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Editorial Team
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Asked: 2026-05-28T05:27:30+00:00

I am new to iOS 5 programming so I’m sure that these are basic

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I am new to iOS 5 programming so I’m sure that these are basic questions for the experienced folks.

  1. I have a log in form that creates a unique session string. How can I maintain string in a way that it will be usable on all view controllers throughout the application just for that session?
  2. How can I store a series of strings (maybe 1 or 2 of them) so that they will be available to the application on subsequent application loads? In other words, how can I maintain a default string that can be used throughout the lifetime of the application on any given device?
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  1. Editorial Team

    First, this can be stored on the Application Delegate (which is accessible like below from anywhere within your application:

    YourAppDelegate.h

    - (NSString *)uniqueSessionString;

    View Controller:

    NSString *uniqueString = [(YourAppDelegate *)[[UIApplication sharedApplication] delegate] uniqueSessionString];

    Second, to save this information look at NSUserDefaults. This information will persist even after the application closes. Here is a tutorial on using it here:

    http://mobile.tutsplus.com/tutorials/iphone/nsuserdefaults_iphone-sdk/

    If you need to maintain this string for all of a user’s devices, then you need to look at the NSUbiquitousKeyValueStore (part of iCloud). You also can use both of these methods together. See this SO question:

    How to use NSUbiquitousKeyValueStore and NSUserDefaults together

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