212 lines
8.6 KiB
Swift
212 lines
8.6 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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didSet{
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DispatchQueue.main.async {
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[weak self] in
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guard let self = self else {return}
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if currentVideo != nil {
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print("当前播放音乐是:\(currentVideo?.song?.title ?? "")")
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//启动监听器
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startObservingCurrentVideoItem()
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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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//当前播放音乐
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var currentVideoId:String?
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//监听器
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private var itemObservation: NSKeyValueObservation?
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// private var loadQueue:DispatchQueue!
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///异步请求组
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// private var group:DispatchGroup!
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///单曲播放队列ViewModel
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var listViewVideos:[MPPositive_SongViewModel]!
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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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self.currentVideoId = currentVideoId
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}
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//启动对于当前音乐的监听器
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private func startObservingCurrentVideoItem() {
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itemObservation?.invalidate() // 先移除旧的监听
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//判断当前currentVideo是否已经加载完数据了
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if currentVideo?.resourcePlayerItem != nil {
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//数据已经加载完毕了
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postNoticeAction()
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}else {
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//添加新的监听
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itemObservation = currentVideo?.observe(\.resourcePlayerItem, options: [.new], changeHandler: { [weak self] video, change in
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guard let self = self else {return}
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if change.newValue != nil {
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// 在这里处理 newItem 的值变化
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postNoticeAction()
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}else {
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//获取到值是nil
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print("无效更新")
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}
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})
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}
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}
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//发起通知告诉播放器已经切换了播放音乐
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private func postNoticeAction() {
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DispatchQueue.main.async {
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[weak self] in
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guard let self = self else {return}
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if currentVideo != nil {
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MP_AnalyticsManager.shared.player_b_pvAction(currentVideo.song.videoId, videoname: currentVideo.title ?? "", artistname: currentVideo.song.shortBylineText ?? "")
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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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}
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}
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}
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///将选中Video的上1位，下两位项包括本身总计4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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//更新当前播放音乐ID
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self.currentVideoId = targetVideoId
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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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let lastIndex = targetIndex+2
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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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if lastIndex < randomVideos.count {
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array.append(self.randomVideos[lastIndex])
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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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let lastIndex = targetIndex+2
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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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if lastIndex < songVideos.count {
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array.append(self.songVideos[lastIndex])
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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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//全部转化为MPPositive_SongViewModel
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let viewModels = array.map({(MPPositive_SongViewModel($0))})
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//添加新的ViewModel
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self.listViewVideos.append(contentsOf: viewModels)
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//更新当前播放音乐
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self.currentVideo = self.listViewVideos.first(where: {$0.song.videoId == targetVideoId})
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//只保留最后7首
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self.listViewVideos = self.listViewVideos.suffix(7)
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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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currentVideo.configure()
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completion()
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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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///插入下一首播放
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func playNextAction(_ next:MPPositive_SongItemModel) {
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//获取当前播放音乐在顺序播放列表和随机播放列表中的下标
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if let index = songVideos.firstIndex(where: {$0.videoId == currentVideo?.song.videoId}) {
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//判断下一首会不会越界
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let nextIndex:Int = index + 1
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if songVideos.indices.contains(nextIndex) {
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//不会越界,可以插入
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songVideos.insert(next, at: nextIndex)
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}else {
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//越界了，只能添加到最后
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songVideos.append(next)
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}
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}
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//设置随机列表
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if let index = randomVideos.firstIndex(where: {$0.videoId == currentVideo?.song.videoId}) {
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//判断下一首会不会越界
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let nextIndex:Int = index + 1
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if randomVideos.indices.contains(nextIndex) {
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//不会越界,可以插入
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randomVideos.insert(next, at: nextIndex)
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}else {
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//越界了，只能添加到最后
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randomVideos.append(next)
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}
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}
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MP_HUD.success("Successfully added to next song".localizableString(), delay: 1.0) {
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print("用户将\(next.title ?? "")添加到下一首播放")
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}
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}
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//销毁时
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deinit {
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itemObservation?.invalidate()
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//释放所有数据
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songVideos = nil
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currentVideo = nil
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randomVideos = nil
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listViewVideos = nil
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}
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}
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