Right navbar button moves when alertview is dismissed

Question

I'm adapting an iOS 6 app to iOS 7 and I'm experiencing an strange "error". In a screen there's a rightBarButtonItem with a simple image that is showed in his place. But, if the app shows an alertview, the image moves down (50 px or so) when I tap the OK button of the alertview (the only button in this alert). There's no action linked to this alertview, it's only informational.

Also, if I change the image (setImage) of the button, this image will appear out of place.

Answer 1

Well, I finally found myself a solution:

I had a UIBarButtonItem with UIBarButtonItemStylePlain and an image setted with setImage on the UIBarButtonItem.

To solve the issue, I have created an UIButton with the image (setting its frame with an CGRectMake) , and then I have created the UIBarButtonItem with initWithCustomView and using the UIButton as the CustomView. This way the image is always where it should be.

Edit:

UIButton* aButton = [UIButton buttonWithType:UIButtonTypeCustom];
aButton.frame = CGRectMake(0.0, 40.0, 30.0, 30.0);
[aButton setBackgroundImage:[UIImage imageNamed:@"anImage.png"] forState:UIControlStateNormal];
[aButton addTarget:self action:@selector(aFunction:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *anUIBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:aButton]; 
self.navigationItem.rightBarButtonItem = anUIBarButtonItem;