While running your app in the simulator, it's often useful to be able to open your app document directory to inspect data or drop in your own test data. Just drop this into -application:didFinishLaunchingWithOptions: and print it out:

NSString* docPath = [[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask][0].path;

Or in Swift:

let docPath = NSFileManager.defaultManager().URLsForDirectory(NSSearchPathDirectory.DocumentDirectory, inDomains: NSSearchPathDomainMask.UserDomainMask).last?.path

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