设置UIView圆角的拓展

@interface UIView (RectCorner)

@end

@implementation UIView (RectCorner)
- (void)setCornerOnTop {
    UIBezierPath *maskPath;
    maskPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds
                                     byRoundingCorners:(UIRectCornerTopLeft | UIRectCornerTopRight)
                                           cornerRadii:CGSizeMake(10.0f, 10.0f)];
    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
    maskLayer.frame = self.bounds;
    maskLayer.path = maskPath.CGPath;
    self.layer.mask = maskLayer;
    [maskLayer release];
}
- (void)setCornerOnBottom {
    UIBezierPath *maskPath;
    maskPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds
                                     byRoundingCorners:(UIRectCornerBottomLeft | UIRectCornerBottomRight)
                                           cornerRadii:CGSizeMake(10.0f, 10.0f)];
    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
    maskLayer.frame = self.bounds;
    maskLayer.path = maskPath.CGPath;
    self.layer.mask = maskLayer;
    [maskLayer release];
}
- (void)setAllCorner {
    UIBezierPath *maskPath;
    maskPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds
                                          cornerRadius:10.0];
    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
    maskLayer.frame = self.bounds;
    maskLayer.path = maskPath.CGPath;
    self.layer.mask = maskLayer;
    [maskLayer release];
}
- (void)setNoneCorner{
    self.layer.mask = nil;
}

@end