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POHow does iOS 7 implement the UI elements so that they look different depending on what SDK you compile with?
 

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  1. POHow does iOS 7 implement the UI elements so that they look different depending on what SDK you compile with?
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    <p>There are elements like <code>UITableView</code>s, <code>UINavigationBar</code>s that have a different style on iOS 7. </p> <p>This style is determined at run time, since those classes are implemented on <code>UIKit</code>, and <code>UIKit</code> is linked with your application dynamically at runtime, not statically at compile time. </p> <p>So one would think that any app run on iOS 7 would have those elements look the way they look on iOS 7. However, they keep the same style they used to have on iOS 6, until you compile with the iOS 7 SDK. Except for some of them (like <code>UIAlertView</code> or <code>UIMenuController</code>)</p> <p>My only explanation for this is that they do something kind of like this:</p> <pre><code>#define SDKApplicationWasLinkedAgainst ... if (SDKApplicationWasLinkedAgainst &lt; 7.0) ... else ... </code></pre> <p>This is obviously really cumbersome, cause they need to keep maintaining a lot of old code. So I'm curious, is this really what is going on under the hood? What am I missing?</p>
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    1. CO@Unicorn: True, however he isn't asking about anything that is specific to iOS 7 that would be covered by the NDA. This question could apply to **any** two versions of iOS.
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      1. USlnafziger
    2. COUnfortunately, unless you are a coder at Apple, you can't really answer the question of how **Apple** does it. You may get some ideas on *a way* that **you** could do it if you reword your question though.
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    3. COThis can actually be answered even if you don't work at Apple, and it won't be an opinion: a college of mine found out how they do it doing some disassembly.
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