Trying to have multiple array items appended to a user-defaults property when in a UITableViewCell?

Question

I have been trying to create a "saved features" tab for my app. I embedded a button into my table view cell (which had a star icon - FavouriteStatusButton). When selected it would append the feature title (the name of the cell) to FavouriteFeatureDataBase.

@IBOutlet weak var FeatureTitle: UILabel!

 var array1: [String] = []
    
    var FavouriteFeatureDataBase = UserDefaults.standard

   
    @IBAction func FavouriteStatusButton(_ sender: UIButton) {

                array1.append(FeatureTitle.text!)
                FavouriteFeatureDataBase.set(array1, forKey: "ArrayOfFilteredFeatures")

...

It only seems to do this one cell at a time - For example I select 4 cells,

1: Name1, 2: Name2, 3: Name3 and 4: Name4

Instead of getting ["Name1", "Name2", "Name3", "Name4"], I'll only get ["Name4"].

I suspect this is because it is in the UITableViewCell but I'm not sure.

You start with an empty array, you add one element, you store that array. It will only have one element. It looks like you are trying to use UserDefaults when you should be using a more appropriate data store, such as Core Data — Paulw11, Commented Feb 7 at 11:51
As @Paulw11 said, the array is initially empty - you need to retrieve the old data first before you save. — Frankie Baron, Commented Feb 7 at 13:17
@Paulw11 I'm using UserDefaults because honestly I don't think I need core data for something this simple. Would it be possible to have advice on how to fix " It will only have one element" — Train Lover, Commented Feb 8 at 8:44
You need to fetch the existing array from defaults, add the new element to that and then store the array in user defaults — Paulw11, Commented Feb 8 at 20:20

Frankie Baron · Accepted Answer · 2025-02-09 10:37:59Z

As mentioned in the comments, you need to retrieve the data first.

You are storing an array - in order to retrieve it, you can use the array(forKey:) method of UserDefaults:

if let savedArray = favouriteFeatureDataBase.array(forKey: "ArrayOfFilteredFeatures") as? [String] {
    array1 = savedArray
}

You should call it somewhere before you append anything to your array, ideally in viewDidLoad() or viewWillAppear(_:):

@IBOutlet weak var featureTitle: UILabel!

var array1: [String] = []
var favouriteFeatureDataBase = UserDefaults.standard

@IBAction func favouriteStatusButton(_ sender: UIButton) {
    if let titleText = featureTitle.text {
        array1.append(titleText)
        favouriteFeatureDataBase.set(array1, forKey: "ArrayOfFilteredFeatures")
    }
}

override func viewDidLoad() {
    super.viewDidLoad()
    
    // Load the saved favourite features when the view is loaded
    loadFavouriteFeatures()
}

func loadFavouriteFeatures() {
    if let savedArray = favouriteFeatureDataBase.array(forKey: "ArrayOfFilteredFeatures") as? [String] {
        array1 = savedArray
    }
}

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