ios - Pass label text from one view controller to another using segues only if button (checkbox) is selected

Question

试图将标签文本从一个 View Controller 传递到另一个 View Controller ，但我只希望传递选定标签中的文本。通过选中旁边的复选框来选择标签。我的尝试如下。我没有收到任何错误，但我没有在第二个 VC 中看到文本。它不必是标签上的文本我只需要传递与所选复选框对应的文本。我试过只设置一个变量。这是我第一次尝试编程，所以我可能会遗漏一些非常简单的东西。简而言之，需要能够在“if”语句中执行 segue 准备。

第一位风投

           let EnSoString = "Energy Source"
       @IBAction func EnergySourceBut(_ sender: UIButton) {

        if sender.isSelected {
            sender.isSelected = false
        } else {
            sender.isSelected = true;do {
                func prepare(for segue: UIStoryboardSegue, sender: Any){
                    let receivevc1 = segue.destination as! step4ViewController
                     receivevc1.EnergySourceLab = EnSoString
            }
        }
    }
}

第二个VC

    //name
var EnergySourceLab:String?

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
    // received info
    if  let receivedEnergySourceLab = EnergySourceLab {
        EnergySourceLab1.text = receivedEnergySourceLab}

}

Selecting checkbox Code for prepare for segue within button is.selected

Answer 1

试试这个:

第一位风投

       let EnSoString = "Energy Source"

   @IBAction func EnergySourceBut(_ sender: UIButton) {

    if sender.isSelected {
        sender.isSelected = false
    } else {
             self.performSegue(withIdentifier: "segueID", sender: self) 
    }
}



override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "segueID" {
    if let vc = segue.destinationViewController as? YourSecondVC {
        vc.EnergySourceLab = EnSoString
    }
}

第二个VC

//name
var EnergySourceLab:String?

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
    // received info
    if  let receivedEnergySourceLab = EnergySourceLab {
        EnergySourceLab1.text = receivedEnergySourceLab}

}