ios - fatal error : Index out of range in swift while taking options from uipicker

Question

我有 3 个文本字段，可以选择性别、国家、州。我正在使用 UIPicker 从 UIPicker 获取输入值。但是现在，当我按性别 UITextField 打开 UIPickerenter code here 时，UIPickerenter code here 显示没有数据。但是我为国家、州使用的是相同的 UIPicker。那个时候它用 UIPicker 显示两个国家的数据，状态文本字段。谁能帮帮我。如何解决这个问题。

错误:

fatal error: Index out of range

如果我在 uipicker 选项中按下，只会崩溃。

我的代码:

我在这个类文件中遇到了崩溃:

import Foundation

import SwiftCountryPicker

class DataPicker: NSObject, UIPickerViewDataSource, UIPickerViewDelegate {

    var dataPicker: UIPickerView!
    var inputText:UITextField!
    var parent:UIViewController!
    var pickerData: [String]!
    var feetStr = String()
    var inchStr = String()

    private var _selectedValue: String!

    var selectedvalue: String {
        return _selectedValue ?? String()
    }

    func showPicker(parent:UIViewController,inputText:UITextField, data: [String], selectedValueIndex: Int){

        self.inputText = inputText
        self.parent = parent
        pickerData = data

        if dataPicker == nil {
            dataPicker = UIPickerView(frame: CGRectMake(0,0,parent.view.frame.size.width, 216))
            dataPicker.backgroundColor = UIColor.whiteColor()
            dataPicker.dataSource = self
            dataPicker.delegate = self
            dataPicker.selectRow(selectedValueIndex, inComponent: 0, animated: true)
            _selectedValue = pickerData.count > 0 ? pickerData[selectedValueIndex] : ""
        }
        inputText.inputView = dataPicker

        // ToolBar
        let toolBar = UIToolbar()
        toolBar.barStyle = .Default
        toolBar.translucent = true
        toolBar.tintColor = UIColor(hex: "B12420")
        toolBar.backgroundColor = UIColor.whiteColor()
        toolBar.sizeToFit()

        // Adding Button ToolBar
        let doneButton = UIBarButtonItem(title: "Done", style: .Plain, target: self, action: #selector(DataPicker.doneClick))
        let spaceButton = UIBarButtonItem(barButtonSystemItem: .FlexibleSpace, target: nil, action: nil)
        let cancelButton = UIBarButtonItem(title: "Cancel", style: .Plain, target: self, action: #selector(DataPicker.cancelClick))
        toolBar.setItems([cancelButton, spaceButton, doneButton], animated: false)
        toolBar.userInteractionEnabled = true
        inputText.inputAccessoryView = toolBar

    }

    func doneClick() {
        inputText.text = _selectedValue
        inputText.resignFirstResponder()
    }
    func cancelClick() {
        inputText.resignFirstResponder()
    }




    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return 1
    }
    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return pickerData.count
    }
    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return pickerData[row]
    }

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {

        _selectedValue = pickerData[row]
    }

}

在这一行中:

func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {

        _selectedValue = pickerData[row]
    }

我的文本字段委托(delegate)用于按下 texfield:

extension UserInfoViewController:UITextFieldDelegate{

    func textFieldDidBeginEditing(textField: UITextField) {

        selectedText = textField

else if  textField == genderss {
            ctDataPicker = DataPicker()
            let indexPos = genders.indexOf(genderss.text!) ?? 0
            ctDataPicker.showPicker(self, inputText: textField, data: genders,selectedValueIndex: indexPos)
        }

}
}

Answer 1

UIPickerViewDataSource 方法 didSelectRow 在 Swift 4 中发生了变化:

func numberOfComponents(in pickerView: UIPickerView) -> Int {
    return 1
}

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return pickerData.count
}

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    return pickerData[row]
}

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    TextField.text = myPickerData[row]
}

尝试将崩溃 _selectedValue 的行更改为文本字段示例

TextField.text = myPickerData[行]

检查 Apple Documentation在 UIPickerView 上。