没设置之前的效果
- // 单边圆角或者单边框
- UIBezierPath * maskPath = [UIBezierPath bezierPathWithRoundedRect: _testLab.bounds byRoundingCorners: (UIRectCornerTopLeft | UIRectCornerBottomRight) cornerRadii: CGSizeMake(5, 5)];
- // 圆角大小 CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
- maskLayer.frame = _testLab.bounds;
- maskLayer.path = maskPath.CGPath;
- _testLab.layer.mask = maskLayer;
来源: http://www.jianshu.com/p/b88c7170b4ba