为什么我的 datePicker 没有显示？

Question

我有一个基本设置，当文本字段出现时 datePicker 就会出现。我在 datePicker 应该出现的 table 中有多个元素。我知道代码有效，因为我创建了一个完美运行的视图。我也是 swift 的新手。我相信它可能会出现在我的 table 视图后面。我怎么会 test/fix 那？这是我的 datePicker 的编码位置：

import UIKit

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UIPickerViewDelegate, UIPickerViewDataSource, UITextFieldDelegate {

@IBOutlet weak var tableView: UITableView!
@IBOutlet var coursePicker: UIPickerView!
@IBOutlet var courseTextfield: UITextField!
@IBOutlet var playerPicker: UIPickerView!
@IBOutlet var playerTextfield: UITextField!
@IBOutlet var timePicker: UIPickerView!
@IBOutlet var timeTextfield: UITextField!
@IBOutlet weak var dateTextfield: UITextField!

@IBAction func unwindToVC(segue: UIStoryboardSegue) {
    if(segue.sourceViewController.isKindOfClass(ConViewController)) {
        let viewCon:ConViewController = (segue.sourceViewController as? ConViewController)!
        lblOneData[tblIndex] = viewCon.pOneTextfield.text!
        lblTwoData[tblIndex] = viewCon.pTwoTextfield.text!
        lblThreeData[tblIndex] = viewCon.pThreeTextfield.text!
        lblFourData[tblIndex] = viewCon.pFourTextfield.text!
        tableView.reloadData()
    }
}

var tableData: [String] = ["8:00 am", "8:10 am", "8:20 am", "8:30 am", "8:40 am", "8:50 am", "9:00 am", "9:10 am", "9:20 am", "9:30 am", "9:40 am", "9:50 am", "10:00 am", "10:10 am", "10:20 am", "10:30 am", "10:40 am", "10:50 am", "11:00 am", "11:10 am", "11:20 am", "11:30 am", "11:40 am", "11:50 am", "12:00 pm", "12:10 pm", "12:20 pm", "12:30 pm", "12:40 pm", "12:50 pm", "1:00 pm", "1:10 pm", "1:20 pm", "1:30 pm", "1:40 pm", "1:50 pm", "2:00 pm", "2:10 pm", "2:20 pm", "2:30 pm", "2:40 pm", "2:50 pm", "3:00 pm", "3:10 pm", "3:20 pm", "3:30 pm", "3:40 pm", "3:50 pm", "4:00 pm", "4:10 pm", "4:20 pm", "4:30 pm", "4:40 pm", "4:50 pm", "5:00 pm"]
var courseData = ["Norman Course", "Riding Golf", "Dmob Course", "Brambleton", "Leesburg Clubhouse"]
var playersData = ["View All", "1 Available", "2 Available", "3 Available", "4 Available"]
var timeData = ["All Day", "Morning", "Afternoon"]
var lblOneData = ["Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available"]
var lblTwoData = ["Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available"]
var lblThreeData = ["Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available"]
var lblFourData = ["Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available","Available", "Available","Available","Available"]

let conSegueIdentifier = "ShowConSegue"
var timeToPass:String!
var availableIndexes = [Int]()
var tblIndex:Int!
var datePicker = UIDatePicker()

override func viewDidLoad() {
    super.viewDidLoad()

    let nib = UINib(nibName: "vwTblCell", bundle: nil)
    tableView.registerNib(nib, forCellReuseIdentifier: "cell")

    coursePicker.hidden = true
    self.courseTextfield.delegate = self

    playerPicker.hidden = true;
    self.playerTextfield.delegate = self

    timePicker.hidden = true;
    self.timeTextfield.delegate = self

    setupDatePicker()
}

func setupDatePicker() {
    dateTextfield.text = "Date"
    dateTextfield.textAlignment = .Center
    dateTextfield.tintColor = UIColor.clearColor()
    datePicker.datePickerMode = .Date

    let toolBar = UIToolbar()
    toolBar.barStyle = .Default
    toolBar.translucent = true
    toolBar.tintColor = UIColor(red: 92/255, green: 216/255, blue: 255/255, alpha: 1)
    toolBar.sizeToFit()

    let doneButton = UIBarButtonItem(title: "Done", style: .Plain, target: self, action: "doneClick")
    let spaceButton = UIBarButtonItem(barButtonSystemItem: .FlexibleSpace, target: nil, action: nil)
    let cancelButton = UIBarButtonItem(title: "Cancel", style: .Plain, target: self, action: "cancelClick")
    toolBar.setItems([cancelButton, spaceButton, doneButton], animated: false)
    toolBar.userInteractionEnabled = true

    // Adds the toolbar to the view
    dateTextfield.inputView = datePicker
    dateTextfield.inputAccessoryView = toolBar
}
func doneClick() {
    let dateFormatter = NSDateFormatter()
    dateFormatter.dateStyle = .ShortStyle
    dateTextfield.text = dateFormatter.stringFromDate(datePicker.date)
    dateTextfield.resignFirstResponder()
}
func cancelClick() {
    dateTextfield.resignFirstResponder()
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

