Question

我正在开发项目，我必须根据datepicker值设置按钮标题。

我的设计如下

THIS

现在我的代码如下所示

这是我设置为tableviewCell

的按钮

  let btn_start_time = cell.viewWithTag(2) as! UIButton
  btn_start_time.addTarget(self, action: #selector(btnStartTimePressed), forControlEvents: .TouchUpInside)

点击

时，这是我的按钮操作方法

func btnStartTimePressed(sender: UIButton!)  {
        let buttonPosition = sender.convertPoint(CGPointZero, toView: self.tbl_availability)
        let indexPath = self.tbl_availability.indexPathForRowAtPoint(buttonPosition)
        UtilityHandler.addpopupZoomAnimationTopickerView(view_time_picker, view: self.view)
        time_picker.addTarget(self, action: Selector(datepickeractionmethod(time_picker)), forControlEvents: .ValueChanged)
        sender.setTitleColor(BUTTON_BLACK_COLOR_222222, forState: .Normal)
        sender.setTitle(strDate as String, forState: .Normal)   
}

这是我的datepicker Action方法

 func datepickeractionmethod(sender : UIDatePicker) {
        let dateFormatter = NSDateFormatter()
        dateFormatter.dateFormat = "hh:mm a"
        strDate = dateFormatter.stringFromDate(self.time_picker.date)
 }

我想在更改datepicker值时更改按钮标题。

我试过了 1）我将额外的参数作为按钮添加到datepicker动作方法并在那里设置标题但是当我点击按钮时它也改变了，而不是当我的DATEPICKER值改变时 2）我尝试设置按钮动作方法但是当我点击按钮时它起作用。

请帮帮我。

Answer 1

创建一个枚举并使其实例检查当前显示的是哪个选择器是startTime还是endTime，还创建两个String实例来保存选择器中的值。

enum TimeType {
    case StartTime
    case EndTime
}

var timeType: TimeType?
var startTime = "Start Time"
var endTime = "End Time"

现在在cellForRowAt indexPath中使用这两个字符串对象。

let btn_start_time = cell.viewWithTag(2) as! UIButton
btn_start_time.addTarget(self, action: #selector(btnStartTimePressed), forControlEvents: .TouchUpInside)
btn_start_time.setTitle(startTime, for: .normal)

let btn_start_time = cell.viewWithTag(3) as! UIButton
btn_start_time.addTarget(self, action: #selector(btnEndTimePressed), forControlEvents: .TouchUpInside)
btn_start_time.setTitle(endTime, for: .normal)

现在在按钮操作中设置枚举实例。

func btnStartTimePressed(sender: UIButton!)  {
   UtilityHandler.addpopupZoomAnimationTopickerView(view_time_picker, view: self.view)
    time_picker.addTarget(self, action:#selector(datepickeractionmethod(_:)), forControlEvents: .ValueChanged)

    //Set which picker is Shown
    timeType = .StartTime
}

func btnEndTimePressed(sender: UIButton!)  {
    let buttonPosition = sender.convertPoint(CGPointZero, toView: self.tbl_availability)
    let indexPath = self.tbl_availability.indexPathForRowAtPoint(buttonPosition)
    UtilityHandler.addpopupZoomAnimationTopickerView(view_time_picker, view: self.view)
    time_picker.addTarget(self, action: #selector(datepickeractionmethod(_:)), forControlEvents: .ValueChanged)

    //Set which picker is Shown
    timeType = .EndTime
}

现在在datePicker操作中使用此枚举

func datepickeractionmethod(sender : UIDatePicker) {
    let dateFormatter = NSDateFormatter()
    dateFormatter.dateFormat = "hh:mm a"
    let time = dateFormatter.stringFromDate(self.time_picker.date)
    if self.timeType = .StartTime {
        self.startTime = time
    }
    else {
        self. endTime = time
    }

    //Now simply reload tableView or you can even reload single row that contains these two buttons.
    self.tableView.reloadData() 
}

Answer 2

您需要为跟踪点击按钮声明全局按钮实例。

class ViewController: UIViewController{
    var clickedButton : UIButton

func btnStartTimePressed(sender: UIButton!)  {
        let buttonPosition = sender.convertPoint(CGPointZero, toView: self.tbl_availability)
        let indexPath = self.tbl_availability.indexPathForRowAtPoint(buttonPosition)
        UtilityHandler.addpopupZoomAnimationTopickerView(view_time_picker, view: self.view)
        time_picker.addTarget(self, action: Selector(datepickeractionmethod(time_picker)), forControlEvents: .ValueChanged)
        sender.setTitleColor(BUTTON_BLACK_COLOR_222222, forState: .Normal)
        clickedButton = sender
}

 func datepickeractionmethod(sender : UIDatePicker) {
        let dateFormatter = NSDateFormatter()
        dateFormatter.dateFormat = "hh:mm a"
        strDate = dateFormatter.stringFromDate(self.time_picker.date)
        clickedButton.setTitle(strDate as String, forState: .Normal)
 }

如何从Datepicker访问值以根据日期选择器值更改按钮标题？

2 个答案: