Initializer for conditional binding must have Optional type, not '[String]' - Xcode 8.0 Swift 3.0

Question

I am creating a function that allows me to create a array on VC1 and then I can transfer over the array using "prepare for segue" to VC2. On VC2 I can append an item to the array in VC2 and then transfer over the array back to VC1. My issue is, is that on the line

if let newString = receivedString

(VC1) and erro is comming up that states, "Initializer for conditional binding must have Optional type, not '[String]'"This is my code on VC1:

var receivedString = [String]()



override func viewDidAppear(_ animated: Bool) {



    if let newString = receivedString {

        print(newString)

    }

}

This is my code on VC2:

let stringToPass = "Hello World"



override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    let destinationVC = segue.destination as! ViewController

    destinationVC.receivedString = [stringToPass]

    destinationVC.receivedString.append("DYLAN MURPHY")

}

I am new to Swift so I realise that I may be completely wrong so I appreciate any help that leads me closer to this goal.

Answer 1

I would personally do what you want to do a little bit differently. In VC1 I would add this code:

var username = [String]()

In VC2:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "toSecondViewController" {

        let hello = segue.destination as! ViewController

        hello.username.append(textField.text!)




    }
}

Initializer for conditional binding must have Optional type, not '[String]' - Xcode 8.0 Swift 3.0

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