UIView maskByRoundingCorners:cornerRadius:

UIView+TDKUtil.m

#import "UIView+TDKUtil.h"
 
@implementation UIView (TDKUtil)
 
- (void)maskByRoundingCorners:(UIRectCorner)corners
                 cornerRadius:(CGFloat)cornerRadius
{
    [self layoutIfNeeded];
 
    UIBezierPath *maskPath;
    maskPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds
                                     byRoundingCorners:corners
                                           cornerRadii:CGSizeMake(cornerRadius, cornerRadius)];
 
    CAShapeLayer *maskLayer = [CAShapeLayer new];
    maskLayer.frame = self.bounds;
    maskLayer.path = maskPath.CGPath;
 
    self.layer.mask = maskLayer;
}
 
@end