UIAlertController 没有锚定在 childViewController 上，而是显示在它后面的 parentViewController 上

Question

我创建了一个左侧菜单抽屉并将其添加为子视图控制器。在左侧菜单抽屉中，我有一个应显示 UIAlertController 的注销按钮。我遇到的挑战是 UIAlertController 显示在父视图的子视图（左抽屉）后面。

//ParentVC 
//adding childVC
  DrawerViewController *menuController = [[DrawerViewController alloc] init];
  [self addChildViewController:menuController];
  [self.view addSubview:menuController.view];
  [menuController didMoveToParentViewController:self];
  [[[[UIApplication sharedApplication] delegate] window] addSubview:menuController.view];
  menuController.definesPresentationContext = YES;

//displaying childVC from parentVC
  [UIView animateWithDuration:0.3 animations:^{
    [menuController.view setFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
    [self.view setFrame:CGRectMake(self.view.frame.size.width*0.7, 0, self.view.frame.size.width, self.view.frame.size.height)];

  }];


//ChildVC
//logout action
-(void) logOutButtonListener:(UIButton *) sender{
NSLog(@"logOutButtonListener");

UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Logout" message:@"Are you sure you want to logout?" preferredStyle:UIAlertControllerStyleAlert ];

UIAlertAction* noButton = [UIAlertAction actionWithTitle:@"no" style:UIAlertActionStyleCancel handler:nil];
[alert addAction:noButton];

UIAlertAction* yesButton = [UIAlertAction actionWithTitle:@"yes" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action){
    //logout logic
}];
[alert addAction:yesButton];

[self presentViewController:alert animated:YES completion:nil];
}

我想要的是在子视图控制器的顶部显示 UIAlertController。

Answer 1

问题是您将 menuController.view 添加到堆栈中所有其他视图控制器（包括警报控制器）之上的主 window。如果您希望菜单位于所有内容之上，但仍在警报控制器下，请将其添加到视图树中除 window 之外的其他内容（请参阅当前的 VC 或堆栈更高的内容）所以它不会出现在警报的顶部。

UIAlertController 没有锚定在 childViewController 上，而是显示在它后面的 parentViewController 上

UIAlertController not anchored on childViewController but rather displaying behind it on parentViewController

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