IOS指定某个试图某个角圆角

- (void)initCornerView:(UIView *)cornerView byRoundingCorners:(UIRectCorner)corners

{

    UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:cornerView.bounds byRoundingCorners:corners cornerRadii:CGSizeMake(5, 5)];

    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];

    maskLayer.frame = cornerView.bounds;

    maskLayer.path = maskPath.CGPath;

    cornerView.layer.mask = maskLayer;

    [maskLayer release];

}