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    <p>EDIT: Guilherme's response is more accurate, although there is still no public way of altering appearances like you can in iOS.</p> <p>NSAppearance isn't much like UIAppearance (from what I can tell), it only relates to having controls under normal or light colored appearances. An example of this would be when you draw into a popover (light) vs a window toolbar perhaps (normal), NSAppearance allows you to identify which environment you're drawing into. To be honest I haven't used it yet, but the most information I've found was in the WWDC 2013 video on What's new in Cocoa and the <a href="https://developer.apple.com/library/mac/releasenotes/AppKit/RN-AppKit/#//apple_ref/doc/uid/TP30000741-CH2-SW44" rel="nofollow">10.9 release notes</a></p> <p>From my understanding, it allows you to specify what the control looks like on a particular background. If a control you use is to be reused on a different background, you could check the current appearance and draw your control accordingly using <code>[NSAppearance currentAppearance]</code></p> <p>Another important part is that there is a new protocol your views or windows can adopt called the <a href="https://developer.apple.com/library/mac/documentation/AppKit/Reference/NSAppearanceCustomization_Protocol/Reference/Reference.html" rel="nofollow">NSAppearanceCustomization protocol</a> which allows you to specify that view's appearance. Not exactly sure how this works but it's there. Some Cocoa control also have these implemented which are discussed in the <a href="https://developer.apple.com/library/mac/documentation/UserExperience/Conceptual/AppleHIGuidelines/Controls/Controls.html#//apple_ref/doc/uid/TP30000359-SW114" rel="nofollow">HIG for Controls</a>.</p> <p>There are 2 appearances that Apple defines but you might be able to define your own using your own strings (again, not sure). At the bottom of the docs you linked to you'll find these 2 constants:</p> <pre><code>APPKIT_EXTERN NSString *const NSAppearanceNameAqua; APPKIT_EXTERN NSString *const NSAppearanceNameLightContent; </code></pre> <p>So it's no UIAppearance, it's just a way of knowing what type of background you're drawing onto.</p>
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    1. POHow can I make an "appearance file" for NSAppearance?
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    1. USLucas Derraugh
    1. USLucas Derraugh
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    1. COThanks, I give +1 for the HIG link that explains the difference between `NSAppearanceNameLightContent` and `NSAppearanceNameAqua`, but what my question asks is about the "appearance files" referenced in the docs. Not only does it talk about creating your own, but the few methods that are public in the class are for loading one from the app bundle (not the built in ones).
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      1. USBrad Allred
    2. CO@BradAllred I'll see if I can get a working example some time. There is no sample code for it so it's hard to tell exactly how you would use it. I agree though, it sounds like you could make your own NSAppearance object but I'm not sure how that would be used in IB.
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      1. USLucas Derraugh
 

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