最近有同學問到了關於微信語音連播的問題，在這裡我將自己模仿微信語音連播的核心程式碼部分開源出來，供大家參考。仔細閱讀，按照程式碼的思路就可以實現語音連播。
基本的思路就是：使用遞迴思想。點選語音訊息，獲取cell，判斷（1）播放的訊息是否正在播放，（2）播放的訊息是否是點選的訊息；然後進行播放，更新語音動畫UI。播放完畢，需要在記憶體中的messageArray中查詢下一條訊息，通過訊息找到cell，更新cell上的語音動畫UI，播放該語音，更新資料庫中的標記。然後繼續下一條訊息的播放。
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- (void)clickCellVoice:(VMessageEntity *)model { __weak VChatsViewController *weakSelf = self; // cell 的點選事件， if (model) { VChatVoiceBaseCell *voiceCell = nil; // 在視覺化的cell上面用messageId查詢與model對應的VChatVoiceBaseCell， for (UITableViewCell *cell in [_tableView visibleCells]) { if ([cell isKindOfClass:[VChatVoiceBaseCell class]]) { VChatVoiceBaseCell *tempVoiceCell =(VChatVoiceBaseCell *)cell; if ( tempVoiceCell.message.messageId == model.messageId) { voiceCell = (VChatVoiceBaseCell *)cell; break; } } } if (voiceCell) { //如果點選的cell的語音檔案沒有播放，則開始播放，同時開啟語音播放動畫。 if (![[VAudioPalyerManager sharedManager] isPlaying]) { [voiceCell.playIcon startAnimating]; model.voiceMessage.isPlaying = YES; [[VAudioPalyerManager sharedManager] playWithfile:model.voiceMessage.voicemd5 finishPlaying:^(NSString *fileName,BOOL isFinished) { // 播放完成的回撥，停止動畫，開始播放下一條 [voiceCell.playIcon stopAnimating]; model.voiceMessage.isPlaying = NO; if (isFinished) { if (model.messageStatus == VMessageStatusNone && model.readStatus == VMessageNoRead) { [weakSelf playNextUnReadVoiceWithMessageEntity:model]; } } }]; }else if([[VAudioPalyerManager sharedManager]isPlaying] &&![model.voiceMessage.voicemd5 isEqualToString:[[VAudioPalyerManager sharedManager] currentFileName]]) //如果正在播放，且與當前的檔名不同，停止播放當前的播放效果，播放另外一條。 { [[VAudioPalyerManager sharedManager] stop]; [voiceCell.playIcon startAnimating]; model.voiceMessage.isPlaying = YES; [[VAudioPalyerManager sharedManager] playWithfile:model.voiceMessage.voicemd5 finishPlaying:^(NSString *fileName, BOOL isFinish) { [voiceCell.playIcon stopAnimating]; model.voiceMessage.isPlaying = NO; if (isFinish) { if (model.messageStatus == VMessageStatusNone && model.readStatus == VMessageNoRead) { [weakSelf playNextUnReadVoiceWithMessageEntity:model]; } } }]; }else if([[VAudioPalyerManager sharedManager]isPlaying] && [model.voiceMessage.voicemd5 isEqualToString:[[VAudioPalyerManager sharedManager] currentFileName]]) // 處理當前正在播放的語音，停止當前的語音播放 { [[VAudioPalyerManager sharedManager] stop]; model.voiceMessage.isPlaying = NO; if([voiceCell.playIcon isAnimating]) { [voiceCell.playIcon stopAnimating]; } } } } } //遞迴查詢下一條未讀語音訊息 - (void)playNextUnReadVoiceWithMessageEntity:(VMessageEntity *)model { //找到message在chatArray裡面的位置 model.readStatus = VMessageHaveRead; __weak VChatsViewController *weakSelf = self; if (model) { NSIndexPath *index = [NSIndexPath indexPathForRow: [self.messageArray indexOfObject:model] inSection:0]; if (index) { for (NSInteger i = index.row+1; i < self.messageArray.count; i++) { id tempObj = self.messageArray[i]; if ([tempObj isKindOfClass:[VMessageEntity class]]) { VMessageEntity *messageEntity = (VMessageEntity *)tempObj; if (messageEntity.messageType == VMessageTypeVoice && messageEntity.messageStatus == VMessageStatusNone) {//判斷是語音訊息 if (messageEntity.readStatus == VMessageNoRead) { dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ //取到下一條的cell VChatVoiceReceiveCell *voiceBaseCell = nil; for (UITableView *cell in [_tableView visibleCells]) { if ([cell isKindOfClass:[VChatVoiceReceiveCell class]]) { VChatVoiceReceiveCell *tempBaseCell = (VChatVoiceReceiveCell *)cell; if (tempBaseCell.message.messageId == messageEntity.messageId) { voiceBaseCell = (VChatVoiceReceiveCell *)cell;//找到cell } } } //找到cell，更新UI [voiceBaseCell.playIcon startAnimating]; //更新資料庫訊息的未讀狀態,去掉未讀標記 [voiceBaseCell receiveVoiceCellBeClick]; //更新資料庫 [[VMessageManager sharedManager] updateReadStatusWithClientMessageId: messageEntity.clientMessageId readStatus:VMessageHaveRead userId:messageEntity.sendUserId]; messageEntity.readStatus = VMessageHaveRead; [weakSelf.messageArray replaceObjectAtIndex:i withObject:messageEntity]; //進行播放 messageEntity.voiceMessage.isPlaying = YES; [[VAudioPalyerManager sharedManager] playWithfile:messageEntity.voiceMessage.voicemd5 finishPlaying:^(NSString *fileName, BOOL isFinish) { [voiceBaseCell.playIcon stopAnimating]; messageEntity.voiceMessage.isPlaying = NO; if (isFinish) { if (model.messageStatus == VMessageStatusNone) { //isFinish == yes 則完整播放,再次呼叫這個方法 [weakSelf playNextUnReadVoiceWithMessageEntity:model]; } } }]; }); break; } } }else{ NSLog(@"不是訊息型別"); } } } } } |