我有2个（或更多）可重复使用的collectionView单元格，每个单元格必须播放不同的音频。我的问题是当audio1完成时，audio2文件在audio2的同一个单元格中启动。如果我在每个单元格上手动播放都没有问题，但如果我想一个接一个地自动播放所有音频，则所有音频都在同一个单元格中播放。如果尚未创建单元格，如何在下一个单元格中启动下一个音频？ 我在这里如何附加到数组：
func appendToArray() {
for (_, page) in self.resources.enumerate() {
for (index,resource) in page.enumerate() {
print("Passa di qui") // Qui passa
if resource.fileType() == .Audio {
S3Client.sharedInstance.downloadResource(resourceKey: resource.value, completion: { (success, file) in
// let files = String(file)
self.audioURLs.append(file)
/**
if self.audioURLs.count == self.resources.count {
// print("audioURLs \(self.audioURLs[index])")
MediaAudioPlayer.sharedInstance.queueTrack(self.audioURLs)
}
*/
})
}
}
}
}
这是cellForItemAtIndexPath：
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
case .Audio:
let cell = collectionView.dequeueReusableCellWithReuseIdentifier(MediaAudioCell.kCellIdentifier, forIndexPath: indexPath) as! MediaAudioCell
cell.activityIndicator.startAnimating()
cell.activityIndicator.hidden = false
S3Client.sharedInstance.downloadResource(resourceKey: resource.value, completion: { (success, file) in
if success == true && file != nil {
cell.activityIndicator.stopAnimating()
cell.activityIndicator.hidden = true
cell.audioURL = file!
// Make slider indipendent from cell to another
cell.sliderAudio.tag = indexPath.row
cell.sliderAudio.addTarget(self, action: "sliderChange:", forControlEvents: .ValueChanged)
// print("ArrayURL: \(file)")
// print("CiaoCell : \(self.audioURLs.count)")
// print("Ciaoself.resources.countCell : \(self.resources.count)")
/**
if self.audioURLs.count == self.resources.count {
// print("audioURLs \(self.audioURLs[index])")
let item = self.audioURLs[indexPath.row] print("item: \(item)")
}
if self.audioURLs.count == self.resources.count {
// print("audioURLs \(self.audioURLs[index])")
// MediaAudioPlayer.sharedInstance.queueTrack(self.audioURLs)
}
*/
// Display total audio leinght
let asset = AVURLAsset(URL: file!, options: nil)
let audios = asset.tracksWithMediaType(AVMediaTypeAudio)
if let audios: AVAssetTrack = audios[0] {
let audioDuration:CMTime = audios.timeRange.duration
let seconds:Float64 = CMTimeGetSeconds(audioDuration)
cell.labelAudio.text = cell.stringFromTimeInterval(NSTimeInterval(seconds)) as String
}
}
})
return cell
}
这是小组课程的一部分：
override func awakeFromNib() {
super.awakeFromNib()
// Partenza automatica, dopo 2secondi, se Accessibilità su ON
let delayTime = dispatch_time(DISPATCH_TIME_NOW, Int64(2 * Double(NSEC_PER_SEC)))
dispatch_after(delayTime, dispatch_get_main_queue()) {
if self.defaults.boolForKey("AutomaticStart") == true && self.defaults.boolForKey("goBackPressed") == false {
if let audioURL = self.audioURL {
// Set AVAudioSession for recording and playing at the same time
let session = AVAudioSession.sharedInstance()
do {
try session.setCategory(AVAudioSessionCategoryPlayback)
try session.setActive(true)
} catch _ {}
// If audio is playing, do not pass to next if cell is created, but continue to playing.
if MediaAudioPlayer.sharedInstance.player?.playing == true { // Se metto a 'false', ed elimino 'else', non parte in automatico.
} else {
MediaVideoPlayer.sharedInstance.stop()
MediaAudioPlayer.sharedInstance.playPauseAudio(audioURL: audioURL, delegate: self)
}
}
}
}
}
这是玩家类：
class MediaAudioPlayer: NSObject, AVAudioPlayerDelegate {
static let sharedInstance = MediaAudioPlayer()
private var delegate: MediaAudioPlayerDelegate?
var player: AVAudioPlayer?
private var lastURL: NSURL?
private var timer: NSTimer?
internal var sliderTouched: Bool = false
var tracks = Array<NSURL?>()
var currentTrackIndex = 0
override init() {
super.init()
}
// MARK: Setup
func playPauseAudio(audioURL url: NSURL, delegate: MediaAudioPlayerDelegate) {
self.delegate?.playing = true // Set default play button on last delegate
self.delegate = delegate // Save delegate
self.sliderTouched = false
// Setup as new only when this audio has not been already set up
if (self.lastURL == nil) || (url != self.lastURL) {
self.lastURL = url
self.setupAudioSession(category: AVAudioSessionCategoryPlayback)
do { // Setup Player
self.player = try AVAudioPlayer(contentsOfURL: url)
} catch _ {}
self.player?.delegate = self
self.player?.prepareToPlay()
timer = NSTimer.scheduledTimerWithTimeInterval(0.4, target: self, selector: #selector(MediaAudioPlayer.update), userInfo: nil, repeats: true)
}
// Play - Pause
if self.player?.playing == true {
self.player?.pause()
self.delegate?.playing = true
} else {
self.player?.play()
self.delegate?.playing = false
}
}
// Transform second to minute
func stringFromTimeInterval(interval: NSTimeInterval) -> NSString {
let ti = NSInteger(interval)
let seconds = ti % 60
let minutes = (ti / 60) % 60
return NSString(format: "%0.2d:%0.2d", minutes, seconds)
}
// MARK: Audio Session
private func setupAudioSession(category category: String) {
let session = AVAudioSession.sharedInstance()
do {
try session.setCategory(category)
try session.setActive(true)
} catch _ {}
}
// MARK: Stop
func stop() {
self.player?.stop()
self.player = nil // Deinit player
self.delegate?.playing = true
self.delegate = nil // Deinit delegate
self.timer?.invalidate(); self.timer = nil
self.lastURL = nil
}
// MARK: Playing
internal func playing() -> Bool {
if player != nil {
return player?.rate == 1.0 ? true : false
}
return false
}
// MARK: Seek
func seekToPosition(position position: Float) {
if let duration = self.player?.duration {
player?.currentTime = Double(position) * duration
self.delegate?.currentTimeAudio = stringFromTimeInterval((player?.currentTime)!) as String
}
}
func update() {
if sliderTouched == false {
if let currentTime = self.player?.currentTime, duration = player?.duration {
let time = Float(currentTime) / Float(duration)
self.delegate?.sliderPosition = time
self.delegate?.currentTimeAudio = stringFromTimeInterval((player?.currentTime)!) as String
}
}
}
// MARK: Delegate
var counter = 0
func audioPlayerDidFinishPlaying(player: AVAudioPlayer, successfully flag: Bool) {
print("Called")
self.lastURL = nil
self.delegate?.playing = true
/**
if flag == true {
nextSong(true)
}*/
/**
if ((counter + 1) == tracks.count) {
counter = 0
self.delegate?.playing = false
nextSong(false)
} else {
self.delegate?.playing = true
nextSong(true)
}
*/
}
}
谢谢！