【环信征文】|两处小改动，解决环信V3.0官方版本关于转发的bug

    （本人github：https://github.com/BHAreslee）(若转载，请告知本人并附上原文链接，谢谢)
    
    最近接手了一个集成即时通讯功能的项目，用的是环信的SDK。用环信的接口可以快速实现即时通讯的很多功能。并且对官方demo稍加改动基本能够满足项目需求。真机测试时，发现图片的转发，每次都是转发失败。我开始以为是我集成时有疏漏，逐行检查代码。发现并不是我的问题。从app store下载的官方demo同样是转发失败！！坑我啊！！原因是ContactListSelectViewController这个控制器里无法正确获取到想转发的图片的缓存地址。
修改如下图：



ContactListSelectViewController.m
代码拷走直接用

- (BOOL)messageViewController:(EaseMessageViewController *)viewController

   didLongPressRowAtIndexPath:(NSIndexPath *)indexPath

{

    id object = [self.dataArray objectAtIndex:indexPath.row];

    if (![object isKindOfClass:[NSString class]]) {

        EaseMessageCell *cell = (EaseMessageCell *)[self.tableView cellForRowAtIndexPath:indexPath];

      //////////////////////////解决转发问题的代码///////////////////////////////

        EMImageMessageBody *imageBody = (EMImageMessageBody*)[cell.model.message body];

        EMMessageBodyType ty = cell.model.bodyType;

        if (ty == EMMessageBodyTypeImage) {

            NSString *str = cell.model.message == nil ? cell.model.thumbnailFileURLPath : [imageBody localPath];
[[NSUserDefaults standardUserDefaults] setValue:str  forKey:@"imgTosand"];

        }

      /////////////////////////解决转发问题的代码////////////////////////
[cell becomeFirstResponder];

        self.menuIndexPath = indexPath;
[self showMenuViewController:cell.bubbleView andIndexPath:indexPath messageType:cell.model.bodyType];

    }

    return YES;

}

ContactListSelectViewController是取数据，那么存数据要在ChatViewController控制器做存数据的操作。消息类型写死为EMChatTypeChat，是因为，不论是从单聊界面转发，还是从群聊界面转发，都只能转发给个人，所以这里写死，目前没有问题。
如下图：



ChatViewController.m
代码拷走直接用

#pragma mark - EMUserListViewControllerDelegate

- (void)userListViewController:(EaseUsersListViewController *)userListViewController

            didSelectUserModel:(id<IUserModel>)userModel

{

    if (!self.messageModel) {

        return;

    }

    if (self.messageModel.bodyType == EMMessageBodyTypeText) {

        EMMessage *message = [EaseSDKHelper sendTextMessage:self.messageModel.text to:userModel.buddy messageType:EMChatTypeChat messageExt:self.messageModel.message.ext];

        __weak typeof(self) weakself = self;
[[EMClient sharedClient].chatManager sendMessage:message progress:nil completion:^(EMMessage *aMessage, EMError *aError) {

            if (!aError) {

//                NSMutableArray *array = [NSMutableArray arrayWithArray:[self.navigationController viewControllers]];

                UIViewController *chatController = nil;

#ifdef REDPACKET_AVALABLE

                chatController = [[RedPacketChatViewController alloc] initWithConversationChatter:userModel.buddy conversationType:EMConversationTypeChat];

#else

                chatController = [[ChatViewController alloc]

                                  initWithConversationChatter:userModel.buddy conversationType:EMConversationTypeChat];

#endif

                chatController.title = userModel.nickname.length != 0 ? [userModel.nickname copy] : [userModel.buddy copy];

//                if ([array count] >= 3) {

//                    [array removeLastObject];

//                    [array removeLastObject];

//                }

//                [array addObject:chatController];

//                [weakself.navigationController setViewControllers:array animated:YES];
[weakself.navigationController popViewControllerAnimated:YES];

            } else {
[self showHudInView:self.view hint:Localized(@"transpondFail")];

