UIBezierPath *maskPath = [UIBezierPath bezierPath];
[maskPathmoveToPoint:CGPointMake(SCREEN_WIDTH, 13)];
[maskPathaddLineToPoint:CGPointMake(SCREEN_WIDTH, 15)];
[maskPathaddLineToPoint:CGPointMake(0, 15)];
[maskPathaddLineToPoint:CGPointMake(0, 13)];
//加规则弧线
[maskPathaddQuadCurveToPoint:CGPointMake(SCREEN_WIDTH, 13) controlPoint:CGPointMake(SCREEN_WIDTH/2, 0)];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc]init];
maskLayer.frame=self.xxxView.bounds;
maskLayer.path= maskPath.CGPath;
self.xxxView.layer.mask= maskLayer;
效果如下：
