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POChecking whether UI_USER_INTERFACE_IDIOM exists at runtime
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  1. POChecking whether UI_USER_INTERFACE_IDIOM exists at runtime
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    copied!<p>I am working on a universal app that should be able to run on iPad and iPhone. The Apple iPad docs say to use <code>UI_USER_INTERFACE_IDIOM()</code> to check if I am running on iPad or iPhone, but our iPhone is 3.1.2 and will not have <code>UI_USER_INTERFACE_IDIOM()</code> defined. As such, this code breaks:</p> <pre><code>//iPhone should not be flipped upside down. iPad can have any - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) { return YES; //are we on an iPad? } else { return interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown; } } </code></pre> <p>In Apple's <a href="http://developer.apple.com/iphone/library/documentation/DeveloperTools/Conceptual/cross_development/Using/using.html#//apple_ref/doc/uid/20002000-1114537-BABHHJBC" rel="nofollow noreferrer">SDK Compatibility Guide</a> they suggest doing the following to check if the function exists:</p> <pre><code>//iPhone should not be flipped upside down. iPad can have any - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { if(UI_USER_INTERFACE_IDIOM() != NULL &amp;&amp; UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) { return YES; //are we on an iPad? } else { return interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown; } } </code></pre> <p>This works, but results in the compiler warning: "Comparison between pointer and integer." After digging around I figured out that I can make the compiler warning disappear with the following cast to <code>(void *)</code>:</p> <pre><code>//iPhone should not be flipped upside down. iPad can have any - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { if((void *)UI_USER_INTERFACE_IDIOM() != NULL &amp;&amp; UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) { return YES; //are we on an iPad? } else { return interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown; } } </code></pre> <p>My question is this: Is the last code block here okay/acceptable/standard practice? I couldn't find anyone else doing something like this with quick searching which makes me wonder if I missed a gotcha or something similar.</p> <p>Thanks.</p>
 

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