Question

我是一个初学者，因此如果这一切看起来很怪异，我深表歉意。

我有一个“时间和秒数字典”。这是一个带有pickerView的倒计时计时器应用程序，可让您选择倒计时开始时间，并在pickerView的didSelect中选择时间后，它将使用该时间量更新timerLabel。然后，当您点击播放时，它将从该时间量开始播放。

我正在尝试使用pickerView的didSelect中的协议来告诉我何时选择了时间，然后将时间与其以秒为单位的时间量值匹配，将Seconds转换为Hours：Minutes：Seconds并传递该信息发送给计时器，以便可以从该时间开始播放。但是，我无法完成委托。

我收到此错误：当我尝试在协议存根中调用键的值时，无法用类型为[[String]'的索引下标'[String：Int]'的值。我知道基本上我有一个数组，但无法从中获取键的值，但是我需要帮助弄清楚现在如何倒退……从数组返回键和值。我将所有Times都放入了pickerView数组中，但是我对如何获取在我给pickerview的Times数组中选择的键的值感到困惑。

到目前为止，这是我的代码，其中显示错误：

import UIKit

class TimerVC: UIViewController, TimerValueInSecondsDelegate {

struct Time {
    let name : String
    let amount : Double
}

let selectedTimes = [Time(name:"3 MIN", amount:180.0),
                     Time(name:"5 MIN", amount:300.0),
                     Time(name:"10 MIN", amount:600.0),
                     Time(name:"15 MIN", amount:900.0)]

var delegate: TimerValueInSecondsDelegate?
var counter = 1 //Starting value of seconds
var timer = Timer()
var isTimerRunning = false //Make sure only one timer is created at a time.
let customWidth: CGFloat = 120
let customHeight: CGFloat = 60

@IBOutlet weak var timePickerView: UIPickerView!
@IBOutlet weak var startTimerButton: UIButton!
@IBOutlet weak var timerNumbers: UILabel! //Countdown label
@IBOutlet weak var cancelTimer: UIButton! //Cancel the timer

override func viewDidLoad() {
    super.viewDidLoad()

    timePickerView.dataSource = self
    timePickerView.delegate = self

    cancelTimer.isHidden = true
    timerNumbers.isHidden = true

    startTimerButton.setImage(UIImage(named : "startTimerButton"), for: UIControlState.normal)
    startTimerButton.setImage(UIImage(named : "pauseTimerButton"), for: UIControlState.selected)
    startTimerButton.addTarget(self, action: #selector(startTimerAction), for: UIControlEvents.touchUpInside)
    self.view.addSubview(startTimerButton)
}

   func getSecondsValue(from time : Time) {
   let timeAmountValue = time.amount
}

@IBAction func startTimerAction(_ sender: UIButton) {

    if startTimerButton.isSelected == true {
        startTimerButton.isSelected = false
        timer.invalidate()
    }else {
        startTimerButton.isSelected = true
        runTimer()
    }

    cancelTimer.isHidden = false
    timerNumbers.isHidden = false
}

@IBAction func cancelTimerAction(_ sender: UIButton) {
    timer.invalidate()
    cancelTimer.isHidden = true
    timerNumbers.isHidden = true
    timerNumbers.text = String(counter)
    counter = 0
    startTimerButton.isSelected = false
    isTimerRunning = false
}

func runTimer() {
    timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(updateTimer), userInfo: nil, repeats: true)
    isTimerRunning = true
}

@objc func updateTimer() {
    counter -= 1
    //timerNumbers.text = timeString(time: TimeInterval(counter))
}

func timeString(time:TimeInterval) -> String {
    let hours = Int(time) / 3600
    let minutes = Int(time) / 60 % 60
    let seconds = Int(time) % 60
    return String(format:"%02i:%02i:%02i", hours, minutes, seconds)
}

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

extension TimerVC: UIPickerViewDelegate, UIPickerViewDataSource {
//!! pickerView code below !!//
func numberOfComponents(in pickerView: UIPickerView) -> Int {
    pickerView.subviews.forEach({
        $0.isHidden = $0.frame.height < 1.0
    })
    return 1
}

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return selectedTimes.count
}

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    let time = selectedTimes[row]
delegate?.getSecondsValue(from: time)
}

func pickerView(_ pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat {
    return customHeight
}

//custom pickerView label
func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
    let view = UIView(frame: CGRect(x: 0, y: 0, width: customWidth, height: customHeight))

    let pickerLabel = UILabel(frame: CGRect(x: 0, y: 0, width: customWidth, height: 50))
    pickerLabel.text = selectedTimes[row].name
    pickerLabel.textAlignment = .center
    view.addSubview(pickerLabel)
    return view
}
}

protocol TimerValueInSecondsDelegate {
func getSecondsValue(from time : Time)
}

Answer 1

您必须从具有row索引的数组中获取项目

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    let time = timePickerArray[row]
    delegate?.getSecondsValue(from: time)
}

并声明getSecondsValue

func getSecondsValue(from time : String) {
  let timeInSeconds = selectedTimes[time] 
}

编辑：

不是使用元组而是使用结构

struct Time {
   let name : String
   let amount : Double
}

...

let selectedTimes = [Time(name:"3 MIN", amount:180.0), 
                     Time(name:"5 MIN", amount:300.0), 
                     Time(name:"10 MIN", amount:600.0), 
                     Time(name:"15 MIN", amount:900.0)]

...

func getSecondsValue(from time : Time) {
   let timeAmountValue = time.amount
}

...

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    let time = selectedTimes[row]
    delegate?.getSecondsValue(from: time)
}

...

pickerLabel.text = selectedTimes[row].name

如何获得钥匙的价值并完成我的代表

1 个答案: