Casting struct to NSUserDefaults in Swift?

Question

Is there a way I can cast this Swift data set in someway to a form that is acceptable to NSUserDefauts? i.e. NSObject NSSet? (p.s. I realize NSUserDefaults isn't for this type of data, but I'm just testing)

struct Users {
        var name: String = ""
        var stores: [Store]
    }

    struct Store {
        var name: String = ""

        var clothingSizes = [String : String]()

    }

    init() {
        let userDefaults = NSUserDefaults.standardUserDefaults()

        if let usersPeople = userDefaults.valueForKey("Users") as?

Pretty sure your are limited in what types you can store in Swift: http://stackoverflow.com/a/2315972/620197 https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSUserDefaults_Class/index.html#//apple_ref/occ/instm/NSUserDefaults/setObject:forKey: — Mike D, Jun 04 '15 at 15:31
Yes, the examples I've seen always store arrays or arrays of arrays in NSUserDefaults Core Data etc....my data structure, the Store object particularly, is a string associated with an array of a dictionary, which is what I can't figure out how to store in a non-Swift API like NSUserDefults. — GarySabo, Jun 04 '15 at 17:16
@PSUSabes but, NSUserDefaults has Swift API. You need to save and then read your data, right? Then you just need to use, `setObject:forKey:` for setting and `objectForKey` for reading. Look at my answer and try it. — Dima Deplov, Jun 04 '15 at 21:36
Thanks @flinth but I get NSUSerDefaults does not have a member named setDictionary — GarySabo, Jun 04 '15 at 21:41
@PSUSabes yes, that's why you can use `setObject:forKey`. I edit my question — Dima Deplov, Jun 04 '15 at 21:43

Dima Deplov · Accepted Answer · 2015-06-04T21:44:58.303

2

I think you can use Dictionary. You'll need to make method to wrap data to struct and vice versa.

For example:

var users : [String: AnyObject]()
users["name"] = "SomeName"
users["stores"] = yourStoreArray
NSUserDefaults.standardUserDefaults().setObject(users, forKey: "Users")

something like that.

And when you need to get struct

if let myDictionaryFromUD = userDefaults.objectForKey("Users") as? [String:AnyObject]{
   self.users = Users(myDictionaryFromUD["name"], stores: myDictionaryFromUD["stores"] as! [Store]) 

}

I aslo assume that you will save to userDefaults array of Users. In this case, you will save [[String: AnyObject]] but mechanics the same.

edited Jun 04 '15 at 21:44

answered Jun 04 '15 at 15:35

Dima Deplov

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stores isn't just an array though, it has a nested dictionary in it? – GarySabo Jun 04 '15 at 17:12
@PSUSabes in my example stores is an array. My example is based on your question and stores is array of Store struct in your case. It can be Dictionary too. – Dima Deplov Jun 04 '15 at 17:44

score 0 · Answer 2 · answered Jun 04 '15 at 15:35

I don't know that this is the best way to do this but you can try this.

struct Users {
        var name: String = ""
        var stores: [Store]
    }

    struct Store {
        var name: String = ""

        var clothingSizes = [String : String]()

    }

var Advert = [Users]()

init() {
        NSUserDefaults.standardUserDefaults().setObject(Advert[0].name, forKey: "NameYouWant")
}

Casting struct to NSUserDefaults in Swift?

2 Answers2