最近有同學問到了關于微信語音連播的問題，在這里我將自己模仿微信語音連播的核心代碼部分開源出來，供大家參考。仔細閱讀，按照代碼的思路就可以實現語音連播。
基本的思路就是：使用遞歸思想。點擊語音消息，獲取cell，判斷（1）播放的消息是否正在播放，（2）播放的消息是否是點擊的消息；然后進行播放，更新語音動畫UI。播放完畢，需要在內存中的messageArray中查找下一條消息，通過消息找到cell，更新cell上的語音動畫UI，播放該語音，更新數據庫中的標記。然后繼續下一條消息的播放。
- (void)clickCellVoice:(VMessageEntity *)model
{
__weak VChatsViewController *weakSelf = self;
// cell 的點擊事件，
if (model)
{
VChatVoiceBaseCell *voiceCell = nil;
// 在可視化的cell上面用messageId查找與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)
{
//如果點擊的cell的語音文件沒有播放，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) {
// 播放完成的回調，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，且與當前的文件名不同，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];
}
}
}
}
}
//遞歸查找下一條未讀語音消息
- (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)
{//判斷是語音消息
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];
//更新數據庫消息的未讀狀態,去掉未讀標記
[voiceBaseCell receiveVoiceCellBeClick];
//更新數據庫
[[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,再次調用這個方法
[weakSelf playNextUnReadVoiceWithMessageEntity:model];
}
}
}];
});
break;
}
}
}else{
NSLog(@"不是消息類型");
}
}
}
}
}
如有疑問，歡迎加群討論：iOS--IM即時通訊交流群：551709117
或者
