How to save NSMutablearray in NSUserDefaults

Question

I have two NSMutableArray\'s. They consist of images or text. The arrays are displayed via a UITableView. When I kill the app the data within the <

Answer 1

In Swift 3, for an NSMutableArray, you will need to encode/decode your array to be able to save it/ retrieve it in NSUserDefaults :

Saving

//Encoding array
let encodedArray : NSData = NSKeyedArchiver.archivedData(withRootObject: myMutableArray) as NSData

//Saving
let defaults = UserDefaults.standard
defaults.setValue(encodedArray, forKey:"myKey")
defaults.synchronize()

Retrieving

//Getting user defaults
let defaults = UserDefaults.standard

//Checking if the data exists
if defaults.data(forKey: "myKey") != nil {
   //Getting Encoded Array
   let encodedArray = defaults.data(forKey: "myKey")

   //Decoding the Array
   let decodedArray = NSKeyedUnarchiver.unarchiveObject(with: encodedArray!) as! [String]
}

Removing

//Getting user defaults
let defaults = UserDefaults.standard

//Checking if the data exists
if defaults.data(forKey: "myKey") != nil {

    //Removing the Data
    defaults.removeObject(forKey: "myKey")

}