Securing a Dictionary

Securing a more complex data type such as a dictionary follows the same approach taken to secure the PIN in earlier sections. The Keychain wrapper only allows for the storage of strings; to secure a dictionary, it is first turned into a string. The approach chosen for the sample code is to first save the dictionary to a JSON string using the NSJSONSerialization class. (See Chapter 7, “Working with and Parsing JSON,” for more info.)

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NSMutableDictionary *secureDataDict = [[[NSMutableDictionary alloc] init] autorelease];NSError *error = nil;if(numberTextField.text)    [secureDataDict setObject:numberTextField.text forKey:@"numberTextField"];if(expDateTextField.text)    [secureDataDict setObject ...

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