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    <p><strong>Edit:</strong><br> If you are targeting iOS6 or above you can use <code>[[NSFileManager defaultManager] ubiquityIdentityToken];</code>. For usage example please refer <a href="https://stackoverflow.com/a/23557492/149008">@Dj S' answer</a> :).<br> It is faster and easier than the original solution which was meant for people targeting iOS5 and above</p> <p><strong>Original Answer</strong><br> As documented in <a href="https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSFileManager_Class/index.html#//apple_ref/occ/instm/NSFileManager/URLForUbiquityContainerIdentifier:" rel="nofollow noreferrer">iOS App programming guide - iCloud Storage</a>. That can be checked by asking the ubiquity container URL to the file manager :)</p> <p>As long as you supply a valid ubiquity container identifier below method should return YES</p> <pre><code>- (BOOL) isICloudAvailable { // Make sure a correct Ubiquity Container Identifier is passed NSURL *ubiquityURL = [[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:@"ABCDEFGHI0.com.acme.MyApp"]; return ubiquityURL ? YES : NO; } </code></pre> <p>However, I've found that <code>URLForUbiquityContainerIdentifier:</code> might take several seconds the very first time within a session (I used it in iOS5 so things might be different now). I remember using something like this:</p> <pre><code>dispatch_queue_t backgroundQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); dispatch_async(backgroundQueue,^{ BOOL isAvailable = [self isICloudAvailable] /* change to the main queue if you want to do something with the UI. For example: */ dispatch_async(dispatch_get_main_queue(),^{ if (!isAvailable){ /* inform the user */ UIAlertView *alert = [[UIAlertView alloc] init...] [alert show]; [alert release]; } }); }); </code></pre>
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    1. COexcellent solution.
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    2. COUnfortunately that link to the Apple doc doesn't work. You can search for URLForUbiquityContainerIdentifier here though: https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSFileManager_Class/Reference/Reference.html
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    3. COApple constantly changes locations, link is updated. :)
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