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copied!<p>First off, as mentioned by others here, <code>applicationDidEnterBackground:</code> is probably a better place to do this. Secondly, your view controller isn't going to get this call all on it's own: it's a <code>UIApplicationDelegate</code> protocol call, and your view controller isn't one of those.</p> <p>What you want to do is make your view controller receive the <code>UIApplicationDidEnterBackgroundNotification</code> notification. <a href="https://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIApplicationDelegate_Protocol/Reference/Reference.html#//apple_ref/occ/intfm/UIApplicationDelegate/applicationDidEnterBackground%3a" rel="nofollow">The UIApplicationDelegate reference</a> says:</p> <blockquote> <p>The application also posts a UIApplicationDidEnterBackgroundNotification notification around the same time it calls this method to give interested objects a chance to respond to the transition.</p> </blockquote> <p>So in your view controller you want to do something like this (warning: typed this code right into the webpage, didn't try to compile it):</p> <pre><code>- (void) viewDidLoad { [super viewDidLoad]; // Register for notification. [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidEnterBackground:) name:UIApplicationDidEnterBackgroundNotification object:nil]; } - (void) viewDidUnload { [[NSNotificationCenter defaultCenter] removeObserver:self]; } - (void) applicationDidEnterBackground:(NSNotification*)notification { // Do your plist saving here. } </code></pre>

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