从AVPlayer设置MPNowPlayingInfoCenter持续时间?

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问题描述

我正在尝试设置MPNowPlayingInfoCenter，大多数键值对都可以正常工作，但是播放时间存在一些问题

I am trying to set MPNowPlayingInfoCenter, most of the key-value pairs work fine, but there is some kind of issue with playback time

let mpic = MPNowPlayingInfoCenter.defaultCenter()

mpic.nowPlayingInfo = [
    MPMediaItemPropertyArtwork:albumArtWork,
    MPMediaItemPropertyTitle:titleString,
    MPMediaItemPropertyArtist:artistName,
    MPMediaItemPropertyPlaybackDuration:99,
    MPNowPlayingInfoPropertyElapsedPlaybackTime:String(stringInterpolationSegment:self.myPlayer.currentItem?.currentTime()),
    MPNowPlayingInfoPropertyPlaybackRate:1.0
]

这有效，信息中心将正确开始计数.

this works and InfoCenter will correctly start counting.

我尝试尝试类似的方法

MPMediaItemPropertyPlaybackDuration:String(stringInterpolationSegment:self.myPlayer.currentItem?.duration())

它将失败.我应该将CMTime转换为两倍吗?我还应该访问其他财产吗?

it will fail. Should I be converting CMTime to double? Is there any other property I should access?

推荐答案

尝试一下

    let elapsedTime = NSNumber(double : CMTimeGetSeconds(AudioAvPlayer.currentItem!.currentTime()))
    let keys = NSArray(objects:
        MPMediaItemPropertyTitle,
        MPMediaItemPropertyArtist,
        MPMediaItemPropertyPlaybackDuration,
        MPNowPlayingInfoPropertyPlaybackRate,
        MPNowPlayingInfoPropertyElapsedPlaybackTime)
    let values = NSArray (objects:
        m_PlayContent.Title,
        m_PlayContent.Artist,
        m_PlayContent.Duration,
        NSNumber(integer: 1),
        elapsedTime)
    let mediaInfo = NSDictionary(objects: values as [AnyObject], forKeys: keys as! [NSCopying])
    MPNowPlayingInfoCenter.defaultCenter().nowPlayingInfo = mediaInfo as [NSObject : AnyObject]

持续时间应为String/like:02:24

duration should be as String / like : 02:24

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