ios 给控件选择性设置圆角

 UILabel * label =[[UILabel alloc]initWithFrame:CGRectMake(100, 200, 100, 100)];
    
    label.backgroundColor=[UIColor cyanColor];
    [self.view addSubview:label];
    
    //贝塞尔曲线
    UIBezierPath * bezierPath2=[UIBezierPath bezierPathWithRoundedRect:label.bounds byRoundingCorners:UIRectCornerTopRight|UIRectCornerBottomRight cornerRadii:CGSizeMake(10, 10)];
    
    //根据贝塞尔曲线进行边缘描绘 只能进行边缘描绘 不能进行填充
    CAShapeLayer *layer2 =[CAShapeLayer layer];
    
    layer2.path=bezierPath2.CGPath;
    layer2.frame=label.bounds;
    layer2.lineWidth=1;
    
    layer2.lineWidth=1;
    
    label.layer.mask=layer2;