(Swift) Storing and retrieving Array to NSUserDefaults

Question

I am trying to store an array to NSUserDefaults and retrieve the array when needed to populate a UITableView.

Currently I am using:

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Answer 1

Saving and Retrieving a String array to UserDefaults

Save array

let array = ["horse", "cow", "camel", "sheep", "goat"]

let defaults = UserDefaults.standard
defaults.set(array, forKey: "SavedStringArray")

Retrieve array

let defaults = UserDefaults.standard
let array = defaults.object(forKey: "SavedStringArray") as? [String] ?? [String]()

See more at How to save user settings using NSUserDefaults

Answer 2

Latest swift3 version to store array of data into userdefaults and get that array of data using keys

    let nameArray = ["Ramu","JAGAN","Steve","Swift"]
    let namesArrayData = NSKeyedArchiver.archivedData(withRootObject: nameArray)
    UserDefaults.standard.set(namesArrayData, forKey: "arrayData")

RetriveData

        let retriveArrayData= UserDefaults.standard.object(forKey:  "arrayData") as? NSData

   if let retriveArrayData= namesArrayData{
  let retriveArray = NSKeyedUnarchiver.unarchiveObject(with: namesArraydata as Data) as? [nameArray]
  print(retriveArray )
}

Answer 3

This has been changed in swift 3. Note that this works with device but not playground or simulator

//store the array
let array = ["horse", "cow", "camel", "sheep", "goat"]

let defaults = UserDefaults.standard

defaults.setValue(array, forKey: "history")

defaults.synchronize()

//Retrieve the array
if((UserDefaults.standard.array(forKey: "history")) != nil){
    let historyWords = (UserDefaults.standard.array(forKey: "history") as? [String])!
    print(historyWords)
}

Answer 4

What are you storing in the array?

If it's objects it won't work, if It's just strings or numbers then it should be fine.

Next steps you take should be to turn on exception breakpoints and maybe println() everything you can so you can pinpoint the exact whereabouts of the problem.

As a shot in the dark I would suggest maybe (identity.text!) is coming out as nil

Also you should probably change it to this

if let tabledata: NSArray = NSUserDefaults.standardUserDefaults().stringForKey("\(identity.text!)listA"){

    myArray = [tabledata!]

    tableView.reloadData()
}

This will make the code not even try to run unless there is a value it can use

Answer 5

Here are the way that you can store and retrieved array of object with help of NSKeyArchive.

To Store array to NSUserDefault.

let placesData = NSKeyedArchiver.archivedData(withRootObject: placesArray)
UserDefaults.standard.set(placesData, forKey: "places")

To Retrieved array from NSUserDefault.

let placesData = UserDefaults.standard.object(forKey: "places") as? NSData

if let placesData = placesData {
    let placesArray = NSKeyedUnarchiver.unarchiveObject(with: placesData as Data) as? [Place]
    print(placesArray)
}

Hope this help you.

Answer 6

Store into User Default:

let arrayFruit = ["Apple","Banana","Orange","Grapes","Watermelon"]    
 //store in user default
UserDefaults.standard.set(arrayFruit, forKey: "arrayFruit")

Retrieving array from User Defaults:

if let arr = UserDefaults.standard.array(forKey: "arrayFruit") as? [String]{
    print(arr)
}