Question

I’m new to iOS 6 and just wanted to post a question regarding the use of NSDictionary or MutuableDictionary.

I’m used to the Android method ShardPreferences where I can write data in key/value format and overwrite etc. etc. Any SharedPreferences file can also be accessed from any scene, like a global class.

Am I looking at the right classes for what I want to do?

Once created can the content be accessed from any scene/class?

Thanks,

Answer 1

you can use NSUserDefaults

With the NSUserDefaults class, you can save settings and properties
related to application or user data.

For example, you could save a profile image set by the user or a default color scheme for the application.

The objects will be saved in what is known as the iOS “defaults
system”. The iOS defaults system is available throughout all of the
code in your app, and any data saved to the defaults system will
persist through application sessions. This means that even if the user
closes your application or reboots their phone, the saved data will
still be available the next time they open the app!

With NSUserDefaults you can save objects from the following class types:

 - NSData, NSString, NSNumber, NSDate, NSArray, NSDictionary

If you want to store any other type of object, such as a UIImage, you will typically need to archive it or wrap it in an instance of NSData, NSNumber, or NSString.

Example

NSUserDefaults *sharedPref = [NSUserDefaults standardUserDefaults];
[sharedPref setObject:@"TextToSave" forKey:@"keyToLookupString"];
NSString *myString = [sharedPref stringForKey:@"keyToLookupString"];