Rounding corners on UIViews (and their subclasses, UIImageView, etc)

RoundedCorners.m

UIImageView * roundedView = [[UIImageView alloc] initWithImage: [UIImage imageNamed:@"wood.jpg"]];
// Get the Layer of any view
CALayer * l = [roundedView layer];
[l setMasksToBounds:YES];
[l setCornerRadius:10.0];

UIImageView *roundedView;
CALayer *roundedViewLayer;

roundedView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"wood.jpg"]];

/**
 *  Get the animation layer of the view
 *  Note: To circumvent performance issues when animated we rasterise accordingly.
 */
roundedViewLayer = self.view.layer;
roundedViewLayer.masksToBounds = YES;
roundedViewLayer.cornerRadius = 10.0f;
roundedViewLayer.shouldRasterize = YES;
roundedViewLayer.rasterizationScale = [[UIScreen mainScreen] scale];

Thanks Sam!