StackOverflow2013

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primarykey
Id
3857559
data
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0
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0
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1
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CreationDate
2010-10-04T17:20:16.160
FavoriteCount
0
LastActivityDate
2012-12-05T18:06:57.623
LastEditDate
2012-12-05T18:06:57.623
LastEditorUserId
461492
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461492
ParentId
3857485
PostTypeId
2
Score
48
ViewCount
0
LastEditorDisplayName
text
Body
Here's how to listen for such events: <pre><code>// Register for notification when the app shuts down [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myFunc) name:UIApplicationWillTerminateNotification object:nil]; // On iOS 4.0+ only, listen for background notification if(&UIApplicationDidEnterBackgroundNotification != nil) { [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myFunc) name:UIApplicationDidEnterBackgroundNotification object:nil]; } // On iOS 4.0+ only, listen for foreground notification if(&UIApplicationWillEnterForegroundNotification != nil) { [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myFunc) name:UIApplicationWillEnterForegroundNotification object:nil]; } </code></pre> Note: The <code>if(&SomeSymbol)</code> checks ensure that your code will work on iOS 4.0+ and also on iOS 3.x - if you build against an iOS 4.x or 5.x SDK and set the deployment target to iOS 3.x your app can still run on 3.x devices but the address of relevant symbols will be nil, and therefore it won't try to ask for notifications that don't exist on 3.x devices (which would crash the app). Update: In this case, the <code>if(&Symbol)</code> checks are now redundant (unless you really need to support iOS 3 for some reason). However, it's useful to know this technique for checking if an API exists before using it. I prefer this technique than testing the OS version because you are checking if the specific API is present rather than using outside knowledge of what APIs are present in what OS versions.
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1. POiphone 4 sdk : detect return from background mode
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1. PTAnswer
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1. USjhabbott
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1. USjhabbott
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1. POiphone 4 sdk : detect return from background mode
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1. COthanks for quick answer!
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