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    <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 &lt;QuartzCore/QuartzCore.h&gt; #import &lt;UIKit/UIKit.h&gt; @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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    1. POIs it possible to set UIView border properties from interface builder?
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    1. USPeter DeWeese
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    1. COI can't get this to work for me. The .m file moans about borderColor having to be borderUIColor and to fix it, after doing so it still shows warnings and the border color doesnt render at runtime. The bit that is different on mine is I have @ implementation NameOfFile, not @ implementation CALayer(NameOfFile), I dont understand the CALayer part, could you explain that more please
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      1. USDave Haigh
    2. COCALayer(myCategory) is a category, that is, it adds its methods to an existing class that is implemented elsewhere. In this case CALayer is included with the framework and I am just adding the borderUIColor property to it. Your way of implementing this will not work, although I suppose that you could add the property to your view controller and have it update the layer instead.
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