Question

Is it possible to save an integer array using NSUserDefaults on the iPhone? I have an array declared in my .h file as: int playfield[9][11] that gets filled with integers from a file and determines the layout of a game playfield. I want to be able to have several save slots where users can save their games. If I do:

NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults]; [prefs setObject: playfield forKey: @'slot1Save']; 

I get a pointer error. If it’s possible to save an integer array, what’s the best way to do so and then retrieve it later?

Thanks in advance!

Answer 1

You can save and retrieve the array with a NSData wrapper

ie (w/o error handling)

Save

NSData *data = [NSData dataWithBytes:&playfield length:sizeof(playfield)]; [prefs setObject:data forKey:@'slot1Save']; 

Load

NSData *data = [prefs objectForKey:@'slot1Save']; memcpy(&playfield, data.bytes, data.length);