Question

我有两种方法可以在CC / Lock屏幕上显示媒体信息

func updateGeneralMetadata() {
        guard player.url != nil, let _ = player.url else {
            nowPlayingInfoCenter.nowPlayingInfo = nil
            return
        }
        let item = currentItem
        var rating = ""
        for _ in 0 ..< item!.rating{
            rating.append("*")
        }
        if item?.assetURL != nil{
            MPNowPlayingInfoCenter.default().nowPlayingInfo = [
                MPMediaItemPropertyTitle: item?.value(forProperty: MPMediaItemPropertyTitle)!,
                MPMediaItemPropertyArtist: item?.value(forProperty: MPMediaItemPropertyArtist)!,
                MPMediaItemPropertyAlbumTitle: rating,
                MPMediaItemPropertyArtwork: item?.artwork ?? UIImage()
            ]
        }
    }

func updatePlaybackRateData(){
        guard currentItem?.assetURL != nil else {
            duration = 0
            nowPlayingInfoCenter.nowPlayingInfo = nil
            return
        }
        duration = Float(player.duration)
        let item = currentItem
        MPNowPlayingInfoCenter.default().nowPlayingInfo = [
                    MPNowPlayingInfoPropertyElapsedPlaybackTime: player.currentTime,
                    MPNowPlayingInfoPropertyPlaybackRate: player.rate,
                    MPMediaItemPropertyPlaybackDuration: item?.playbackDuration
                ]
}

播放媒体的功能

func play(){
player.play()
timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(Plum.updatePlaybackRateData), userInfo: nil, repeats: true)
        timer.fire()
        NotificationCenter.default.post(name: Plum.playBackStateChanged, object: nil, userInfo: ["Artist": "Title"])
        updateGeneralMetadata()
}

正如您所看到的，我希望每秒更新播放速率和仅在更改媒体文件时更新常规元数据。当我同时拥有这两个函数时，似乎只有updateGeneralData（）有效，因为LS / CC上没有播放时间条当我在updatePlaybackRateData（）中放置所有信息（如title，artist，albumTitle，artwork，currentTime，rate和duration）时，一切都会显示出来，但我想在两种方法之间分割这些功能，以便每秒只更新必要的信息。

Answer 1

显然，下面的解决方案可以解决问题。我已经创建了新常量

let infoCC = MPNowPlayingInfoCenter.default()

并将方法更改为：

func updateGeneralMetadata() {
        guard player.url != nil, let _ = player.url else {
            infoCC.nowPlayingInfo = nil
            return
        }
        let item = currentItem
        var nowPlayingInfo = infoCC.nowPlayingInfo ?? [String: Any]()
        nowPlayingInfo[MPMediaItemPropertyTitle] = item?.title
        nowPlayingInfo[MPMediaItemPropertyArtist] = item?.albumArtist
        nowPlayingInfo[MPMediaItemPropertyAlbumTitle] = item?.albumTitle
        nowPlayingInfo[MPMediaItemPropertyArtwork] = item?.artwork
        infoCC.nowPlayingInfo = nowPlayingInfo
    }

    func updatePlaybackRateData(){
        guard currentItem?.assetURL != nil else {
            duration = 0
            infoCC.nowPlayingInfo = nil
            return
        }
        var nowPlayingInfo = infoCC.nowPlayingInfo ?? [String: Any]()
        duration = Float(player.duration)
        let item = currentItem
        nowPlayingInfo[MPNowPlayingInfoPropertyElapsedPlaybackTime] = player.currentTime
        nowPlayingInfo[MPNowPlayingInfoPropertyPlaybackRate] = player.rate
        nowPlayingInfo[MPMediaItemPropertyPlaybackDuration] = player.duration
        infoCC.nowPlayingInfo = nowPlayingInfo
}

希望将来可以帮助某人

Swift在控制中心中更新媒体元数据在两种方法

1 个答案: