CODEWITHSUNDEEP
iosswiftnsuserdefaults
victorpulak
victorpulak

Reputation: 131

Save multiple values in NSUserDefaults key

Is there any way to save multiple values for the same key in NSUserDefaults? I seem to only be saving the last value, even though I have multiple values for the "Day" key.

Day:

for days in results! {
    let nD = DayClass()
    nD.dayOfTheWeek = days[“D”] as! String
    let defaults = NSUserDefaults.standardUserDefaults()
    defaults.setObject(nD.dayOfTheWeek, forKey: “Day”)
}

I've tried creating an array as a possible solution, but I'm still only getting the last value when I log it in my console:

var emptyArray = [String]()
emptyArray.append(dayOfTheWeek)
print("Array: \(emptyArray)")
print("ArrayCount: \(emptyArray.count)")

Upvotes: 1

Views: 3337

Answers (3)

Pradeep K
Pradeep K

Reputation: 3661

You can do this. First check if there is already an Day array in the prefs. If so then add the new dayOfTheWeek to that array and store it. Else create a new one and store it.

for days in results! {
    let dayOfTheWeek = days["D"] as! String
    //check if there is already an existing Day array in prefs
    if var existingArr = NSUserDefaults.standardUserDefaults().arrayForKey("Day") as? [String] {
        //if so append the new value to that array and store it
        if existingArr.contains(dayOfTheWeek) == false {
            existingArr.append(dayOfTheWeek)
            let defaults = NSUserDefaults.standardUserDefaults()
            defaults.setObject(existingArr, forKey: "Day")
            defaults.synchronize()
        }
    } else {
        //create a new array and store it
        let defaults = NSUserDefaults.standardUserDefaults()
        defaults.setObject([dayOfTheWeek], forKey: "Day")
        defaults.synchronize()
    }
}

Upvotes: 1

Muzahid
Muzahid

Reputation: 5186

let daysArray = ["Sat", "Sun", "Mon", "Tu", "Wed", "Th", "Fri"]
// Set Array Into NSUserDefaults
NSUserDefaults().setObject(daysArray, forKey: "day")

// Retrive Array from NSUserDefaults
if let daysOfWeek = NSUserDefaults().arrayForKey("day") as? [String] {
  for item in daysOfWeek {
    print(item)
  }
}

Upvotes: 1

Akash
Akash

Reputation: 491

   var food: [String] 
                            {


   get {

        if let returnValue = 
NSUserDefaults.standardUserDefaults().objectForKey("food") as? [String] {
            return returnValue
        } else {
            return ["muesli", "banana"] //Default value
        }
    }
    set {
        NSUserDefaults.standardUserDefaults().setObject(newValue, forKey: "food")
        NSUserDefaults.standardUserDefaults().synchronize()
    }
}

override func viewDidLoad() {
    super.viewDidLoad()

    print(food) // prints: ["muesli", "banana"] (at first launch)

    food = ["cake"]
    print(food) // prints: ["cake"]

    food += ["spaghetti"]
    print(food) // prints: ["cake", "spaghetti"]

    food = []
    print(food) // prints: []

    NSUserDefaults.standardUserDefaults().setObject(nil, forKey: "food")
    print(food) // prints: ["muesli", "banana"]
}

Upvotes: 0

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