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copied!<p>Rich86Man's answer is correct, but you can use categories to proxy properties such as layer.borderColor. (From the <a href="https://github.com/ConventionalC/ConventionalC/blob/develop/ios/CALayer+XibConfiguration.h" rel="noreferrer">ConventionalC</a> CocoaPod)</p> <p><strong>CALayer+XibConfiguration.h:</strong></p> <pre><code>#import <QuartzCore/QuartzCore.h> #import <UIKit/UIKit.h> @interface CALayer(XibConfiguration) // This assigns a CGColor to borderColor. @property(nonatomic, assign) UIColor* borderUIColor; @end </code></pre> <p><strong>CALayer+XibConfiguration.m:</strong></p> <pre><code>#import "CALayer+XibConfiguration.h" @implementation CALayer(XibConfiguration) -(void)setBorderUIColor:(UIColor*)color { self.borderColor = color.CGColor; } -(UIColor*)borderUIColor { return [UIColor colorWithCGColor:self.borderColor]; } @end </code></pre> <p><img src="https://i.stack.imgur.com/ZSbPt.png" alt="Interface Builder"></p> <pre><code>layer.borderUIColor </code></pre> <p>The result will be apparent during runtime, not in Xcode.</p> <p><strong>Edit</strong>: You also need to set <code>layer.borderWidth</code> to at least 1 to see the border with the chosen color.</p> <p><strong><em>In Swift 2.0:</em></strong></p> <pre><code>extension CALayer { var borderUIColor: UIColor { set { self.borderColor = newValue.CGColor } get { return UIColor(CGColor: self.borderColor!) } } } </code></pre> <p><strong><em>In Swift 3.0:</em></strong></p> <pre><code>extension CALayer { var borderUIColor: UIColor { set { self.borderColor = newValue.cgColor } get { return UIColor(cgColor: self.borderColor!) } } } </code></pre>

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