Round two corners on UIView

RoundUIViewCorners

Easy helper method:
- (void)setMaskTo:(UIView *)view byRoundingCorners:(UIRectCorner)corners
{
    CGFloat cornerRadius = 6.0;
    UIBezierPath *rounded = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:corners cornerRadii:CGSizeMake(cornerRadius, cornerRadius)];
    CAShapeLayer *shape = [[CAShapeLayer alloc] init];
    [shape setPath:rounded.CGPath];
    view.layer.mask = shape;
}

Call like so:
[self setMaskTo:imageView byRoundingCorners:UIRectCornerTopLeft|UIRectCornerBottomLeft];

From: http://stackoverflow.com/a/11255791/654870