What's the easiest way to persist data in an iPhone app?

Question

I want to persist a very simple string. For example "abc". What's the easiest way to do this? I don't want to use a SqlLite database.

Answer 1

If it is just one single string NSUserDefaults is probably the easiest way.

// write
[[NSUserDefaults standardDefaults] setObject:@"abc" forKey:@"MY_PERSISTENT_KEY"];

// read
NSString *abc = [[NSUserDefaults standardDefaults] valueForKey:@"MY_PERSISTENT_KEY"];

Answer 2

You can make your objects conform to NSCoding, then write them to a file using an NSKeyedArchiver.

NSString* path = [self pathForDataFile];
NSMutableDictionary* rootObject = [NSMutableDictionary dictionary];
[rootObject setValue: someObject forKey: @"SomeObject"];

// Commit data to file
[NSKeyedArchiver archiveRootObject: rootObject toFile: path];