在不同的ViewController之间传递数据

Question

我正在尝试使用ViewController在secondViewController和override func prepare(for segue: UIStoryboardSegue, sender: Any?)之间传递数据。

我正在使用控制特斯拉汽车的第三方库。我想要的是，当ViewController的第一个开关打开时，功能startCharging将被执行。我收到此错误：

  

由于数据格式不正确，因此无法读取。

我假设它没有在ViewController之间传递数据。

此代码应在第一个开关打开时打印成功发送的命令。

迅速：

let vehicle = ""
let accessToken = ""
let password = ""
let email = ""
class SecondViewController: UIViewController, UITextFieldDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()
        UserName.delegate = self
        Password.delegate = self
    }

    @IBAction func Enter(_ sender: Any) {
        TextView.text = "Username: \(UserName.text!)\nPassword:\     (Password.text!)"
        let email = (UserName.text!)
        let password = (Password.text!)
        teslaAPI.getAccessToken(email: email, password: password) {
            (httpResponse, dataOrNil, errorOrNil) in
            guard let accessToken = dataOrNil?.accessToken else {
                return
            }
            // Set the accessToken for use with future requests
            self.teslaAPI.setAccessToken(accessToken)
            // Get vehicles
            self.teslaAPI.getVehicles {
                (httpResponse, dataOrNil, errorOrNil) in
                guard let vehicle = dataOrNil?.vehicles.first else {
                    return
                }
                self.teslaAPI.wake(vehicle, completion: {
                    (res, _, err) in
                    guard res else {
                        return
                    }
                })
            }
        }
        self.performSegue(withIdentifier: "nextPage", sender: self)
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        var vc = segue.destination as! ViewController
        vc.finalVehicle = vehicle
        var vc2 = segue.destination as! ViewController
        vc2.finalAccessToken = accessToken
        var vc3 = segue.destination as! ViewController
        vc3.finalEmail = email
        var vc4 = segue.destination as! ViewController
        vc4.finalPassword = password
    }
}

//This is from the other ViewController where I want the data to be      
//passed.
class ViewController: UIViewController {
    var finalVehicle = ""
    var finalAccessToken = ""
    var finalEmail = ""
    var finalPassword = ""
    @IBAction func chargeOffPeakSwitch(_ sender: UISwitch) {
        if (sender.isOn == true)
            DispatchQueue.main.asyncAfter(deadline: .now() + 30.0)  {
                // Change `2.0` to the desired number of seconds.
                // Code you want to be delayed
                //send command to unlock doors
                // let command = Command.unlockDoors
                let command = Command.flashLights
                self.teslaAPI.send(command, to: self.finalVehicle) {
                    response in
                    if response.result {
                        print("Command sent successfully!")
                    }
                }
        }
    }
}

Answer 1

请在git上分享您的代码，以获取更多帮助。但我希望它能起作用

  class SecondViewController: UIViewController, UITextFieldDelegate {

            var vehicle = ""
            var accessToken = ""
            var password = ""
            var email = ""
            override func viewDidLoad() {
                super.viewDidLoad()
                UserName.delegate = self
                Password.delegate = self
            }

            @IBAction func Enter(_ sender: Any) {
                TextView.text = "Username: \(UserName.text!)\nPassword:\     (Password.text!)"
                let email = (UserName.text!)
                let password = (Password.text!)
                teslaAPI.getAccessToken(email: email, password: password) { [unowned self]
                    (httpResponse, dataOrNil, errorOrNil) in
                    guard let accessToken = dataOrNil?.accessToken else {
                        return
                    }
                    self.accessToken = accessToken
                    // Set the accessToken for use with future requests
                    self.teslaAPI.setAccessToken(accessToken)
                    // Get vehicles
                    self.getVehicle()

                }
            }
            func getVehicle() {
                self.teslaAPI.getVehicles { [unowned self]
                     (httpResponse, dataOrNil, errorOrNil) in
                    guard let vehicle = dataOrNil?.vehicles.first else {
                        return
                    }
                    self.vehicle =  vehicle
                    self.performSegue(withIdentifier: "nextPage", sender: self)

                    self.invokeWake(vehicle: vehicle)
                }
            }
            func invokeWake(vehicle:String) {
                self.teslaAPI.wake(vehicle, completion: {
                    (res, _, err) in
                    guard res else {
                        return
                    }
                })
            }

            override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
                var vc = segue.destination as! ViewController
                vc.finalVehicle = vehicle
                vc.finalAccessToken = accessToken
                vc.finalEmail = email
                vc.finalPassword = password
            }
        }

        //This is from the other ViewController where I want the data to be
        //passed.
        class ViewController: UIViewController {
            var finalVehicle = ""
            var finalAccessToken = ""
            var finalEmail = ""
            var finalPassword = ""
            @IBAction func chargeOffPeakSwitch(_ sender: UISwitch) {
                if (sender.isOn == true)
                DispatchQueue.main.asyncAfter(deadline: .now() + 30.0)  {
                    // Change `2.0` to the desired number of seconds.
                    // Code you want to be delayed
                    //send command to unlock doors
                    // let command = Command.unlockDoors
                    let command = Command.flashLights
                    self.teslaAPI.send(command, to: self.finalVehicle) {
                        response in
                        if response.result {
                            print("Command sent successfully!")
                        }
                    }
                }
            }
        }