Question

我几乎已经完成了我的应用，并且想尝试使用UIPicker选择其他UIViewController，即FirstViewController，SecondViewController，ThirdViewController。去年我确实曾尝试找到一种解决方案，但找不到，所以我避免使用UIPicker。当我尝试使用UIPicker时发生错误，向上滚动它可以正常工作，因此在UIPicker上选择任何东西都可以，但是如果我不小心向下滚动到实际上没有任何选择的地方，则会崩溃，并且“没有提示”错误代码为“ CDM RegulationsSegue”的错误，现在我的第一个Segue称为Segue，这是我可以使其正常工作的唯一方法，但是如果向下滚动会崩溃，如果我将其命名为RegulationsSegue，它将无法运行。请在下面查看我的代码

描述我如何解决此问题的最简单方法是，我的Segues标识符命名正确，并且无法运行，但是如果我将我的第一个Segue命名为Segue则可以正常工作。但在UIPicker上意外滚动时仍会崩溃

class PaperWorkViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
    @IBOutlet weak var pickerView: UIPickerView!
    var pickerData = ["CDM Regulations","CDM Duties","Request for Info"]
    var selectedDetail = ""

    override func viewDidLoad() {
        super.viewDidLoad()

        pickerView.delegate = self
        pickerView.dataSource = self
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func continueButtonPressed(_ sender: AnyObject) {
        self.performSegue(withIdentifier: "\(selectedDetail)Segue", sender: nil)

    }
    // The number of columns of data
    func numberOfComponents(in pickerView: UIPickerView) -> Int {

        return 1
    }

    // The number of rows of data
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return pickerData.count
    }

    // The data to return for the row and component (column) that's being passed in
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return pickerData[row]
    }
    //Called when the user changes the selection...
    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        selectedDetail = pickerData[row]
    }
    // Capture the picker view selection
    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        // This method is triggered whenever the user makes a change to the picker selection.
        // The parameter named row and component represents what was selected.

        }
    }

UK [1886：403119] ***由于未捕获的异常'NSInvalidArgumentException'而终止应用程序，原因：'接收器（）没有标识为'CDM RegulationsSegue的segue' ***首先抛出调用堆栈：

如果我将Segue CDM法规命名为Segue，它将无法运行。

如果在UIPicker上向下滚动，应用程序崩溃

0 个答案: