设置视图圆角

#import <QuartzCore/QuartzCore.h>
@implementation UIView (RectCorner)
- (void)setCornerOnTop {
    UIBezierPath *maskPath;
    maskPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds
                                     byRoundingCorners:(UIRectCornerTopLeft | UIRectCornerTopRight)
                                           cornerRadii:CGSizeMake(8.0, 8.0)];
    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(8.0, 8.0)];
    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:8.0];
    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;
}