Issue with reading stored array from UserDefaults in Swift 3

Question

I am trying to add Int to an empty Array and then store its data with UserDefaults and then read it , Here is what I am doing :

//create an empty array
var intArray = [Int]()


func addToBookMark(Number:Int) {

    //Add object to array and save it
    intArray.append(Number)

    UserDefaults.standard.set(intArray, forKey: "bookmark")
    UserDefaults.standard.synchronize()


    //Read it
    let array = UserDefaults.standard.array(forKey: "bookmark")  as? [Int] ?? [Int]()
    print(array.description)

}

//Calling the method :
addToBookMark(Number: 30)

The problem is compiler gives me an empty array: [] What is my problem ?

The code you have written won't work in simulator or playground. Check in device. The syntax to store/get array from user defaults changed from swift 3.0 — Sivajee Battina
– Sivajee Battina, Commented May 10, 2017 at 7:18
If you want it to work in simulator and playground also, you need to archieve the array using NSKeyedArchiver and store it. — Sivajee Battina
– Sivajee Battina, Commented May 10, 2017 at 7:21

ankit · Accepted Answer · 2017-05-10 07:36:31Z

2

Your code is perfect, its the issue of simulators. So better try rebooting your Mac.

WWDC Seed: Running multiple iOS simulators can cause NSUserDefaults to not work

Running an iOS 8 or 9 simulator followed by an iOS 10 simulator will cause NSUserDefaults to stop working in the simulator. This can be worked around by rebooting the host Mac.

In case of Playground , there is a radar regarding it as it not works on it since playground doesn't have access to sandbox.

edited May 10, 2017 at 7:36

answered May 10, 2017 at 7:19

ankit

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