ios - 在同一 View 中集成多个选择器 View 时遇到问题

Question

我试图在一个 View 上设置两个选取器 View ，但我不想显示轮子，我只想在单击特定文本框时弹出轮子。我可以让它适用于一个 Pickerview，但是当我尝试添加第二个 Pickerview 时，pickerview 不再工作。

我尝试过使用“标签”，但由于我没有明确使用 UIPickerView!，所以我认为不能使用标签。

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate{

    @IBOutlet weak var cornerText: UITextField!
    @IBOutlet weak var brandText: UITextField!


    //    PICKER VIEW CODE

    let Corner = ["LF", "RF", "RR", "LR", "5th"]
    let Brand = ["Brand1", "Brand2", "Brand3", "Brand4", "Brand5"]


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

    func pickerView(_ cornerPickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        if cornerText.isEditing{
            return Corner.count
        }
        else if brandText.isEditing{
            return Brand.count
        }
        else {
            return 0
        }
    }

    func pickerView(_ cornerPickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        if cornerText.isEditing{
            return Corner[row]
        }
        else if brandText.isEditing{
            return Brand[row]
        }
        else {
            return nil
        }
    }
    var cornerIndex: Int!
    var brandIndex: Int!

    func pickerView(_ cornerPickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        if cornerText.isEditing{
            cornerText.text = Corner[row]
            cornerIndex = row
        }
        else if brandText.isEditing{
            brandText.text = Brand[row]
            brandIndex = row
        }
        else{
            return
        }
    }

    func createPickerView(){


        if cornerText.isEditing{
            let cornerPickerView = UIPickerView()
            cornerPickerView.delegate = self
            cornerText.inputView = cornerPickerView
        }
        else if brandText.isEditing{
            let cornerPickerView = UIPickerView()
            cornerPickerView.delegate = self
            brandText.inputView = cornerPickerView
        }
        else {
            return
        }
    }

    func dismissPickerView(){
        let toolBar = UIToolbar()
        toolBar.sizeToFit()

        let doneButton = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(self.dismissKeyboard))
        toolBar.setItems([doneButton], animated: false)
        toolBar.isUserInteractionEnabled = true
        if cornerText.isSelected{
            cornerText.inputAccessoryView = toolBar
        }
        else {
            brandText.inputAccessoryView = toolBar
        }
    }

    @objc func dismissKeyboard(){
        view.endEditing(true)
        //   Put anything that must pop up based on the corner here

我希望两个pickerview都能工作，但现在两个pickerview都不能显示。

Answer 1

您的选择器 View 数据源/委托(delegate)代码看起来不错。问题似乎在于如何为每个文本字段创建和设置输入 View 和输入附件 View 。

您只需要一个选择器 View 和一个选项卡栏。将每个值分配给两个文本字段。

删除您的 dismissPickerView 方法并更新您的 createPickerView 方法，如下所示:

func createPickerView() {
    let pickerView = UIPickerView()
    pickerView.delegate = self
    pickerView.dataSource = self

    cornerText.inputView = pickerView
    brandText.inputView = pickerView

    let toolBar = UIToolbar()
    let doneButton = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(self.dismissKeyboard))
    toolBar.setItems([doneButton], animated: false)

    cornerText.inputAccessoryView = toolBar
    brandText.inputAccessoryView = toolBar
}

由于两个文本字段共享相同的选取器 View ，因此每次文本字段开始编辑时，您都需要重新加载选取器 View 。实现 textFieldDidBeginEditing 委托(delegate)方法，访问选取器 View 并重新加载它。