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

Subclass the UIScrollView an in m file add

#pragma mark -
#pragma mark doubleTouch

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];
    NSUInteger tapCount = [touch tapCount];
    switch (tapCount) {
        case 2:
        {
            if(self.zoomScale <1.0){
                [self setZoomScale:1.0 animated:YES];
            }else{
                [self setZoomScale:0.1 animated:YES];
            }

            break;
        }
        default:
            break;
    }
}