使用NSUserDefaults（Swift）在ViewController和TableVC之间传递数据

Question

How to pass the state of a NSUserDefault between several Classes in Swift ? In this case I want to pass this state between one TableViewController , where you change the state on the switch, and one initial VC. Here is a little model to understand...

I used this to set the state with the switch:

@IBAction func changeTouchIDState(sender: AnyObject) {

    if TouchIDSwitch.on {

        NSUserDefaults.standardUserDefaults().setBool(true, forKey: "State")

    } else {

        NSUserDefaults.standardUserDefaults().setBool(false, forKey: "State")

    }
}

If the state = true, the initial VC should ask about the Authentication.

Thanks!

Answer 1

Your question need little more explanation, I don't understand why you want to pass the value as you are already storing in NSUserDefaults which you can access in any class of your app.

As per my understanding to your problem I'm suggesting the solution:

As you already storing State in NSUserDefaults so before presenting initial VC check NSUserDefaults.standardUserDefaults().boolForKey("State") if its true, ask authentication otherwise don't.

Answer 2

After setting the bool, you should synchronise:

NSUserDefaults.standardUserDefaults().synchronize()

Then, you can access that value with:

func boolForKey(_ defaultName: String) -> Bool