临时JSON数据-Swift

问题描述

因此，我尝试根据侦听器是调到播客还是广播电台来创建临时JSON。

因为我们已经有了所有播客信息，所以不需要向远程JSON询问它。但是我们仍然需要具有以下能力：当MusicPlayer在View中播放时，它可以显示封面，艺术家和标题。

所以我的想法是在MusicPlayer类中以及媒体播放器将数据发送到以下内容时创建一个简单的JSON Struct

func getArtBoard(artist: String,song: String,cover: String) {
    
    
    guard let url = URL(string: cover) else { return }
    getData(from: url) { [weak self] image in
        guard let self = self,let downloadedImage = image else {
                return
        }
        let artwork = MPMediaItemArtwork.init(boundsSize: downloadedImage.size,requestHandler: { _ -> UIImage in
            return downloadedImage
        })
        self.Nowplaying(with: artwork,artist: artist,song: song)
    }
}

它还会将其保存到-

内部

class MusicPlayer {
struct NowPlaying: Codable,Identifiable {
    var id: ObjectIdentifier
    var artist : String
    var song : String
    var cover : String
}
//more code here
}

但是我遇到两个错误

类型“ MusicPlayer.NowPlaying”不符合协议“可解码”
类型“ MusicPlayer.NowPlaying”不符合协议“可编码”

问题：

我如何使其符合标准。 -但是我们可以通过Music.NowPlaying调用它。
这是最好的方法吗？还是可以在View中访问MPMediaItemPropertyTitle？

完整代码。

import Foundation
import AVFoundation
import MediaPlayer
import AVKit

class MusicPlayer {
static let shared = MusicPlayer()
static var mediatype = ""
struct NowPlaying: Codable,Identifiable {
    var id: ObjectIdentifier
    var artist : String
    var song : String
    var cover : String
}



var player: AVPlayer?
let playerViewController = AVPlayerViewController()

    
    func gettype(completion: @escaping (String) -> Void){
        
          completion(MusicPlayer.mediatype)
     
    }
    
    func getNowPlayingView(completion: @escaping (String) -> Void){
        
          completion(MusicPlayer.mediatype)
     
    }

    func startBackgroundMusic(url: String,type:String) {
        
        MusicPlayer.mediatype = String(type)
        
        //let urlString = "http://stream.radiomedia.com.au:8003/stream"
        let urlString = url
        guard let url = URL.init(string: urlString) else { return }

        let playerItem = AVPlayerItem.init(url: url)
        player = AVPlayer.init(playerItem: playerItem)
        
      
        do {

            try AVAudioSession.sharedInstance().setCategory(.playback,mode: .default,options: [.duckOthers,.defaultToSpeaker,.mixWithOthers,.allowAirPlay])
            print("Playback OK")
           // let defaults = UserDefaults.standard
           // defaults.set("1",forKey: defaultsKeys.musicplayer_connected)
            try AVAudioSession.sharedInstance().setActive(true)
            print("Session is Active")
        } catch {
           // let defaults = UserDefaults.standard
          //  defaults.set("0",forKey: defaultsKeys.musicplayer_connected)
            print(error)
        }

         #if targetEnvironment(simulator)

        self.playerViewController.player = player
        self.playerViewController.player?.play()
        print("SIMULATOR")

         #else

        self.setupRemoteTransportControls()
        player?.play()

        #endif

    }
    
    
    func startBackgroundMusicTwo() {

        
        let urlString = "http://stream.radiomedia.com.au:8003/stream"
        //let urlString = url
        guard let url = URL.init(string: urlString) else { return }

        let playerItem = AVPlayerItem.init(url: url)
        player = AVPlayer.init(playerItem: playerItem)
        
      
        do {

            try AVAudioSession.sharedInstance().setCategory(.playback,forKey: defaultsKeys.musicplayer_connected)
            print(error)
        }

         #if targetEnvironment(simulator)

        self.playerViewController.player = player
        self.playerViewController.player?.play()
        print("SIMULATOR")

         #else

        self.setupRemoteTransportControls()
        player?.play()

        #endif

    }




func setupRemoteTransportControls() {
   // Get the shared MPRemoteCommandCenter
    let commandCenter = MPRemoteCommandCenter.shared()

    // Add handler for Play Command
    commandCenter.playCommand.addTarget { [uNowned self] event in
        if self.player?.rate == 0.0 {
            self.player?.play()
            return .success
        }
        return .commandFailed
    }

    // Add handler for Pause Command
    commandCenter.pauseCommand.addTarget { [uNowned self] event in
        if self.player?.rate == 1.0 {
            self.player?.pause()
            return .success
        }
        return .commandFailed
    }

   // self.Nowplaying(artist: "Anna",song: "test")


}

func Nowplaying(with artwork: MPMediaItemArtwork,artist: String,song: String){

MPNowPlayingInfoCenter.default().NowPlayingInfo = [
      MPMediaItemPropertyTitle:song,MPMediaItemPropertyArtist:artist,MPMediaItemPropertyArtwork: artwork,MPNowPlayingInfoPropertyIsLiveStream: true
]


   // self.getArtBoard();
}


func setupNowPlayingInfo(with artwork: MPMediaItemArtwork) {
      MPNowPlayingInfoCenter.default().NowPlayingInfo = [
        //   MPMediaItemPropertyTitle: "Some name",//   MPMediaItemPropertyArtist: "Some name",//MPMediaItemPropertyPlaybackDuration: CMTimeGetSeconds(currentItem.duration),//MPNowPlayingInfoPropertyPlaybackRate: 1,//MPNowPlayingInfoPropertyElapsedplaybackTime: CMTimeGetSeconds(currentItem.currentTime())
       ]
   }



func getData(from url: URL,completion: @escaping (UIImage?) -> Void) {
    URLSession.shared.dataTask(with: url,completionHandler: {(data,response,error) in
        if let data = data {
            completion(UIImage(data:data))
        }
    })
        .resume()
}

func getArtBoard(artist: String,song: song)
    }
}



    func stopBackgroundMusic() {
        guard let player = player else { return }
        player.pause()

}
}

更新

由于以下评论，解决了以上错误。

但是在获取数据时遇到了问题。

Type 'MusicPlayer.NowPlayingData.Type' cannot conform to 'encodable'; only struct/enum/class types can conform to protocols

我使用的代码。 -https://developer.apple.com/documentation/foundation/jsonencoder

let encoder = JSONEncoder()
    encoder.outputFormatting = .prettyPrinted

    let data = try encoder.encode(NowPlayingData)
    print(String(data: data,encoding: .utf8)!)

要写的是我写的

func getArtBoard(artist: String,cover: String) {
    MusicPlayer.NowPlayingData(artist: artist,song: song,cover: cover)
}

数据尝试编码

func getArtBoard(artist: String,cover: String) {
    //MusicPlayer.NowPlayingData(artist: artist,cover: cover)
    let pear = "{'artist':\(artist),'song': \(song),'cover':\(cover)}"
    let encoder = JSONEncoder()
    encoder.outputFormatting = .prettyPrinted
    MusicPlayer.JN = try encoder.encode(pear)

解决方法

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avkit json swift swift swift swift