            }

        }];

    } else if (self.messageModel.bodyType == EMMessageBodyTypeImage) {
[self showHudInView:self.view hint:Localized(@"transponding")];

        __weak typeof(self) weakSelf = self;

        NSString *localPath = [(EMImageMessageBody *)self.messageModel.message.body thumbnailLocalPath];

           //////////////////////////解决转发问题的代码////////////////////////////

        localPath = [[NSUserDefaults standardUserDefaults] valueForKey:@"imgTosand"];

           //////////////////////////解决转发问题的代码//////////////////////////

        UIImage *image = [UIImage imageWithContentsOfFile:localPath];

        void (^block)() = ^(EMMessage *message){

            EMImageMessageBody *imgBody = (EMImageMessageBody *)message.body;

            NSString *from = [[EMClient sharedClient] currentUsername];

            EMImageMessageBody *newBody = [[EMImageMessageBody alloc] initWithData:nil thumbnailData:[NSData dataWithContentsOfFile:imgBody.thumbnailLocalPath]];

            newBody.thumbnailLocalPath = imgBody.thumbnailLocalPath;

            newBody.thumbnailRemotePath = imgBody.thumbnailRemotePath;

            newBody.remotePath = imgBody.remotePath;

            EMMessage *newMsg = [[EMMessage alloc] initWithConversationID:userModel.buddy from:from to:userModel.buddy body:newBody ext:message.ext];

//            newMsg.chatType = message.chatType;//此为环信代码

            newMsg.chatType = EMChatTypeChat;//这里是我加的
[[EMClient sharedClient].chatManager sendMessage:newMsg progress:nil completion:^(EMMessage *message, EMError *error) {

                if (error) {
[weakSelf showHudInView:self.view hint:Localized(@"transpondFail")];
[weakSelf performSelector:@selector(backAction) withObject:nil afterDelay:1];

                    return ;

                }
[(EMImageMessageBody *)message.body setLocalPath:imgBody.localPath];
[[EMClient sharedClient].chatManager updateMessage:message completion:nil];


//                NSMutableArray *array = [NSMutableArray arrayWithArray:[weakSelf.navigationController viewControllers]];


#ifdef REDPACKET_AVALABLE

                RedPacketChatViewController *chatController = [[RedPacketChatViewController alloc] initWithConversationChatter:userModel.buddy conversationType:EMConversationTypeChat];

#else

                ChatViewController *chatController = [[ChatViewController alloc] initWithConversationChatter:userModel.buddy conversationType:EMConversationTypeChat];

#endif

                chatController.title = userModel.nickname.length != 0 ? userModel.nickname : userModel.buddy;

//                if ([array count] >= 3) {

//                    [array removeLastObject];

//                    [array removeLastObject];

//                }

//                [array addObject:chatController];

//                [weakSelf.navigationController setViewControllers:array animated:YES];
[weakSelf.navigationController popViewControllerAnimated:YES];//转发完跳回去

            }];

        };


        if (!image) {
[[EMClient sharedClient].chatManager downloadMessageThumbnail:self.messageModel.message progress:nil completion:^(EMMessage *message, EMError *error) {

                if (error) {
[weakSelf showHudInView:self.view hint:Localized(@"transpondFail")];
[weakSelf performSelector:@selector(backAction) withObject:nil afterDelay:1];

                    return ;

                }


                block(message);

            }];

        } else {

            block(self.messageModel.message);

        }

    }

}

上面一定要判断一下消息体类型，只有消息体为图片类型（EMMessageBodyTypeImage）才需要保存图片本地。如果不做判断的话，点击气泡马上崩掉。
个人感觉虽然能解决图片转发的问题，但并不是最好的解决办法，虽然对环信demo的代码改动最少。有更好的办法，欢迎在评论区交流。
（本人github：https://github.com/BHAreslee）(若转载，请告知本人并附上原文链接，谢谢)