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    <p>You mainly need to do two things:</p> <ol> <li>Weak-link any frameworks that aren’t present in the 3.2 SDK.</li> <li>Write runtime tests for any APIs that are new to iOS 4.</li> </ol> <p>To do the first, right-click on your target and select “Get Info.” The frameworks are listed in the inspector (under the “General” tab) with a drop-down box next to them that’ll allow you to select “Weak” linking. This ensures that the app will still run if the framework is not present.</p> <p>To do the second, you could do something like the following to test for the new block-based animation in iOS 4:</p> <pre><code>if ([UIView respondsToSelector:@selector(animateWithDuration:animations:)]) { // Your awesome animation code here } else { // Your almost-as-awesome, non-block-based animation code here. } </code></pre> <p>By using introspective methods such as <code>-respondsToSelector:</code>, you can avoid calling something that the currently-running OS doesn’t support.</p> <p>Note also that if you wanted to support iPhone OS 3.0, these same rules would apply.</p> <p>Finally, it's also possible—though not advisable—to do this like so:</p> <pre><code>#ifdef __IPHONE_4_0 // Your iOS 4.0-compatible code here #elif defined(__IPHONE_3_2) // Your iPhone OS 3.2-compatible code here #elif defined(__IPHONE_3_0) // Your iPhone OS 3.0-compatible code here #endif </code></pre> <p>Why is this not advisable? Simple: only the code for the <em>highest</em>-numbered iOS version will be compiled. iPhone apps aren’t compiled separately for separate iOS versions, so to get this to actually <em>work</em>, you would have to release multiple versions of the app.</p>
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    1. POHow should I approach building a Universal iOS app that will include iOS 4 features, even though the iPad doesn't yet run iOS 4?
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    1. USJeff Kelley
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    1. COthanks, Jeff, hugely helpful!
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      1. USBeachRunnerFred
    2. COThis was very insightful, thanks!
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    3. COWhen Build was compiled from iOS 5.0, then code line after #elif defined(__IPHONE_3_2) will never run at any devices with any iOS. This is true?
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