Swift：在带有完成按钮的文本框中弹出 DatePicker

Question

我正在创建一个应用程序，上面有一个 UITextField，当点击/单击它时，将显示一个从底部弹出的日期选择器。所述弹出面板有一个完成按钮，该按钮将在单击/点击时将选择的任何日期（默认为今天）应用到文本字段，最好是 YYYY-MM-DD 格式。

我一直在网上搜索，到目前为止，我已经看到了带有 IBAction 文本字段的示例，以及关于完成按钮如何工作的各种方式（并且大多数没有完成按钮），但我想知道如果我可以在下面的下拉菜单中回收或基于我的代码：

let wellheadPressTest : [String] = ["PSIG", "MPAG"]
var wellboreStatusPickerView = UIPickerView()

override func viewDidLoad() {
    let wellboreStatusToolBar = UIToolbar()
    let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.FlexibleSpace, target: nil, action: nil)
    let doneButtonWellbore = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.Plain, target: self, action: "donePickerWellbore")

    wellboreStatusToolBar.barStyle = UIBarStyle.Default
    wellboreStatusToolBar.translucent = true
    wellboreStatusToolBar.tintColor = UIColor(red: 76/255, green: 217/255, blue: 100/255, alpha: 1)
    wellboreStatusToolBar.sizeToFit()
    wellboreStatusToolBar.setItems([spaceButton,spaceButton,doneButtonWellbore], animated: false)
    wellboreStatusToolBar.userInteractionEnabled = true

    wellboreStatusPickerView.delegate = self
    self.samplingWaterFormOneView.textfieldWellbore.inputView = wellboreStatusPickerView
    self.samplingWaterFormOneView.textfieldWellbore.inputAccessoryView = wellboreStatusToolBar
}


// Various Required PickerView functions

func donePickerWellbore(){
    let row = wellboreStatusPickerView.selectedRowInComponent(0);
    pickerView(wellboreStatusPickerView, didSelectRow: row, inComponent:0)
    self.samplingWaterFormOneView.textfieldWellbore.resignFirstResponder()
}

这是我尝试过的：

var dateSampledPickerView = UIDatePicker()

override func viewDidLoad() {
    let dateSampledPickerToolBar = UIToolbar()
    let doneButtonDate = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.Plain, target: self, action: "donePickerDate")
    dateSampledPickerToolBar.barStyle = UIBarStyle.Default
    dateSampledPickerToolBar.translucent = true
    dateSampledPickerToolBar.tintColor = UIColor(red: 76/255, green: 217/255, blue: 100/255, alpha: 1)
    dateSampledPickerToolBar.sizeToFit()
    dateSampledPickerToolBar.setItems([spaceButton,spaceButton,doneButtonDate], animated: false)
    dateSampledPickerToolBar.userInteractionEnabled = true

    dateSampledPickerView.datePickerMode = UIDatePickerMode.Date
    dateSampledPickerView.addTarget(self, action: Selector("datePickerValueChanged"), forControlEvents: UIControlEvents.ValueChanged)

    self.samplingWaterFormOneView.textfieldDateSampled.inputView = dateSampledPickerView
    self.samplingWaterFormOneView.textfieldDateSampled.inputAccessoryView = dateSampledPickerToolBar
    self.samplingWaterFormOneView.textfieldDateSampled.delegate = self
}

func datePickerValueChanged(sender:UIDatePicker) {
    let dateFormatter = NSDateFormatter()
    dateFormatter.dateStyle = "YYYY-MM-DD"
    dateFormatter.timeStyle = NSDateFormatterStyle.NoStyle
    self.samplingWaterFormOneView.textfieldDateSampled.text = dateFormatter.stringFromDate(sender.date)
}

func donePickerDate(){
    self.samplingWaterFormOneView.textfieldDateSampled.resignFirstResponder()
}

当我在文本字段顶部时，上面的代码确实显示了一个带有日期选择器的弹出菜单，带有一个完成按钮，但文本字段没有获取日期。

编辑：还尝试修改datePickerValueChanged 使其没有发件人，并且还使用dateSampledPickerView 作为文本字段。没用。

在函数中加入 cmets 表明 datePickerValueChanged 函数没有被调用。

我做错了什么？

Answer 1

这里有一个带有工具栏的日期选择器示例：

var date: NSDate?
var timePicker: UIDatePicker?

@IBOutlet weak var dateLabel: UILabel!

func initDatePicker() {
        if self.timePicker == nil {
            self.timePicker = UIDatePicker()
            self.timePicker!.datePickerMode = UIDatePickerMode.Date
            self.timePicker!.addTarget(self, action: "updateDate", forControlEvents: UIControlEvents.ValueChanged)
            self.timePicker!.minimumDate = NSDate()
            self.timePicker!.backgroundColor = UIColor().backgroundColor()
            self.dateLabel.inputView = self.timePicker
            self.dateLabel.inputAccessoryView = self.createPickerToolBar()
        }
    }

func updateDate() {
        let picker: UIDatePicker = self.dateLabel.inputView as! UIDatePicker
        self.dateLabel.text = picker.date.stringFromDate(kDateFormatSlash)
        self.date = picker.date
        self.delegate?.didIntroduceText(self.actionTextView.text.characters.count != 0 && self.searchableTableView?.getText().characters.count != 0 && self.dateLabel.text!.characters.count != 0)
    }

    func createPickerToolBar() -> UIToolbar {
        let toolbar = UIToolbar()
        let doneButton = UIBarButtonItem(title: "DONE", style: UIBarButtonItemStyle.Done, target: self, action: "doneAction")
        doneButton.setTitleTextAttributes([NSFontAttributeName: UIFont(name: kOpenSansRegular, size: kHeaderFontSize)!, NSForegroundColorAttributeName: UIColor.whiteColor()], forState: UIControlState.Normal)
        doneButton.accessibilityLabel = "DoneToolbar"
        let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.FlexibleSpace, target: nil, action: nil)
        toolbar.translucent = false
        toolbar.sizeToFit()
        toolbar.setItems([spaceButton, doneButton], animated: false)
        toolbar.userInteractionEnabled = true
        return toolbar
    }

    func doneAction() {
        self.updateDate()
        self.dateLabel.resignFirstResponder()
        self.timePicker?.removeFromSuperview()
    }

Answer 2

我相信 datePickerValueChanged 函数没有被调用，因为您没有设置 dateSampledPickerView 的委托。

所以直接输入

dateSampledPickerView.delegate = self

*********编辑****************

好的，仔细观察后，我相信您错误地设置了动作调用。替换这一行

    dateSampledPickerView.addTarget(self, action: Selector("datePickerValueChanged"), forControlEvents: UIControlEvents.ValueChanged)

与

dateSampledPickerView.addTarget(self, action: "datePickerValueChanged", forControlEvents: UIControlEvents.ValueChanged)

移除 Selector()