storyboard instantiateViewControllerWithIdentifier:@"securityCheckView"];
    [self.window.rootViewController presentViewController:securityCheck animated:NO completion:nil];
}

解雇

[self dismissViewControllerAnimated:YES completion:nil];

Answer 2

您可以从application：didFinishLaunchingWithOptions调用它

注意：属性检查器上的所有storyBoard“ initialViewControllers”复选框均已关闭

    UIStoryboard *storyboard = 
        [UIStoryboard storyboardWithName:@"Registration" bundle:nil];

    RegisterViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"RegisterViewController"];

    //this is key else you get a black screen
    self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];

    self.window.rootViewController = vc;
    [self.window makeKeyAndVisible];