为 MPMediaItemArtwork 声明变量（init() 不可用）

Posted 2023-03-14

【中文标题】为 MPMediaItemArtwork 声明变量（init() 不可用）

【英文标题】：Declaring Variable for MPMediaItemArtwork (init() is unavailable)

【发布时间】：2017-07-26 17:47:24

【问题描述】：

我正在像这样为控制中心创建专辑封面：

func updateNowPlayingCenter (title: String, artist: String, PlaybackRate: Double)
        var artwork = MPMediaItemArtwork()
        let image:UIImage = UIImage(named: title)!
        if #available(ios 10.0, *) 
            artwork = MPMediaItemArtwork.init(boundsSize: image.size, requestHandler:  (size) -> UIImage in
                return image
            )
         else 
            artwork = MPMediaItemArtwork(image: image)
        


        var songInfo: Dictionary <NSObject, AnyObject> = [

            MPMediaItemPropertyTitle as NSObject: title as AnyObject,

            MPMediaItemPropertyArtist as NSObject: artist as AnyObject,

            MPMediaItemPropertyArtwork as NSObject: artwork as AnyObject,

            MPMediaItemPropertyPlaybackDuration as NSObject: audioPlayer.duration as AnyObject,

            MPNowPlayingInfoPropertyElapsedPlaybackTime as NSObject: audioPlayer.currentTime as AnyObject,

            MPNowPlayingInfoPropertyPlaybackRate as NSObject: PlaybackRate as AnyObject

        ]


        MPNowPlayingInfoCenter.default().nowPlayingInfo = songInfo as [NSObject : AnyObject] as! [String : Any]

    

但我得到了错误

init() 不可用

上线artwork = MPMediaItemArtwork()。那么，如何为artwork 声明一个变量，以便在MPMediaItemPropertyArtwork as NSObject: artwork as AnyObject, 行上调用它？

【参考方案1】：

好的，很简单的修复。我刚换了

if #available(iOS 10.0, *) 
            artwork = MPMediaItemArtwork.init(boundsSize: image.size, requestHandler:  (size) -> UIImage in
                return image
            )
         else 
            artwork = MPMediaItemArtwork(image: image)
        

与

let artwork = MPMediaItemArtwork(image: image)