Why does NSUserDefaults always return nil?

Question

I'm testing this code in playground. What I don't understand is, why is result always nil? Thanks for help

var value: String!
let key = "key24"

if value == nil{
    value = "hehe"
    let valueNS = NSString(string: value)


    NSUserDefaults.standardUserDefaults().setValue(valueNS, forKey: key)
}



var result: AnyObject? = NSUserDefaults.standardUserDefaults().objectForKey(key)
print(result)

Answer 1

There's something screwy going on with playgrounds, especially with Xcode 7. I can get a variation on your code to work on Xcode 6.4, with a few changes:

You should use setObject:forKey not setValue:forKey.

You should cal synchronize after changing defaults.

Here's the modified code (which works in Xcode 6.4, although testing it in Xcode then causes Xcode 6.4 to fail as well.)

//: Playground - noun: a place where people can play

import UIKit

var value: String!
let key = "key24"


if value == nil
{
  value = "hehe"
  print("value was nil!")
  NSUserDefaults.standardUserDefaults().setObject(value, forKey: key)
  NSUserDefaults.standardUserDefaults().synchronize()
}

var result = NSUserDefaults.standardUserDefaults().stringForKey(key)
print(result)