Loading animation Memory leak - iphone

Question

I have written network class that is managing all network calls for my application. There are two methods showLoadingAnimationView and hideLoadingAnimationView that will show UIActivityIndicatorView in a view over my current viewcontroller with fade background. I am getting memory leaks somewhere on these two methods. Here is the code
-(void)showLoadingAnimationView
{
textmeAppDelegate *textme = (textmeAppDelegate *)[[UIApplication sharedApplication] delegate];
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];
if(wrapperLoading != nil)
{
[wrapperLoading release];
}
wrapperLoading = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, 320.0, 480.0)];
wrapperLoading.backgroundColor = [UIColor clearColor];
wrapperLoading.alpha = 0.8;
UIView *_loadingBG = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, 320.0, 480.0)];
_loadingBG.backgroundColor = [UIColor blackColor];
_loadingBG.alpha = 0.4;
circlingWheel = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
CGRect wheelFrame = circlingWheel.frame;
circlingWheel.frame = CGRectMake(((320.0 - wheelFrame.size.width) / 2.0), ((480.0 - wheelFrame.size.height) / 2.0), wheelFrame.size.width, wheelFrame.size.height);
[wrapperLoading addSubview:_loadingBG];
[wrapperLoading addSubview:circlingWheel];
[circlingWheel startAnimating];
[textme.window addSubview:wrapperLoading];
[_loadingBG release];
[circlingWheel release];
}
-(void)hideLoadingAnimationView
{
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
wrapperLoading.alpha = 0.0;
[self.wrapperLoading removeFromSuperview];
//[NSTimer scheduledTimerWithTimeInterval:0.8 target:wrapperLoading selector:#selector(removeFromSuperview) userInfo:nil repeats:NO];
}
Here is how I am calling these two methods
[NSThread detachNewThreadSelector:#selector(showLoadingAnimationView) toTarget:self withObject:nil];
and then somewhere later in the code i am using following function call to hide animation.
[self hideLoadingAnimationView];
I am getting memory leaks when I call showLoadingAnimationView function. Anything wrong in the code or is there any better technique to show loading animation when we do network calls?

Answer 1

The method showLoadingAnimationView returns a non auto-released view (retainCount -> 1), that you later (I assume) add to another view (retainCount -> 2).
In hideLoadingAnimationView, you only remove the view from its superview (retainCount -> 1). There is a missing release in this method. That means that you should not call release in the showLoadingAnimationView.