How do I set NSUserDefault settings as Instance Variables?

Question

When I try to just set a constant based on the settings like below, it results in Optional("value").

let accesstoken = NSUserDefaults.standardUserDefaults().stringForKey("accessToken")
let userId = NSUserDefaults.standardUserDefaults().stringForKey("userId")

If I do it like the below, I get an error saying variable used within its own initial value. I can't seem to win here. What am I doing wrong?

var accesstoken = String()
var userId = Int()


if let atString = NSUserDefaults.standardUserDefaults().stringForKey("accessToken") {
    accesstoken = atString
}

if let userIdString = NSUserDefaults.standardUserDefaults().stringForKey("userId") {
    userId = userIdString
}

Leo Dabus · Accepted Answer · 2015-07-10 22:52:45Z

1

You can achieve what you want with a read only computed property combined with the nil coalescing operator "??". Try like this:

var accessToken: String {
    return NSUserDefaults().stringForKey("accessToken") ?? ""
}

var userId: String {
    return NSUserDefaults().stringForKey("userId") ?? ""
}

or if you need an Int for your userID

var userId: Int {
    return NSUserDefaults().integerForKey("userId")
}

edited Jul 10, 2015 at 22:52

answered Jul 10, 2015 at 22:18

Leo Dabus

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3 Comments

Nathan McKaskle Over a year ago

What does the ?? "" part at the end do?

Leo Dabus Over a year ago

it checks if the key has a value and if there is no value instead of returning nil you can define a default value for the key

Leo Dabus Over a year ago

developer.apple.com/library/prerelease/ios/documentation/Swift/…

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