//tableview

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    var numRows = tableData.count
    if(timeTextfield.text == timeData[1]) {
        numRows = 25
    }
    else if(timeTextfield.text == timeData[2]) {
        numRows = 30
    }
    return numRows
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    let cell:TblCell = self.tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! TblCell
    var lblOneBool = true
    var lblTwoBool = true
    var lblThreeBool = true
    var lblFourBool = true

    if(timeTextfield.text == timeData[2]) {
        cell.hidden = false
        cell.lblTime.text = tableData[indexPath.row + 25]
        cell.lblOne.text = lblOneData[indexPath.row + 25]
        cell.lblTwo.text = lblTwoData[indexPath.row + 25]
        cell.lblThree.text = lblThreeData[indexPath.row + 25]
        cell.lblFour.text = lblFourData[indexPath.row + 25]

                }
    else {
        cell.lblTime.text = tableData[indexPath.row]
        cell.lblOne.text = lblOneData[indexPath.row]
        cell.lblTwo.text = lblTwoData[indexPath.row]
        cell.lblThree.text = lblThreeData[indexPath.row]
        cell.lblFour.text = lblFourData[indexPath.row]
    }

    if(cell.lblOne.text != "Available") {
        lblOneBool = false
    }
    if(cell.lblTwo.text != "Available") {
        lblTwoBool = false
    }
    if(cell.lblThree.text != "Available") {
        lblThreeBool = false
    }
    if(cell.lblFour.text != "Available") {
        lblFourBool = false
    }

    if(playerTextfield.text == playersData[1]) {
        if(lblOneBool || lblTwoBool || lblThreeBool || lblFourBool) {
            cell.hidden = false
        }
        else {
            cell.hidden = true
        }
    }
    else if(playerTextfield.text == playersData[2]) {
        if((lblOneBool && lblTwoBool) || (lblOneBool && lblThreeBool) || (lblOneBool && lblFourBool) || (lblTwoBool && lblThreeBool) || (lblTwoBool && lblFourBool) || (lblThreeBool && lblFourBool)) {
            cell.hidden = false
        }
        else {
            cell.hidden = true
        }
    }
    else if(playerTextfield.text == playersData[3]) {
        if((lblOneBool && lblTwoBool && lblThreeBool) || (lblOneBool && lblTwoBool && lblFourBool) || (lblOneBool && lblThreeBool && lblFourBool) || (lblTwoBool && lblThreeBool && lblFourBool)) {
            cell.hidden = false
        }
        else {
            cell.hidden = true
        }
    }
    else if(playerTextfield.text == playersData[4]) {
        if(lblOneBool && lblTwoBool && lblThreeBool && lblFourBool) {
            cell.hidden = false
        }
        else {
            cell.hidden = true
        }
    }


    return cell
}

func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
    return 120
}

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

    let row = indexPath.row

    performSegueWithIdentifier(conSegueIdentifier, sender: indexPath)
    print(tableData[row])
    if(timeTextfield.text == timeData[2]) {
        tblIndex = row + 25
    }
    else {
        tblIndex = row
    }
}

//end of tableview

//pickerViews

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

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    if(pickerView == coursePicker) {
        return courseData.count
    }
    else if(pickerView == playerPicker) {
        return playersData.count
    }
    else if(pickerView == timePicker) {
        return timeData.count
    }
    return 0
}

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    if(pickerView == coursePicker) {
        return courseData[row]
    }
    else if(pickerView == playerPicker) {
        return playersData[row]
    }
    else if(pickerView == timePicker) {
        return timeData[row]
    }
    return courseData[row]
}

func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    if(pickerView == coursePicker) {
        courseTextfield.text = courseData[row]
        coursePicker.hidden = true
    }
    else if(pickerView == playerPicker) {
        playerTextfield.text = playersData[row]
        playerPicker.hidden = true
        tableView.reloadData()
    }
    else if(pickerView == timePicker) {
        timeTextfield.text = timeData[row]
        timePicker.hidden = true
        tableView.reloadData()
    }
}

func textFieldShouldBeginEditing(textField: UITextField) -> Bool {
    if(textField == courseTextfield) {
        coursePicker.hidden = false
    }
    if(textField == playerTextfield) {
        playerPicker.hidden = false
    }
    else if(textField == timeTextfield) {
        timePicker.hidden = false
    }
    return false
}

//end of pickerViews

//segue
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == conSegueIdentifier {
        let cvc = segue.destinationViewController as! ConViewController;
        let indexPath: NSIndexPath = self.tableView.indexPathForSelectedRow!
        let valueToPass:String

        if(timeTextfield.text == timeData[2]){
            tblIndex = indexPath.row + 25
            valueToPass = tableData[indexPath.row + 25]
        }
        else {
            tblIndex = indexPath.row
            valueToPass = tableData[indexPath.row]
        }
        cvc.conName = courseTextfield.text
        cvc.conDateName = dateTextfield.text
        cvc.conTimeName = valueToPass
        cvc.indexOfTbl = tblIndex
    }
}

}

Answer 1

我只是 copy/pasted 你在空白项目中编写的相同代码 works fine。所以我想主要问题不在我们的视野范围内，也许当你使用 UITableView. 你能告诉我们这个 View Controller 的其余代码，尤其是当你出队时的那部分 table 查看单元格并初始化 dateTextfield?

P.S。我还强烈建议您不要每次需要时都创建 NSDateFormatter 的新实例，因为它不是很省时。最流行的（也是 Apple 开发人员推荐的）做法是使用单例和惰性初始化器来缓存 NSDateFormatters。 Whosebug 有一个。

为什么我的 datePicker 没有显示？

Why isn't my datePicker showing?

uidatepicker

ios

swift