Stop Others Sound if any one playing from other cells when UIButton is press from uitableviewcell

Question

When I pressed on UIButton Music starts. And when I again press on button music will stop. During playing music if I press on another cell button both music plays. I didn't understand how I can stop music that is playing from other cells or in other words only one music instance playing at once. Also a button image animation automatically set to its default state like sender.selected = false

Please can anyone tell me how i can do this?

Thanks

UIButton connected with CollectionViewCell Class

Default image State And when i pressed on button on different cells each cell play music and and change its image state to play

class RadioCollectionViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {

    let reuseIdentifier = "cell" 

    var objects = [
        ["url" : "https://s3.amazonaws.com/kargopolov/BlueCafe.mp3", "image": "1.jpg"],
        ["url" : "https://s3.amazonaws.com/kargopolov/BlueCafe.mp3", "image": "2.jpg"],
        ["url" : "http://2016.downloadming1.com/bollywood%20mp3/Sanam%20Teri%20Kasam%20(2016)/02%20-%20Kheech%20Meri%20Photo%20-%20DownloadMing.SE.mp3", "image": "3.jpg"],
        ["url" : "http://2016.downloadming1.com/bollywood%20mp3/Sanam%20Teri%20Kasam%20(2016)/03%20-%20Bewajah%20-%20DownloadMing.SE.mp3", "image": "4.jpg"],
        ["url" : "http://2016.downloadming1.com/bollywood%20mp3/Sanam%20Teri%20Kasam%20(2016)/04%20-%20Tera%20Chehra%20-%20DownloadMing.SE.mp3", "image": "5.jpg"],
        ["url" : "http://2016.downloadming1.com/bollywood%20mp3/Sanam%20Teri%20Kasam%20(2016)/02%20-%20Kheech%20Meri%20Photo%20-%20DownloadMing.SE.mp3", "image": "6.jpg"],
        ["url" : "http://media.downloadming.se/TEMP/Loveshhuda%20(2015)/01%20-%20Mar%20Jaayen%20-%20DownloadMing.SE.mp3", "image": "5.jpg"],
        ["url" : "http://2016.downloadming1.com/bollywood%20mp3/Sanam%20Teri%20Kasam%20(2016)/01%20-%20Sanam%20Teri%20Kasam%20-%20DownloadMing.SE.mp3", "image": "7.jpg"],
        ["url" : "http://2016.downloadming1.com/bollywood%20mp3/Sanam%20Teri%20Kasam%20(2016)/02%20-%20Kheech%20Meri%20Photo%20-%20DownloadMing.SE.mp3", "image": "1.jpg"]]

    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return self.objects.count
    }

    func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! RadioCollectionViewCell

        let object = objects[indexPath.row]
        cell.url = object["url"]! 
        cell.img.image = UIImage(named: object["image"]!)
        return cell
    }
}

In my UICollectionViewCell Class

class RadioCollectionViewCell: UICollectionViewCell {

    @IBOutlet weak var img: UIImageView!

    var url : String!

    var playerItem:AVPlayerItem?
    var player:AVPlayer?

    @IBAction func audioControlButtonAction(sender: UIButton) {

        let nurl = NSURL(string: "\(url)")!
        playerItem = AVPlayerItem(URL: nurl)
        player=AVPlayer(playerItem: playerItem!)

        if sender.selected == false {

            player!.play()
            sender.selected = true

        }else

        {
            player?.pause()
            sender.selected = false
        }   
    }
}

Answer 1

Don't check every time audio is playing or not. Simply call player.pause() then start audio playing with player.play()