@selector in UIPinchGesture is not called

Question

I had detected the two finger touch for imageview and given condition that if two finger is touched then pinchGesture have to perform the selector for imageview.

if ([[event allTouches]count] == 2)
    {
        imageView.multipleTouchEnabled=YES;
        imageView.userInteractionEnabled =YES;
        twoFingerPinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(twoFingerPinch:)];
    }

- (void)twoFingerPinch:(UIPinchGestureRecognizer *)recognizer
{
    CGFloat scale = recognizer.scale;
    imageView.transform = CGAffineTransformScale(imageView.transform, scale, scale);
    recognizer.scale = 1.0;
}

But my twoFingerPinch method is not called. Anybody help me!! Thanks in advance.

score 0 · Answer 1 · answered May 08 '15 at 09:56

As per your code it is hard to say on which view you want to apply pinch gesture,I am considering you are applying it on imageView, here is how you should do it:-

-(void)viewDidLoad
{
UIPinchGestureRecognizer * pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(twoFingerPinch:)];
[imageView addGestureRecognizer:pinch];
[imageView setUserInteractionEnabled:YES];
pinch.delegate = self;
}

- (void)twoFingerPinch:(UIPinchGestureRecognizer *)recognizer
{
    CGFloat scale = recognizer.scale;
    imageView.transform = CGAffineTransformScale(imageView.transform, scale, scale);
    recognizer.scale = 1.0;
}

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
 return NO;  

}

Actually I need to pinch the layered image which is also draggable — Pavithra Selvaraj, May 08 '15 at 10:46

score 0 · Answer 2 · answered May 08 '15 at 09:57

0

Don't sure what are you trying to do, but if you want to pinch just add that directly to the view. Its default behavior for pinch to use 2 fingers.

answered May 08 '15 at 09:57

sarunw

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I want to pinch the layered image which is also draggable – Pavithra Selvaraj May 08 '15 at 10:48
Drag on zoom like photo app? – sarunw May 08 '15 at 12:16
No I have one image1 which is not draggable and I used to select another image from scrollView which is placed(layered) over the image1 it can be draggable and now I want to pinch the layered image. – Pavithra Selvaraj May 08 '15 at 12:35

@selector in UIPinchGesture is not called

2 Answers2