ios - 单击另一个按钮 swift 2.2 更改声音按钮图像

Question

我正在创建一个 Tableview，里面是 Tableviewcell，单元格上有一个标签和声音按钮。对于每个标签，单击按钮时都会发出声音。当我第一次点击 btn1 时，声音播放并且按钮图像变为“暂停”，当我再次点击时，相同的按钮声音停止并且图像变为“播放”以这种方式完美地工作但是当我第一次点击时一个按钮上的时间假设 btn1 并且没有再次单击它(停止声音)我单击 btn2，btn1 的声音停止并且 btn1 和 btn2 的图像发生变化。我希望当我点击 btn 2,3 或 4 时，前一个声音应该停止，前一个按钮的图像(表示除当前按钮之外的所有按钮)应该变为“播放”并且当前单击的按钮应该变为“暂停”之前点击的声音应该停止，当前点击的声音应该播放。

import UIKit

class TableViewCell: UITableViewCell {

    @IBOutlet weak var titleLable: UILabel!
    @IBOutlet weak var sound: UIButton!
    override func awakeFromNib() {
        super.awakeFromNib()
    }

class ViewController: UIViewController , UITableViewDataSource , UITableViewDelegate , GADInterstitialDelegate {

    var countsNumberOfButtonClicks = 0
    var countsNumberOfInfoBtnClicks = 0
    var isFirstTime = false
    var player : AVAudioPlayer! = nil
    var titleAlert: String!

    @IBOutlet weak var myTableView: UITableView!
    var toggleState = 1


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

    {

    let myCell = self.myTableView.dequeueReusableCellWithIdentifier("myCell", forIndexPath: indexPath) as! TableViewCell

        myCell.titleLable.text = self.Duck[indexPath.row]

        myCell.sound.tag = indexPath.row
        myCell.sound.addTarget(self, action: #selector(self.playSound), forControlEvents: .TouchUpInside)
     return myCell
    }

   @IBAction func playSound(sender: UIButton) {

            if toggleState == 1 {
            let fullName: String = self.Duck[sender.tag]
            let fullNameArr = fullName.componentsSeparatedByString(" ")
            let path = NSBundle.mainBundle().pathForResource(fullNameArr[0], ofType:"wav", inDirectory: "sounds")
            let fileURL = NSURL(fileURLWithPath: path!)
            do {
                player = try AVAudioPlayer(contentsOfURL: fileURL)
                player.prepareToPlay()
            } catch {
                print("Problem in getting File")
              }   
            player.play()
            sender.setImage(UIImage(named: "pause.png"), forState: UIControlState.Normal)
            print("toggle state 1")
            toggleState = 2
        }
        else {
            player.pause()
            toggleState = 1
            sender.setImage(UIImage(named: "play.png"), forState: UIControlState.Normal)
            print("Toggle state else")
 }

Simulator result

Answer 1

在你的类中，声明一个变量，

var currentlyPlaying : UIButton?

无论你在哪里播放声音，将播放声音的按钮存储在这个变量中，每当这个变量将要改变时，重置以前的图像并存储新的图像。

@IBAction func playSound(sender: UIButton) {

        if currentlyPlaying != sender || toggleState == 1 {

        //Set image in previous
        currentlyPlaying?.setImage(UIImage(named: "play.png")

        if player != nil{
            player.pause()
        }

        let fullName: String = self.Duck[sender.tag]
        let fullNameArr = fullName.componentsSeparatedByString(" ")
        let path = NSBundle.mainBundle().pathForResource(fullNameArr[0], ofType:"wav", inDirectory: "sounds")
        let fileURL = NSURL(fileURLWithPath: path!)
        do {
            player = try AVAudioPlayer(contentsOfURL: fileURL)
            player.prepareToPlay()
        } catch {
            print("Problem in getting File")
          }   
        player.play()


        sender.setImage(UIImage(named: "pause.png"), forState: UIControlState.Normal)

        //Store new
        currentlyPlaying = sender

        print("toggle state 1")

        if sender != currentlyPlaying{
            toggleState = 2
        }

        myTableView.reloadData()

    }
    else {
        player.pause()
        toggleState = 1
        sender.setImage(UIImage(named: "play.png"), forState: UIControlState.Normal)
        print("Toggle state else")
}