BezierPath和掩蔽

我想在我的视图中设置UIBezierPath作为掩码：目标是这样的：

所以我用框架绘制视图：

CGFloat round = 80; UIView *myView = [[UIView alloc] initWithFrame:CGRectMake(self.frame.size.width/2-105, 0, 210, 60+round)]; myView.backgroundColor = [UIColor redColor]; 

然后尝试添加BezierMask：

 UIBezierPath *aPath = [UIBezierPath bezierPath]; CGSize viewSize = CGSizeMake(myView.frame.size.width, myView.frame.size.height); //(210,80) CGPoint startPoint = CGPointMake(myView.frame.origin.x,myView.frame.origin.y); //(279,0) [aPath moveToPoint:startPoint]; //(279,0) [aPath addLineToPoint:CGPointMake(startPoint.x+viewSize.width,startPoint.y)]; //(489,0) [aPath addLineToPoint:CGPointMake(startPoint.x+viewSize.width,startPoint.y+viewSize.height-round)]; //(489,60) [aPath addQuadCurveToPoint:CGPointMake(startPoint.x,startPoint.y+viewSize.height-round) controlPoint:CGPointMake(startPoint.x+(viewSize.width/2),80)]; //(279,60) : (384,80) [aPath closePath]; CAShapeLayer *layer = [CAShapeLayer layer]; layer.frame = myView.bounds; layer.path = aPath.CGPath; myView.layer.mask = layer; [self addSubview:myView]; 

但在那之后我的观点正在消失。 为什么？

Answer 1

我猜你正在使用不正确的掩码层协调。 您的遮罩层必须位于遮罩的视图中，而不是位于视图的超级视图中。

尝试这些更改：

 CGSize viewSize = myView.bounds.size; CGPoint startPoint = CGPointZero; 

使用这些小修改的代码对我来说很合适。