How to save an array of custom struct to NSUserDefault with swift?

Question

I have an custom struct called \'News\' that I want to append into the array to NSUserDefault. But it\'s showing error \"Type \'News\' does not conform to protocol \'AnyObje

Answer 1

WORKING IN SWIFT 3

Following a similar approach to ahruss, I ended up implementing in the following way:

struct MyObject {
    var foo : String
    var bar : String?
}

extension MyObject {
    init?(data: NSData) {
        if let coding = NSKeyedUnarchiver.unarchiveObject(with: data as Data) as? Encoding {
            foo = coding.foo as String
            bar = coding.bar as String?
        } else {
            return nil
        }
    }

    func encode() -> NSData {
        return NSKeyedArchiver.archivedData(withRootObject: Encoding(self)) as NSData
    }

    private class Encoding: NSObject, NSCoding {
        let foo : NSString
        let bar : NSString?

        init(_ myObject: MyObject) {
            foo = myObject.foo
            bar = myObject.bar
        }

        @objc required init?(coder aDecoder: NSCoder) {
            if let foo = aDecoder.decodeObject(forKey: "foo") as? NSString {
                self.foo = foo
            } else {
                return nil
            }
            bar = aDecoder.decodeObject(forKey: "bar") as? NSString
        }

        @objc func encode(with aCoder: NSCoder) {
            aCoder.encode(foo, forKey: "foo")
            aCoder.encode(bar, forKey: "bar")
        }

    }
}

Oh, and to use it just type the following:

let myObject = MyObject(foo: "foo", bar: "bar")
UserDefaults.standard.set(myObject.encode(), forKey: "test")

To fetch it,

let objectData = UserDefaults.standard.object(forKey: "test") as? Data?
guard let storedObject = objectData else {
    return
}
let fetchedObject: MyObject = MyObject(data: storedObject as NSData)