最近有同学问到了关于微信语音连播的问题，在这里我将自己模仿微信语音连播的核心代码部分开源出来，供大家参考。仔细阅读，按照代码的思路就可以实现语音连播。
基本的思路就是：使用递归思想。点击语音消息，获取cell，判断（1）播放的消息是否正在播放，（2）播放的消息是否是点击的消息；然后进行播放，更新语音动画UI。播放完毕，需要在内存中的messageArray中查找下一条消息，通过消息找到cell，更新cell上的语音动画UI，播放该语音，更新数据库中的标记。然后继续下一条消息的播放。
- (void)clickCellVoice:(VMessageEntity *)model
{
__weak VChatsViewController *weakSelf = self;
// cell 的点击事件，
if (model)
{
VChatVoiceBaseCell *voiceCell = nil;
// 在可视化的cell上面用messageId查找与model对应的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)
{
//如果点击的cell的语音文件没有播放，则开始播放，同时开启语音播放动画。
if (![[VAudioPalyerManager sharedManager] isPlaying]) {
[voiceCell.playIcon startAnimating];
model.voiceMessage.isPlaying = YES;
[[VAudioPalyerManager sharedManager] playWithfile:model.voiceMessage.voicemd5
finishPlaying:^(NSString *fileName,BOOL isFinished) {
// 播放完成的回调，停止动画，开始播放下一条
[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，且与当前的文件名不同，停止播放当前的播放效果，播放另外一条。
{
[[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]])
// 处理当前正在播放的语音，停止当前的语音播放
{
[[VAudioPalyerManager sharedManager] stop];
model.voiceMessage.isPlaying = NO;
if([voiceCell.playIcon isAnimating])
{
[voiceCell.playIcon stopAnimating];
}
}
}
}
}
//递归查找下一条未读语音消息
- (void)playNextUnReadVoiceWithMessageEntity:(VMessageEntity *)model
{
//找到message在chatArray里面的位置
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)
{//判断是语音消息
if (messageEntity.readStatus == VMessageNoRead)
{
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
//取到下一条的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];
//更新数据库消息的未读状态,去掉未读标记
[voiceBaseCell receiveVoiceCellBeClick];
//更新数据库
[[VMessageManager sharedManager] updateReadStatusWithClientMessageId:
messageEntity.clientMessageId readStatus:VMessageHaveRead userId:messageEntity.sendUserId];
messageEntity.readStatus = VMessageHaveRead;
[weakSelf.messageArray replaceObjectAtIndex:i withObject:messageEntity];
//进行播放
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 则完整播放,再次调用这个方法
[weakSelf playNextUnReadVoiceWithMessageEntity:model];
}
}
}];
});
break;
}
}
}else{
NSLog(@"不是消息类型");
}
}
}
}
}
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