[英]CALayer containsPoint with mask not working
我有一个具有CALayer掩码的UIView:
// Getting the right mask image
UIImage *myimage = [UIImage imageNamed:[NSString stringWithFormat:@"img%d", imageIndex]];
// Scaling image to fit UIView
UIGraphicsBeginImageContextWithOptions(self.frame.size, NO, 0.0);
[myimage drawInRect:self.bounds];
myimage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[self.layer setMasksToBounds:YES];
// Setting mask
UIImage *_maskingImage = myimage;
CALayer *_maskingLayer = [CALayer layer];
_maskingLayer.frame = self.bounds;
[_maskingLayer setContents:(id)[_maskingImage CGImage]];
[self.layer setMask:_maskingLayer];
当用户稍后短按(UILongPressGestureRecognizer *)UIView时,我只希望如果用户在 UIView图层蒙版中轻按即可发生操作(目前,containsPoint始终返回YES):
// Object is a UIView
CALayer *layer = [Object.layer mask];
// Sender is a UILongPressGestureRecognizer
location2 = [sender locationInView:Object];
// The position is correct
NSLog(@"%@", NSStringFromCGPoint(location2));
if ([layer containsPoint:location2]){
NSLog(@"HELLO WORLD!");
return;
}
请帮助?
我的书有两个建议。 如果知道蒙版图形的边界路径,则可以使用CGPathContainsPoint
。 或者,如果所讨论的图层在外部是透明的,而在内部是不透明的,则可以检查点按的像素处的像素是否透明。
http://www.apeth.com/iOSBook/ch18.html#_hit_testing
向下滚动到“图纸命中测试”部分。
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