viewForZoomingInScrollView - iphone

Question

I have a few buttons that each load a different image a UIScrollView, you can zoom in on these images. What happens is that after selecting a new images the previous one is still there in the scrollview. How do I clean up the scroll view before opening a new image in there?
This is the code so far:
- (UIView *) viewForZoomingInScrollView: (UIScrollView *)scrollView{
return imgView;
}
-(IBAction)buttonClicked: (UIButton *)sender{
switch (sender.tag) {
case 1:{
UIImageView *myImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"Gath.jpg"]];
self.imgView = myImageView;
[myImageView release];
scrollView.contentSize = CGSizeMake(imgView.frame.size.width, imgView.frame.size.height);
scrollView.maximumZoomScale = 4.0;
scrollView.minimumZoomScale = 1.0;
scrollView.clipsToBounds = YES;
scrollView.delegate = self;
[scrollView addSubview:imgView];
}
}
}

Answer 1

You keep adding new subviews without removing the previous ones. You could just replace the image content in the existing imageView instead of making a new one.
Replace this:
UIImageView *myImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"Gath.jpg"]];
self.imgView = myImageView;
[myImageView release];
with
self.imageView.image = [UIImage imageNamed:#"Gath.jpg"];
and remove this
[scrollView addSubview:imgView];
I assume you have linked the imageView to self.imageView elsewhere, such as in the storyboard, or when you create the scrollView.

Answer 2

you can try this,
[myImageView removeFromSuperView];
myImageView=nil;
myImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"Gath.jpg"]];