使用展开segue发送值

Question

你好我们正在尝试使用unwind segue使用按钮发送值 无论何时我这样做

 @IBAction func SENDBTN(_ sender: Any) {
            self.performSegue(withIdentifier: "unwindToAdd", sender: self)

        func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
            if let vc = segue.destination as? AddViewController {
                vc.longlat = self.longlat

            }
        }
    }

longlat变量的值在addViewController中不会改变 仍然没有。

如果有人帮助我会感激的

Answer 1

您是否耐心搜索Google？

@IBAction func sendData(_ sender: Any) {
         self.performSegue(withIdentifier: "showData", sender: self)        
    }

override func prepare(for segue: UIStoryboardSegue, sender: Any?){
        if (segue.identifier == "showData"){
                let vc = segue.destination as! ProfilePage
            }
        }

Answer 2

看起来你的代码错了，所以让我们试试下面的代码并检查addViewController中longlat变量的值。

@IBAction func SENDBTN(_ sender: Any) {
            self.performSegue(withIdentifier: "unwindToAdd", sender: self)        
    }

func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
            if let vc = segue.destination as? AddViewController {
                //vc.longlat = self.longlat
                print("entered !!!")
                vc.longlat = "hard code some value"
            }
        }