CODEWITHSUNDEEP
iosobjective-cuigesturerecognizer
whoops1122
whoops1122

Reputation: 33

UIPinchGestureRecognizer questions with subviews

I have the following code:

m_singleView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, nWidth - 1, nHeight - 1)];
m_singleView.backgroundColor = [UIColor clearColor];
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
[pinchGesture setCancelsTouchesInView:YES];
[m_singleView addGestureRecognizer:pinchGesture];
[m_singleView setUserInteractionEnabled:YES];
[m_MainView addSubview:m_singleView];

The issue that I'm having is that the pinch event for some reason does not fire. However, if i change line from [m_singleView addGestureRecognizer:pinchGesture] to [m_MainView addGestureRecognizer:pinchGesture]; then everything will work fine... can I not add the event for subview only?

Thanks!

Upvotes: 0

Views: 131

Answers (2)

Rate Morgan
Rate Morgan

Reputation: 305

Use Debug view hierarchy to see whether the size of m_singleView are 0 or not? If so, the size of m_singleView needs to be changed until you can touch it.

Upvotes: 0

Sagar koyani
Sagar koyani

Reputation: 431

Yes,you can add gesture to subview. i tested your code like below works fine.

First add delegate.

@interface ViewController : UIViewController<UIGestureRecognizerDelegate>

- (void)viewDidLoad {
    [super viewDidLoad];
   
   UIView *m_singleView = [[UIView alloc] initWithFrame:CGRectMake(50, 50, self.view.frame.size.width - 50, self.view.frame.size.height - 50)];
    self.view.backgroundColor=[UIColor greenColor];
    m_singleView.backgroundColor = [UIColor redColor];
    UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch)];
    pinchGesture.delegate=self;
    [pinchGesture setCancelsTouchesInView:YES];
    [m_singleView addGestureRecognizer:pinchGesture];
    [m_singleView setUserInteractionEnabled:YES];
    [self.view addSubview:m_singleView];
}

-(void)pinch{
    NSLog(@"In PInch");
}

you have used pinchgesture so you can use it like below.

enter image description here

Upvotes: 2

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