I have ImageView that I crop to circle with this:
self.contentMode = UIViewContentModeScaleAspectFill;
self.layer.cornerRadius = self.bounds.size.height / 2.0;
self.layer.masksToBounds = YES;
Then I added gesture recognizer to it, but it fires in cropped area.
How can I avoid firing it in cropped area?
A more general and flexible way to mask your image is with a CAShapeLayer. You can create any shape, including a circle, to use as a mask. By using this approach to crop your image view instead of using cornerRadius
, you can check if the touch point is within the layer's path (a UIBezierPath
). In the UIImageView
subclass add the following code to create the mask, and create a property, shape, in the .h file.
self.shape = [UIBezierPath bezierPathWithOvalInRect:self.bounds];
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
shapeLayer.path = self.shape.CGPath;
self.layer.mask = shapeLayer;
In the controller, add the tap gesture recognizer, and use this code in its action method,
-(void)handleTap:(UITapGestureRecognizer *) tapper {
CGPoint touchPoint = [tapper locationInView:tapper.view];
if ([self.imageView.shape containsPoint:touchPoint]) {
NSLog(@"touched");
// do what you want with the touch here
}
}
UIGestureRecognizerDelegate
Then use this delegate to decide that if you want it fire or not
-(BOOL) gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
Example Code
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
CGPoint touchPoint = [touch locationInView:self.imageview];
if (CGRectContainsPoint(self.imageview.bounds, touchPoint)) {
CGFloat centerX = CGRectGetMidX(self.imageview.bounds);
CGFloat centerY = CGRectGetMidY(self.imageview.bounds);
CGFloat radius2 = pow((touchPoint.x -centerX),2)+ pow((touchPoint.y - centerY), 2);
if (radius2 < pow(CGRectGetWidth(self.imageview.frame)/2, 2)) {
return YES;
}
}
return NO;}
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