UIview.hidden不会消失，而是隐藏在另一个视图后面

Question

So I am trying to hide a UIView but something weird is happening. After using this line of code:

ntcCircleView.hidden = YES;

The view won't disappear, but it hides behind another UIView.

This is the complete code I use:

UIView* NtcContainer=[[UIView alloc]initWithFrame:CGRectMake(self.view.frame.size.width - 40-17, 3, 40, 40)];
UIView* NtcView=[[UIView alloc]initWithFrame:CGRectMake(5, 0, 40, 40)];


notificationButton  = [ZFRippleButton buttonWithType:UIButtonTypeCustom];
notificationButton.frame = CGRectMake(0, 0, 40, 40);
notificationButton.layer.cornerRadius=menuButton.frame.size.width/2;
[notificationButton addTarget:self action:@selector(goToNotificationsList:) forControlEvents:UIControlEventTouchUpInside];
notificationImage=[[UIImageView alloc]initWithFrame:CGRectMake(10, 12, 20, 20)];
notificationImage.image=[UIImage imageNamed:[HotelStay sharedInstance].icon.Notification];

ntcCircleView = [[UIView alloc] initWithFrame:CGRectMake(20,5,16,16)];
ntcCircleView.alpha = 0.7;
ntcCircleView.layer.cornerRadius = ntcCircleView.frame.size.width/2;  // half the width/height
ntcCircleView.backgroundColor = [UIColor redColor];

ntcNumberLabel = [[UILabel alloc] initWithFrame:CGRectMake(0,0,16,16)];
ntcNumberLabel.textAlignment = NSTextAlignmentCenter;
[ntcNumberLabel setTextColor:[UIColor whiteColor]];
[ntcNumberLabel setFont:[UIFont fontWithName:@"HelveticaNeue" size:11.0]];

[ntcCircleView addSubview:ntcNumberLabel]; 
int ntcNum = [dataManager getUnreadNotificationNumber];
if (ntcNum==0)
{
    ntcCircleView.hidden = YES;
}else
{
    ntcNumberLabel.text = [NSString stringWithFormat:@"%i",ntcNum];
}

[NtcView addSubview:notificationImage];
[NtcView addSubview:notificationButton];
[NtcView addSubview:ntcCircleView];
[NtcContainer addSubview:NtcView];

[self.view addSubview:NtcContainer];

So ntcCircleView after hidding it, just goes behind notificationImage .

What drives me crazy, is that I use successfully the exact same code in another Views with the only difference the last line. Instead of using:

[self.view addSubview:NtcContainer];

I add the views to the navigation bar like this:

UIBarButtonItem *ntcBarItem = [[UIBarButtonItem alloc] initWithCustomView:NtcContainer];
self.navigationItem.rightBarButtonItem = ntcBarItem;

What am I missing here ?

UPDATE

I also noticed that this bug happens only when I use

[self.navigationController popViewControllerAnimated:YES];

to navigate back to the view.

Answer 1

You need to update these snippet:

[NtcView addSubview:notificationImage];
[NtcView addSubview:notificationButton];
[NtcView addSubview:ntcCircleView];
[NtcContainer addSubview:NtcView];

to:

[NtcView addSubview:notificationButton];
[NtcView addSubview:ntcCircleView];
[NtcView addSubview:notificationImage];
[NtcContainer addSubview:NtcView];

It will solve your problem.

Answer 2

I figured it out. I was using a deprecated method (viewDidUnload) to release the notification observer.