Question

I want to show my button when the user have zoomed enough in. I want to use the scrollViews zoomscale to determine this.

I do this

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
    if (self.scrollView.zoomScale == 2.0)
    {
         [button setHidden:NO];
    }
    return imageView;
}

But I get bad access when I run my app o.O

Thanks

Answer 1

You mostlikely want to call this method instead:

-(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale

Or even better use:

-(void)scrollViewDidZoom:(UIScrollView *)scrollView
{
    NSLog(@"%f", scrollView.zoomScale);
}

Put your if-statement in any of the methods but don’t use ‘==’ it’s rarely precisely 2.0
Use ‘<‘ instead.