当 AVAudioPlayer 完成播放时切换 tableview 单元格图像
Toggle tableview cell image when AVAudioPlayer finishes playing
我有一个表格视图,每个单元格都有一个播放按钮。播放按钮是一个 UIButton
,可在播放和暂停图像之间切换。当按下 play/pause 按钮时,AVAudioPlayer
plays/pauses 与单元格关联的音频文件。截至目前,我的图像可以完美切换并与音频播放器同步。但是,当音频播放完毕后,我希望图像切换回其默认状态 - 播放按钮图像。
//View controller containing tableview
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = self.audioTable.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! AudioCell
let track = self.sectionTracks[indexPath.row]
cell.playButton.addTarget(self, action: #selector(HomeController.playPausePressed(_:)), forControlEvents: UIControlEvents.TouchUpInside)
var playButtonImage = UIImage(named: "TableViewCellPlayButton84.jpg")
var pauseButtonImage = UIImage(named: "TableViewCellPauseButton84.jpg")
playButtonImage = playButtonImage?.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
pauseButtonImage = pauseButtonImage?.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
cell.playButton.setImage(playButtonImage, forState: UIControlState.Normal)
cell.playButton.setImage(pauseButtonImage, forState: UIControlState.Selected)
cell.playButton.selected = false
return cell
}
func playPausePressed(sender:UIButton) {
let pointInTable: CGPoint = sender.convertPoint(sender.bounds.origin, toView: self.audioTable)
let cellIndexPath = self.audioTable.indexPathForRowAtPoint(pointInTable)
let track = self.sectionTracks[cellIndexPath!.row]
//Handle AVAudioPlayer play/pause functionality
}
//Custom tableview cell file
@IBAction func playPausePressed(sender: UIButton!) {
if (sender.selected)
{
sender.selected = false
}
else{
sender.selected = true
}
}
您可以订阅成为AVAudioPlayer的代理,然后检查音频何时播放完毕。您可以一次播放多个文件还是多个文件?如果您可以播放多个,则必须跟踪所有正在播放的音频,然后根据触发代理的时间以及播放器与哪一行相关联来切换行上的按钮。如果您只能播放一个,那么当用户开始播放音频时,只需保存该行,当音频结束时切换该行的按钮。
private var xoAssociationKey: UInt8 = 0
extension AVAudioPlayer {
var name: String! {
get {
return objc_getAssociatedObject(self, &xoAssociationKey) as? String
}
set(newValue) {
objc_setAssociatedObject(self, &xoAssociationKey, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN)
}
}
}
如上所示进行扩展以将名称存储到 AVAudioPlayer 实例可能会有所帮助。然后,您可以在 mutable 字典中跟踪正在播放的音频的名称和单元格的索引路径。当您收到对委托函数 optional func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool)
的回调时,您可以在字典中查找 player.name
,它将返回该按钮单元格的索引路径。从 table 视图中获取单元格,然后切换按钮的选定状态。
编辑
对于一次播放的单个单元格,您可以为您添加一个变量 class 作为 var playingAudioIndexPath:NSIndexPath?
当音频开始播放时,将其设置为所单击按钮的单元格索引路径。
然后在播放完成事件中,只需抓住单元格并切换按钮
func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer,
successfully flag: Bool) {
guard let indexPath = self.playingAudioIndexPath,
cell = self.table.cellForRowAtIndexPath(indexPath) as? AudioCell else {
return;
}
cell.playButton.selected = false
self.playingAudioIndexPath = nil
}
DMCApps
我有一个表格视图,每个单元格都有一个播放按钮。播放按钮是一个 UIButton
,可在播放和暂停图像之间切换。当按下 play/pause 按钮时,AVAudioPlayer
plays/pauses 与单元格关联的音频文件。截至目前,我的图像可以完美切换并与音频播放器同步。但是,当音频播放完毕后,我希望图像切换回其默认状态 - 播放按钮图像。
//View controller containing tableview
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = self.audioTable.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! AudioCell
let track = self.sectionTracks[indexPath.row]
cell.playButton.addTarget(self, action: #selector(HomeController.playPausePressed(_:)), forControlEvents: UIControlEvents.TouchUpInside)
var playButtonImage = UIImage(named: "TableViewCellPlayButton84.jpg")
var pauseButtonImage = UIImage(named: "TableViewCellPauseButton84.jpg")
playButtonImage = playButtonImage?.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
pauseButtonImage = pauseButtonImage?.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
cell.playButton.setImage(playButtonImage, forState: UIControlState.Normal)
cell.playButton.setImage(pauseButtonImage, forState: UIControlState.Selected)
cell.playButton.selected = false
return cell
}
func playPausePressed(sender:UIButton) {
let pointInTable: CGPoint = sender.convertPoint(sender.bounds.origin, toView: self.audioTable)
let cellIndexPath = self.audioTable.indexPathForRowAtPoint(pointInTable)
let track = self.sectionTracks[cellIndexPath!.row]
//Handle AVAudioPlayer play/pause functionality
}
//Custom tableview cell file
@IBAction func playPausePressed(sender: UIButton!) {
if (sender.selected)
{
sender.selected = false
}
else{
sender.selected = true
}
}
您可以订阅成为AVAudioPlayer的代理,然后检查音频何时播放完毕。您可以一次播放多个文件还是多个文件?如果您可以播放多个,则必须跟踪所有正在播放的音频,然后根据触发代理的时间以及播放器与哪一行相关联来切换行上的按钮。如果您只能播放一个,那么当用户开始播放音频时,只需保存该行,当音频结束时切换该行的按钮。
private var xoAssociationKey: UInt8 = 0
extension AVAudioPlayer {
var name: String! {
get {
return objc_getAssociatedObject(self, &xoAssociationKey) as? String
}
set(newValue) {
objc_setAssociatedObject(self, &xoAssociationKey, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN)
}
}
}
如上所示进行扩展以将名称存储到 AVAudioPlayer 实例可能会有所帮助。然后,您可以在 mutable 字典中跟踪正在播放的音频的名称和单元格的索引路径。当您收到对委托函数 optional func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool)
的回调时,您可以在字典中查找 player.name
,它将返回该按钮单元格的索引路径。从 table 视图中获取单元格,然后切换按钮的选定状态。
编辑
对于一次播放的单个单元格,您可以为您添加一个变量 class 作为 var playingAudioIndexPath:NSIndexPath?
当音频开始播放时,将其设置为所单击按钮的单元格索引路径。
然后在播放完成事件中,只需抓住单元格并切换按钮
func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer,
successfully flag: Bool) {
guard let indexPath = self.playingAudioIndexPath,
cell = self.table.cellForRowAtIndexPath(indexPath) as? AudioCell else {
return;
}
cell.playButton.selected = false
self.playingAudioIndexPath = nil
}
DMCApps