How to set frame for TapGesture Recognizer - ios

Question

I have an imageview and I want to tap on only one side of imageview. Is it possible to set frame for a gesture? Can anyone help with a solution?

Answer 1

Use UIGestureRecognizerDelegate, i think you can get the idea on how to compare:
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
if ([touch locationInView:yourview].x < somePoint.x) {
return false;
} else {
return true;
}
}

Answer 2

you could overlay a view on top of the imageview and add the tap recognizer to this new view, something like this will make the left hand side of the image tapable
UIView tapView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, imageView.frame.size.width/2, imageView.frame.size.height)];
[imageView addSubView:tapView]
UITapGestureRecognizer *singleFingerTap =
[[UITapGestureRecognizer alloc] initWithTarget:self
action:#selector(handleSingleTap:)];
[tapView addGestureRecognizer:singleFingerTap];

Answer 3

You can simply put UIView on top of your imageView with frame as per your requirement and put tap gesture on that UIView.
You can do this by storyboard / xib or by programmatically.
By programmatically, for example - you want to tap only within the area with width of 50 px of your imageView. For this:
UIView *vw = [[UIView alloc] initWithFrame:CGRectMake(imgView.frame.origin.x, imgView.frame.origin.y, 50, imgView.frame.size.height)];
// add gesture to view
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTapGesture:)];
tapGesture.numberOfTapsRequired = 2;
[vw addGestureRecognizer:tapGesture];
[imgView addSubview:vw];
now to handle your double tap
-(void)handleTapGesture:(UITapGestureRecognizer *)gesture
{
// handle double tap
}