uiview 部分圆角

@interface  (RectCorner)  
  
@end  
  
@implementation  (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