+ (UIBezierPath *)bezierPathWithRoundedRect:(CGRect)rect
                          byRoundingCorners:(UIRectCorner)corners
                                cornerRadii:(CGSize)cornerRadii

enum {
   UIRectCornerTopLeft     = 1 << 0,
   UIRectCornerTopRight    = 1 <<
 
 1,
   UIRectCornerBottomLeft  = 1 << 2,
   UIRectCornerBottomRight = 1 << 3,
   UIRectCornerAllCorners  = ~0
};
typedef NSUInteger UIRectCorner;

UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(120, 10, 80, 80)];
view2.backgroundColor = [UIColor redColor];
[self
 
.view addSubview:view2];
    
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view2.bounds byRoundingCorners:UIRectCornerBottomLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(10, 10)];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = view2.bounds;
maskLayer
 
.path = maskPath.CGPath;
view2.layer.mask = maskLayer;