How to Zoom In/Out Photo on double Tap in the iPhone WWDC 2010 - 104 PhotoScroller

Question

I am going through the Sample code of iPhone WWDC 2010 - 104 PhotoScroller App. It\'s working great with my project related images (PDF Page Images)

but I am struggl

Answer 1

Previous answer could be simpler with BlocksKit, like below.

#import "BlocksKit.h"
...
UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithHandler:^(UIGestureRecognizer *sender, UIGestureRecognizerState state, CGPoint location) {
    if(scrollView.zoomScale != 1.0){
        [scrollView setZoomScale:1.0 animated:YES];
    }else{
        [scrollView setZoomScale:2.0 animated:YES];
    }
}];
[doubleTap setNumberOfTapsRequired:2];
[scrollView addGestureRecognizer:doubleTap];