xcode 4.3 - storyboard - iAd keeps moving - iphone

Question

I have added iAd to my iphone app to be at the top of my app. originally I place it at x=0 and y=-50 so that it comes from off the screen. I use the following code for it in my .m :
- (void)bannerView:(ADBannerView *)abanner didFailToReceiveAdWithError:(NSError *)error
{
if (self.bannerIsVisible)
{
[UIView beginAnimations:#"animateAdBannerOff" context:NULL];
// Assumes the banner view is placed at the bottom of the screen.
banner.frame = CGRectOffset(banner.frame, 0, banner.frame.size.height);
[UIView commitAnimations];
self.bannerIsVisible = NO;
}
}
- (void)bannerViewDidLoadAd:(ADBannerView *)abanner
{
if (!self.bannerIsVisible)
{
[UIView beginAnimations:#"animateAdBannerOn" context:NULL];
// Assumes the banner view is just off the bottom of the screen.
banner.frame = CGRectOffset(banner.frame, 0, banner.frame.size.height);
[UIView commitAnimations];
self.bannerIsVisible = YES;
}
}
When my app launch iAd get displayed at the top without any problem. but when I open another app and come back to it (without killing it so my app is running in the background) the banner moves another 50 pixel down
any idea?

Answer 1

You are adding 50.0px to banner.frame.origin.y in both cases.
Anyway: even if you'd be substracting 50.px in didFailToReceiveAdWithError: it
could happen that didFailToReceiveAdWithError: would get called multiple times in a
row and your code could move the banner higher and higher up (-50.0,-100.0,-150.0...).
So it's better to hardcode the hidden & visible positions instead of calculating it.
Try this:
- (void)bannerView:(ADBannerView *)abanner didFailToReceiveAdWithError:(NSError *)error
{
if (self.bannerIsVisible)
{
[UIView beginAnimations:#"animateAdBannerOff" context:NULL];
banner.frame = CGRectMake(0.0,-50.0,banner.frame.size.width,banner.frame.size.height);
[UIView commitAnimations];
self.bannerIsVisible = NO;
}
}
- (void)bannerViewDidLoadAd:(ADBannerView *)abanner
{
if (!self.bannerIsVisible)
{
[UIView beginAnimations:#"animateAdBannerOn" context:NULL];
banner.frame = CGRectMake(0.0,0.0,banner.frame.size.width,banner.frame.size.height);
[UIView commitAnimations];
self.bannerIsVisible = YES;
}
}