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，我有一个注销按钮，该按钮应显示UIAlertController。我遇到的挑战是UIAlertController在父视图的子视图（左抽屉）后面显示。

//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];
}

我要在子视图控制器顶部显示UIAlertController。

Answer 1

问题是您正在将menuController.view添加到堆栈中所有其他视图控制器（包括警报控制器）顶部的主窗口中。如果您希望菜单位于所有内容之上，但仍位于警报控制器之下，请将其添加到视图树中除窗口之外的其他内容（请参见当前的VC或堆栈上方的某个内容），这样它就不会出现在菜单顶部警报。

UIAlertController不是锚定在childViewController上，而是显示在parentViewController后面

1 个答案: