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    <p>Starting in iOS 3.2, you can use the functionality of <code>UIBezierPath</code>s to create an out-of-the-box rounded rect (where only corners you specify are rounded). You can then use this as the path of a <code>CAShapeLayer</code>, and use this as a mask for your view's layer:</p> <pre><code>// Create the path (with only the top-left corner rounded) UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:imageView.bounds byRoundingCorners:UIRectCornerTopLeft cornerRadii:CGSizeMake(10.0, 10.0)]; // Create the shape layer and set its path CAShapeLayer *maskLayer = [CAShapeLayer layer]; maskLayer.frame = imageView.bounds; maskLayer.path = maskPath.CGPath; // Set the newly created shape layer as the mask for the image view's layer imageView.layer.mask = maskLayer; </code></pre> <p>And that's it - no messing around manually defining shapes in Core Graphics, no creating masking images in Photoshop. The layer doesn't even need invalidating. Applying the rounded corner or changing to a new corner is as simple as defining a new <code>UIBezierPath</code> and using its <code>CGPath</code> as the mask layer's path. The <code>corners</code> parameter of the <code>bezierPathWithRoundedRect:byRoundingCorners:cornerRadii:</code> method is a bitmask, and so multiple corners can be rounded by ORing them together. <br> <br></p> <hr> <h2>EDIT: Adding a shadow</h2> <p>If you're looking to add a shadow to this, a little more work is required.</p> <p>Because "<code>imageView.layer.mask = maskLayer</code>" applies a mask, a shadow will not ordinarily show outside of it. The trick is to use a transparent view, and then add two sublayers (<code>CALayer</code>s) to the view's layer: <code>shadowLayer</code> and <code>roundedLayer</code>. Both need to make use of the <code>UIBezierPath</code>. The image is added as the content of <code>roundedLayer</code>.</p> <pre><code>// Create a transparent view UIView *theView = [[UIView alloc] initWithFrame:theFrame]; [theView setBackgroundColor:[UIColor clearColor]]; // Create the path (with only the top-left corner rounded) UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:theView.bounds byRoundingCorners:UIRectCornerTopLeft cornerRadii:CGSizeMake(10.0f, 10.0f)]; // Create the shadow layer CAShapeLayer *shadowLayer = [CAShapeLayer layer]; [shadowLayer setFrame:theView.bounds]; [shadowLayer setMasksToBounds:NO]; [shadowLayer setShadowPath:maskPath.CGPath]; // ... // Set the shadowColor, shadowOffset, shadowOpacity &amp; shadowRadius as required // ... // Create the rounded layer, and mask it using the rounded mask layer CALayer *roundedLayer = [CALayer layer]; [roundedLayer setFrame:theView.bounds]; [roundedLayer setContents:(id)theImage.CGImage]; CAShapeLayer *maskLayer = [CAShapeLayer layer]; [maskLayer setFrame:theView.bounds]; [maskLayer setPath:maskPath.CGPath]; roundedLayer.mask = maskLayer; // Add these two layers as sublayers to the view [theView.layer addSublayer:shadowLayer]; [theView.layer addSublayer:roundedLayer]; </code></pre>
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    1. PORounded UIView using CALayers - only some corners - How?
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    1. CONice one, this helped me a lot on grouped UITableView cell's selectedBackgroundViews :-)
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    2. COAnyway to add a drop shadow to this view after you've rounded the corners? Attempted the following without success. ` self.layer.masksToBounds = NO; self.layer.shadowColor = [UIColor blackColor].CGColor; self.layer.shadowRadius = 3; self.layer.shadowOffset = CGSizeMake(-3, 3); self.layer.shadowOpacity = 0.8; self.layer.shouldRasterize = YES; `
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    3. CO@ChrisWagner: See my edit, with regards to applying a shadow to the rounded view.
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