from：http://stackoverflow.com/questions/16512761/calayer-with-transparent-hole-in-it
I was able to solve this with Jon Steinmetz suggestion. If any one cares, here’s the final solution :
1 2 3 4 5 6 7 8 9 10 11 12 | int radius = myRect.size.width; UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, self.mapView.bounds.size.width, self.mapView.bounds.size.height) cornerRadius:0]; UIBezierPath *circlePath = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, 2.0*radius, 2.0*radius) cornerRadius:radius]; [path appendPath:circlePath]; [path setUsesEvenOddFillRule:YES]; CAShapeLayer *fillLayer = [CAShapeLayer layer]; fillLayer.path = path.CGPath; fillLayer.fillRule = kCAFillRuleEvenOdd; fillLayer.fillColor = [UIColor grayColor].CGColor; fillLayer.opacity = 0.5; [view.layer addSublayer:fillLayer]; |