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[nicksayes]

I'm a newbie iPhone developer - going very well, almost finished my first app minus this one issue which I am a little embarrassed to be asking but...

I have a UIImageView that I have animated to fade (alpha value) over the period of 60s. After the animation a UIButton displays. In addition by tapping you can force the alpha value of the UIImageView down as to make the animation appear faster. But I am having trouble determining when the alpha value of my UIImageView is below zero - so that I can display the button - even though the animation is still running. Here is my code:

- (void)fadeTheImageView
{
	[fadeImageView setAlpha:1.0];

	[UIView beginAnimations:@"theAnimation" context:NULL];
	[UIView setAnimationDelegate:self];
	[UIView setAnimationDidStopSelector:@selector(yourAnimationHasFinished:finished:context:)];
	[UIView setAnimationDuration:10];
	[fadeImageView setAlpha:0.0];
	[UIView commitAnimations];	
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
	if ( fadeImageView.alpha <= 0.0 ) {
		[saveButton setHidden:NO];
	}
	[fadeImageView setAlpha:(fadeImageView.alpha - 0.1)];
}

- (void)yourAnimationHasFinished:(NSString *)animationID finished:(BOOL)finished context:(void *)context;
{
	[saveButton setHidden:NO];
}

The error is with the - if ( fadeImageView.alpha <= 0.0 ) {
incompatible variable types.
I've tried everything.

Any help would be appreciated