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swiftuserdefaults

How can I store an custom class as Data

I want to use UserDefaults, and I think I cant store an Instance of a Struct that I coded by myself, am I right? Now is my question; How can I store an Custom Struct Instance as Data. Thanks for your time Boothosh

Solution

  • Define a custom object which conforms to Codable. A simple example:

    struct MyObject: Codable {
    var something: String
}

    And when you want to save it to UserDefaults, just encode it:

    do {
    let encoded = try JSONEncoder().encode(MyObject(something: "String"))
    UserDefaults.standard.set(encoded, forKey: "kSavedObject")
} catch {
    print(error)
}

    If you want to retrieve it, you can use decode:

    if let data = UserDefaults.standard.data(forKey: "kSavedObject") {
    do {
        let myRetrievedObject = try JSONDecoder().decode(MyObject.self, from: data)
    } catch {
        print(error)
    }
}