Background picture is "blinking" when the screen orientation is changed - ios

Question

I would like to change the background picture of my view controller, when the orientation is changed. I call my setupGUIForOrientation function in shouldAutorotateToInterfaceOrientation, like this:
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
[self setupGUIForOrientation:interfaceOrientation];
return YES;
}
The setupGUIForOrientation function:
-(void)setupGUIForOrientation:(UIInterfaceOrientation)orientation
{
if(!background) background = [[UIImageView alloc] init];
UIImage* image = [[StorageProvider storage].imageProvider getImageForSurfaceElement:#"background"];
int width = 0;
int height = 0;
CGRect bounds = [[UIScreen mainScreen] bounds];
if(UIInterfaceOrientationIsPortrait(orientation)) {
width = MIN(bounds.size.width, bounds.size.height);
height = MAX(bounds.size.width, bounds.size.height);
} else {
width = MAX(bounds.size.width, bounds.size.height);
height = MIN(bounds.size.width, bounds.size.height);
}
background.frame = CGRectMake(0, 0, width, height);
[self.view addSubview: background];
[self.view sendSubviewToBack: background];
[background setImage:image];
}
Everything is good (the image and the frame changes) except one thing: when the rotation happens, I can see the view controller's background color for one second, which is really ugly. Can I prevent it somehow? And, can I code this function on a better way? Thanks for any help!

Answer 1

I'm guessing, but you may be updating your view too early. Rather than call your method in shouldAutorotateToInterfaceOrientation, have you tried doing it in didRotateFromInterfaceOrientation?
I.e. making this change:
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return YES;
}
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
[self setupGUIForOrientation:self.interfaceOrientation];
}