iOS：集成环信EaseMobSDK单聊功能

当然在集成环信之前需要一些准备操作：

1、首先注册环信开发者账号,直接进入环信官网注册即可：http://www.easemob.com

2、按照文档一步一步将需要的文件全部拖入工程中：http://docs.easemob.com/start/start

以下是我集成的文件：使用

　　EaseUI集成：http://docs.easemob.com/start/300iosclientintegration/140easeuiuseguide

　　libEaseMobClientSDK.a包

　　ChatDemo-UI3.0中的ChatView中的聊天控制器

我主要使用EaseMob中这个EaseSDKHelper单例类来注册、登录、获取最新消息、推送等

在App启动程序时：

进入EaseSDKHelper单例类中,添加一些自定义的方法

#pragma mark - init easemob  注册环信

- (void)easemobApplication:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
                    appkey:(NSString *)appkey
              apnsCertName:(NSString *)apnsCertName
               otherConfig:(NSDictionary *)otherConfig
{
    //注册登录状态监听
//    [[NSNotificationCenter defaultCenter] addObserver:self
//                                             selector:@selector(loginStateChange:)
//                                                 name:KNOTIFICATION_LOGINCHANGE
//                                               object:nil];
    
    //注册AppDelegate默认回调监听
    [self _setupAppDelegateNotifications];
    
    //注册apns
    [self _registerRemoteNotification];
    
    //注册easemob sdk
    [[EaseMob sharedInstance] registerSDKWithAppKey:appkey
                                       apnsCertName:apnsCertName
                                        otherConfig:otherConfig];
    // 注册环信监听
    [self registerEaseMobLiteNotification];
    
    //启动easemob sdk
    [[EaseMob sharedInstance] application:application didFinishLaunchingWithOptions:launchOptions];
    [[EaseMob sharedInstance].chatManager setIsAutoFetchBuddyList:YES];
}

#pragma mark - EMChatManagerLoginDelegate  自动登录代理回调

// 自动登录开始回调
-(void)willAutoLoginWithInfo:(NSDictionary *)loginInfo error:(EMError *)error
{
//    UIAlertView *alertView = nil;
    if (error) {
//        alertView = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"prompt", @"Prompt") message:NSLocalizedString(@"login.errorAutoLogin", @"Automatic logon failure") delegate:nil cancelButtonTitle:NSLocalizedString(@"ok", @"OK") otherButtonTitles:nil, nil];
        
        //发送自动登陆状态通知
        [[NSNotificationCenter defaultCenter] postNotificationName:KNOTIFICATION_LOGINCHANGE object:@NO];
    }
    else{
//        alertView = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"prompt", @"Prompt") message:NSLocalizedString(@"login.beginAutoLogin", @"Start automatic login...") delegate:nil cancelButtonTitle:NSLocalizedString(@"ok", @"OK") otherButtonTitles:nil, nil];
        
        //将旧版的coredata数据导入新的数据库
        EMError *error = [[EaseMob sharedInstance].chatManager importDataToNewDatabase];
        if (!error) {
            [[EaseMob sharedInstance].chatManager loadDataFromDatabase];
            
            //获取数据
            [self loadConversations];
        }
    }
//    [alertView show];
}

// 自动登录结束回调
-(void)didAutoLoginWithInfo:(NSDictionary *)loginInfo error:(EMError *)error
{
//    UIAlertView *alertView = nil;
    if (error) {
//        alertView = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"prompt", @"Prompt") message:NSLocalizedString(@"login.errorAutoLogin", @"Automatic logon failure") delegate:nil cancelButtonTitle:NSLocalizedString(@"ok", @"OK") otherButtonTitles:nil, nil];
        
        //发送自动登陆状态通知
        [[NSNotificationCenter defaultCenter] postNotificationName:KNOTIFICATION_LOGINCHANGE object:@NO];
    }
    else{
        //获取群组列表
        [[EaseMob sharedInstance].chatManager asyncFetchMyGroupsList];
        
//        alertView = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"prompt", @"Prompt") message:NSLocalizedString(@"login.endAutoLogin", @"End automatic login...") delegate:nil cancelButtonTitle:NSLocalizedString(@"ok", @"OK") otherButtonTitles:nil, nil];
    }
    
//    [alertView show];
}

#pragma make - login easemob  用户登录

- (void)loginWithUsername:(NSString *)username
                 password:(NSString *)password
{
    [[EaseMob sharedInstance].chatManager asyncLoginWithUsername:username password:password completion:^(NSDictionary *loginInfo, EMError *error) {
        if (!error) {
            //设置自动登录
            [[EaseMob sharedInstance].chatManager setIsAutoLoginEnabled:YES];

            //获取数据
            [self loadConversations];
            
            //发送自动登陆状态通知
            [[NSNotificationCenter defaultCenter] postNotificationName:KNOTIFICATION_LOGINCHANGE object:@YES];
        }
    } onQueue:nil];
}

#pragma mark - load conversations 加载会话列表
-(void)loadConversations{
    
//    [[EaseMob sharedInstance].chatManager importDataToNewDatabase];
    
    //获取数据库中数据
    [[EaseMob sharedInstance].chatManager loadDataFromDatabase];
    
    // 当前登录用户回话对象列表
    NSArray *conversations = [[EaseMob sharedInstance].chatManager conversations];
    if (conversations.count == 0) {
         //从数据库conversation表获取
        conversations = [[EaseMob sharedInstance].chatManager loadAllConversationsFromDatabaseWithAppend2Chat:YES];
    }
    _conversations = conversations;
}

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