174 lines
7.5 KiB
Swift
174 lines
7.5 KiB
Swift
//
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// MPPositive_PlayerLoadViewModel.swift
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// MusicPlayer
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//
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// Created by Mr.Zhou on 2024/5/9.
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//
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import UIKit
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///播放器管理ViewModel
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class MPPositive_PlayerLoadViewModel: NSObject {
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/// 单曲常规列表
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var songVideos:[MPPositive_SongItemModel]!
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///随机播放列表
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var randomVideos:[MPPositive_SongItemModel]!
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///当前播放音乐ViewModel
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var currentVideo:MPPositive_SongViewModel!{
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willSet{
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if newValue != nil {
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if currentVideo != nil {
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//当值变化时通知播放器页面，更新UI
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NotificationCenter.notificationKey.post(notificationName: .positive_player_reload, object: currentVideo)
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}else {
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//当值变化时通知播放器页面，更新UI
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NotificationCenter.notificationKey.post(notificationName: .positive_player_reload)
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}
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}
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}
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}
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///单曲播放队列ViewModel
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var listViewVideos:[MPPositive_SongViewModel]!
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///异步请求组
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var group:DispatchGroup?
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///palyer管理model初始化方法
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/// - Parameters:
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/// - songs: 全部歌曲列表
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/// - firstVideoId: 需要播放的第一首歌
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init(_ songs:[MPPositive_SongItemModel], currentVideoId: String) {
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super.init()
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self.songVideos = songs
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//根据列表生成一份随机播放列表
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self.randomVideos = self.songVideos.shuffled()
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self.listViewVideos = []
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}
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///将选中Video的上下2项包括本身总计3项Video进行补全转为ViewModel,并播放这首音乐
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func improveData(_ targetVideoId:String, isRandom:Bool = false) {
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//对于选中Video的集合
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var array:[MPPositive_SongItemModel] = []
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if isRandom {
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//获取targetVideoId的索引
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guard let targetIndex = self.randomVideos.firstIndex(where: {$0.videoId == targetVideoId}) else {
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return
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}
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array.append(self.randomVideos[targetIndex])
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//获取上一位
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let previousIndex = targetIndex-1
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if previousIndex >= 0 {
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array.append(self.randomVideos[previousIndex])
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}
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let nextIndex = targetIndex+1
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if nextIndex < randomVideos.count {
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array.append(self.randomVideos[nextIndex])
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}
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}else {
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//获取targetVideoId的索引
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guard let targetIndex = self.songVideos.firstIndex(where: {$0.videoId == targetVideoId}) else {
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return
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}
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array.append(self.songVideos[targetIndex])
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//获取上一位
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let previousIndex = targetIndex-1
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if previousIndex >= 0 {
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array.append(self.songVideos[previousIndex])
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}
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let nextIndex = targetIndex+1
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if nextIndex < songVideos.count {
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array.append(self.songVideos[nextIndex])
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}
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}
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//获取完成，优先检索ViewModel，看看是否已存在补完video
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let videoIDs = Set(listViewVideos.map({$0.song.videoId}))
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//比较videoID,去掉已经补完的内容
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array = array.filter({!videoIDs.contains($0.videoId)})
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group = DispatchGroup()
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//去重完毕,对剩下内容补完
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for item in array {
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group?.enter()
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//补全歌词id和相关内容id
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improveDataforLycirsAndRelated(item) {[weak self] (result) in
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item.lyricsID = result.0
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item.relatedID = result.1
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self?.group?.leave()
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}
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group?.enter()
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//补全资源路径组和封面路径组
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improveDataforResouceAndCover(item) {[weak self] resourceUrls, coverUrls in
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item.resourceUrls = resourceUrls.1
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item.audioUrls = resourceUrls.0
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item.coverUrls = coverUrls
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//补全完成,转化为ViewModel，并添加进listViewVideos
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self?.listViewVideos.append(.init(item))
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self?.group?.leave()
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}
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}
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group?.notify(queue: .main, execute: {
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[weak self] in
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//确定播放音乐
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self?.currentVideo = self?.listViewVideos.first(where: {$0.song.videoId == targetVideoId})
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//只保留最后三首
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self?.listViewVideos = self?.listViewVideos.suffix(3)
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self?.group = nil
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})
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}
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///重新获取指定歌曲资源
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func remakeImproveData(_ completion:@escaping (() -> Void)) {
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//当前歌曲不能播放，需要重新配置资源
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improveDataforResouceAndCover(currentVideo.song) {[weak self] resourceUrls, coverUrls in
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guard let self = self else {return}
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currentVideo.song.resourceUrls = resourceUrls.1
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currentVideo.song.audioUrls = resourceUrls.0
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//成功更新资源，将重新补完的歌曲，放进listViewVideos中
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listViewVideos.forEach({ item in
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if item.song.videoId == self.currentVideo.song.videoId {
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item.song.resourceUrls = self.currentVideo.song.resourceUrls
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item.song.audioUrls = self.currentVideo.song.audioUrls
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}
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})
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currentVideo.resourceAsset = .init(url: .init(string: currentVideo.song.resourceUrls!.first!)!)
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currentVideo.resourcePlayerItem = .init(asset: currentVideo.resourceAsset!)
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//当值变化时通知播放器页面，更新UI
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NotificationCenter.notificationKey.post(notificationName: .positive_player_reload)
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completion()
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}
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}
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///移除选中的song，并更新listViewVideos，移除相同index的值
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func removeData(_ targetVideoId:String) {
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let targetIndex = songVideos.firstIndex(where: {$0.videoId == targetVideoId}) ?? 0
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//将选中的音乐移除，同时更新listView
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songVideos = songVideos.filter({$0.videoId != targetVideoId})
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randomVideos = randomVideos.filter({$0.videoId != targetVideoId})
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listViewVideos = listViewVideos.filter({$0.song.videoId != targetVideoId})
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if currentVideo != nil {
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//判断是否当前音乐
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if currentVideo.song.videoId == targetVideoId {
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//判断targetIndex是否大于最大音乐值
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if targetIndex < songVideos.count {
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let videoId = songVideos[targetIndex].videoId ?? ""
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improveData(videoId)
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}else {
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//移除的是原来最后一首音乐，播放新的最后一首音乐
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let videoId = songVideos.last?.videoId ?? ""
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improveData(videoId)
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}
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}
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}
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}
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///调用next对单曲数据歌词ID与相关ID补全
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private func improveDataforLycirsAndRelated(_ song:MPPositive_SongItemModel, completion:@escaping(((String?,String?)) -> Void)) {
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//单曲补全需要再次调用next接口
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MP_NetWorkManager.shared.requestNextLyricsAndRelated(song){ result in
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completion(result)
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}
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}
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///调用player对资源路径和封面路径补全
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private func improveDataforResouceAndCover(_ song:MPPositive_SongItemModel, completion:@escaping((([String],[String]), [String]?) -> Void)) {
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//单曲补全需要调用player接口
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MP_NetWorkManager.shared.requestPlayer(song) { resourceUrls, coverUrls in
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completion(resourceUrls,coverUrls)
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}
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}
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}
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