Ask, CGAffineTransform lead UITapGestureRecognizer failure!

I have a imgView, add tap events are as follows:

 
UITapGestureRecognizer * singleTap = [[UITapGestureRecognizer alloc] initWithTarget: self action: @ selector (onImageClick :)]; 
[Self.imgView addGestureRecognizer: singleTap]; 
[SingleTap release]; 
[Self.imgView setUserInteractionEnabled: YES]; 

This is normal, but when I use CGAffineTransform right imgView After processing, singleTap failure, the following code:

 
CGAffineTransform scale = CGAffineTransformMakeScale (1.5, 1.5); 
CGAffineTransform translate = CGAffineTransformMakeTranslation (5.0, 5.0); 
self.imgView.transform = CGAffineTransformConcat (scale, translate); 

Some people know how it is you? Thank you!
Reply:
After CGAffineTransform not know why not use CABasicAnimation replaced.