命令中心Scrubber锁定屏幕swift

Question

我正在尝试将洗涤器添加到命令中心锁定屏幕，我收到了这个错误无法赋值：函数调用返回不可变值我不知道这意味着什么。如有任何帮助，我们将不胜感激。

这就是我试图改变立场的方式

commandCenter.changePlaybackPositionCommand.addTarget(handler: {
(event) in
let event = event as! MPChangePlaybackPositionCommandEvent
self.player.currentTime() = event.positionTime  // ERROR
return MPRemoteCommandHandlerStatus.success
})

Answer 1

我认为您的播放器属性是AVPlayer(？？(，如果是这样，您希望使用seek函数来设置currentTime，而不是设置函数的返回值。。。

self.player.seek(to: CMTimeMakeWithSeconds(event.positionTime, 1000000))

Answer 2

首先，您必须设置nowPlaying元数据，每当您更改任何内容时都会调用它。

//MARK: setupNowPlaying----------------------------------
func setupNowPlaying() {
// Define Now Playing Info
var nowPlayingInfo = [String : Any]()
nowPlayingInfo[MPMediaItemPropertyTitle] = self.nowPlayingString
let image = UIImage(named: "Somni-lockLogo")! // this is the image you want to see on the lock screen
let artwork = MPMediaItemArtwork.init(boundsSize: image.size,
requestHandler: { (size) -> UIImage in
return image
})
nowPlayingInfo[MPNowPlayingInfoPropertyElapsedPlaybackTime] = self.player.currentTime
nowPlayingInfo[MPMediaItemPropertyPlaybackDuration] = self.player.duration
nowPlayingInfo[MPNowPlayingInfoPropertyPlaybackRate] = player.rate
//MARK: now playing
nowPlayingInfo[MPMediaItemPropertyArtwork] = artwork
nowPlayingInfo[MPMediaItemPropertyArtist ] = self.nowPlayingTitle
// other metadata exists, check the documentation
//  nowPlayingInfo[MPMediaItemPropertyArtist] = "David Bowie"
//  nowPlayingInfo[MPMediaItemPropertyComposer] = "Bill Gates"

// Set the metadata
MPNowPlayingInfoCenter.default().nowPlayingInfo = nowPlayingInfo
}

然后，您需要设置远程传输控制，以启用您需要的功能，如播放暂停跳过等这是我的功能的开始，它启用了一些东西并包含到代码中，以使洗涤器工作在中

func setupRemoteTransportControls() {
// Get the shared MPRemoteCommandCenter
let commandCenter = MPRemoteCommandCenter.shared()
commandCenter.playCommand.isEnabled = true
commandCenter.pauseCommand.isEnabled = true
let skipBackwardIntervalCommand: MPSkipIntervalCommand? = commandCenter.skipBackwardCommand
let skipForwardIntervalCommand: MPSkipIntervalCommand? = commandCenter.skipForwardCommand
let seekForwardCommand: MPRemoteCommand? = commandCenter.seekForwardCommand
let seekBackwardCommand: MPRemoteCommand? = commandCenter.seekBackwardCommand
seekForwardCommand?.isEnabled = true
seekBackwardCommand?.isEnabled = true

skipBackwardIntervalCommand!.isEnabled = true
skipForwardIntervalCommand!.preferredIntervals = [60]
skipBackwardIntervalCommand!.preferredIntervals = [60]
commandCenter.changePlaybackPositionCommand.isEnabled = true

commandCenter.changePlaybackPositionCommand.addTarget
{ (event: MPRemoteCommandEvent) -> MPRemoteCommandHandlerStatus in
let event = event as! MPChangePlaybackPositionCommandEvent
print("change playback",event.positionTime)
self.player.currentTime = event.positionTime
self.setupNowPlaying()
return .success
}

//etc等等。您想要使用的任何东西都需要一个处理程序，并且您需要在处理程序中将事件类型设置为正确的类型。