StackOverflow2013

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2013-10-25T03:54:28.430
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<blockquote> So one of the users in here managed to show me how to pass data from a child view controller to a parent view controller via a string. </blockquote> First you need to establish some hierarchy as to how you get a childViewController from a parentViewController. One way to pass data from childViewController to parentViewController is using a delegate. The other could be using the KVC/KVO protocol. <a href="https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/KeyValueObserving/KeyValueObserving.html" rel="nofollow">https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/KeyValueObserving/KeyValueObserving.html</a> In this you can simply register an observer for the property defined in the childViewController and observe it's changes wherever you want (well, given the hierarchy is satisfied). To save the value. You can simply save it using NSUserDefaults. I don't see any code in your post but you can simply define a key and save the value with NSUserDefaults using: <pre><code>NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; [defaults setObject:sharedString forKey:@"sharedString"]; NSString *sharedStringFromDefaults = [defaults objectForKey:@"sharedString"]; </code></pre> Also, <blockquote> AppDelegate *apiDelegate = [[UIApplication sharedApplication] delegate] </blockquote> Apple requires you to avoid such references in the application. It only constrains the app. Further, the sharedString is not required to be in the AppDelegate. Otherwise the AppDelegate will be filled with almost every other data structure you have shared in the app.
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