ios view 绘制圆角

//绘制圆角
+(void)drawCorners:(UIView *)view byRoundingCorners:(UIRectCorner)corners cornerRadii:(CGSize)cornerRadii
{
    UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:corners cornerRadii:cornerRadii];
    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
    maskLayer.frame = view.bounds;
    maskLayer.path = maskPath.CGPath;
    view.layer.mask = maskLayer;
}