Message Withdraw

/*!
*  Withdraw message
*
*  Asynchronous method
*
*  @param aMessageId           Message Id
*  @param aCompletionBlock     Completed callback
*/
- (void)recallMessageWithMessageId:(NSString *)aMessageId
                        completion:(void (^)(AgoraError *aError))aCompletionBlock;
           
// Call:
[[AgoraChatClient sharedClient].chatManager recallMessageWithMessageId:messageId completion:^(AgoraError *aError) {
    if (!aError) {
        NSLog(@"Withdraw the message successfully");
    } else {
        NSLog(@"Reasons for failure to withdraw the message--- %@", aError.errorDescription);
    }
}];

/*!
 *  withdrawn Received message 

 *
 *  @param aMessages  Withdraw messages list<AgoraMessage>
 */
- (void)messagesDidRecall:(NSArray *)aMessages;