UIPickerView上的完成工具栏

Question

因此，当我单击时，页面上会有一个按钮，我正在打开选择器视图。我已经用几个月来填充选择器视图。我添加了一个工具栏，但是每当尝试选择它时，都将选择器视图滚动到顶部。

    monthPicker = UIPickerView(frame: CGRect(x: 0, y: self.view.frame.size.height- monthPicker.frame.size.height, width: self.view.frame.size.width, height: monthPicker.frame.size.height))
    monthPicker.delegate = self
    monthPicker.dataSource = self
    monthpickerData = ["January","February","March","April","May","June","July","August","September","October","November","December"]
    monthPicker.backgroundColor = UIColor.white
    //
    let btnDone = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(self.monthdoneButtonAction))
    let barAccessory = UIToolbar(frame: CGRect(x: 0, y: 0, width: monthPicker.frame.size.width, height: 44))
    barAccessory.barStyle = .default
    barAccessory.isTranslucent = false
    barAccessory.items = [flexiblespace,btnDone]
    monthPicker.addSubview(barAccessory)

Answer 1

似乎UIPickerView不允许其子级接收触摸事件。如果将其与UITextField一起显示，则可以使用它的inputView和inputAccessoryView来实现相同的效果。或者，您可以创建一个顶级容器UIView来保存工具栏视图和选择器视图，如下所示：

    let picker = UIView(frame: CGRect(x: 0, y: view.frame.height - 260, width: view.frame.width, height: 260))

    // Toolbar
    let btnDone = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(self.monthdoneButtonAction))
    let spaceButton = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
    let cancelButton = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(self.cancelClick))

    let barAccessory = UIToolbar(frame: CGRect(x: 0, y: 0, width: picker.frame.width, height: 44))
    barAccessory.barStyle = .default
    barAccessory.isTranslucent = false
    barAccessory.items = [cancelButton, spaceButton, btnDone]
    picker.addSubview(barAccessory)

    // Month UIPIckerView
    monthPicker = UIPickerView(frame: CGRect(x: 0, y: barAccessory.frame.height, width: view.frame.width, height: picker.frame.height-barAccessory.frame.height))
    monthPicker.delegate = self
    monthPicker.dataSource = self
    monthpickerData = ["January","February","March","April","May","June","July","August","September","October","November","December"]
    monthPicker.backgroundColor = UIColor.white
    picker.addSubview(monthPicker)