1. Add the CometChat SDK to your app:

Drag the MessageSDKFramework.framework into your Xcode project folder target. Make sure the “Copy items to destination’s group folder” checkbox is checked.

2. Add Dependencies:

Click on Targets → Your app name → and then the ‘Build Phases’ tab.
Expand ‘Link Binary With Libraries’ as given below. And add following frameworks.

3. Add Linker Flag:

Click on Targets → Your app name → and then the ‘Build Settings’ tab.
Scroll down to the ‘Linking’ section, and double-click to the right of where it says ‘Other Linker Flags’. Click on the “+” button to add the following:

CometChat allows users to converse through One-on-One Chat as well as Chatrooms

To add Login support in your application,

Include the class <MessageSDKFramework/MessageSDK.h> in the .h file of your class.

All the method calls will invoke their respective callback blocks as defined below.

1. Initialize MessageSDK object

MessageSDK *msgSDK =  [[MessageSDK alloc] initWithApi:@"API-Key"];

2. Login to CometChat
Login to CometChat by any of the 2 available methods. Please make sure that your chatlogin() function in integration.php should be configured to handle any of the login mechanisms you opt for.

a) You can login to CometChat using the userID. All data related to the previous user will be cleared.

- (void)loginWithID:(NSString *)username
           observer:(UIViewController *)currentView
            success:(void (^)(NSDictionary *))success
           userinfo:(void (^)(NSDictionary *))userinfo
       chatroominfo:(void (^) (NSDictionary *))chatroominfo
   onMessageReceive:(void (^) (NSDictionary *))onMessageReceive
            failure:(void (^)(NSError *))failure; 

Return type: void
Usage:

[msgSDK loginWithID:@"5" observer:self success:^(NSDictionary *response) {
              
        } userinfo:^(NSDictionary *response) {
             
        } chatroominfo:^(NSDictionary *response) {
              
        } onMessageReceive:^(NSDictionary *response) {
              
        } failure:^(NSError *error) {
              
        }];

b) You can also login to CometChat using the username and password. All data related to the previous user will be cleared.

- (void)loginWithUsername:(NSString *)username
                 password:(NSString *)password
                 observer:(UIViewController *)currentView
                  success:(void (^)(NSDictionary *))success
                 userinfo:(void (^)(NSDictionary *))userinfo
             chatroominfo:(void (^) (NSDictionary *))chatroominfo
         onMessageReceive:(void (^) (NSDictionary *))onMessageReceive
                  failure:(void (^)(NSError *))failure;

Return type: void

Usage:

[msgSDK loginWithUsername:"John" password:"password" observer:self success:^(NSDictionary *response) {
             
        } userinfo:^(NSDictionary *response) {
             
        } chatroominfo:^(NSDictionary *response) {
            
        } onMessageReceive:^(NSDictionary *response) {
             
        } failure:^(NSError *error) {
             
        }];

With these callback, we have added following new functions which are as follows:

userinfo callback : This function will provide developer with firebase channel for One-on-One Messages and Announcement messages values. The response JSON will be in following format:

{
    "push_an_channel" = "ANN_08dd0d0d94b475e429320f76a48b06fei";
    "push_channel" = "C_339dbd60e377fbef6307320f26b93355i";
}

chatroominfo callback : This function will provide developer with firebase channel and other information for a chatroom when the user joins/leave the chatroom. The response JSON will be in following format:
i] join chatroom response :

{
    action = join;
    id = 28;
    "push_channel" = "C_555dbd60e377fbef9657320f26b45855i";
}

ii] leave chatroom response :

{
    action = leave;
    id = 28;
}

onMessageReceive callback : This function will be triggered whenever the message is received in One-On-One and Chatroom. The response JSON will be in following format:
i] One-On-One message :

{
    "message_id" = 47;
    "user_id" = 98;
}

ii] Chatroom message :

{
    "chatroom_id" = 1;
    "message_id" = 1061;
    "user_id" = 55;
}

3. Launch chat with window
In order to open the chat with specific user, use chatWith method. The syntax for this function is as follows:

- (void)chatWith:(NSString *)userid
   setBackButton:(BOOL)flag
        observer:(UIViewController *)currentView
         success:(void (^)(NSDictionary *))success
         failure:(void (^)(NSError *))failure;

Note : The user name will be displayed at the status bar if the user is online.

Return type: void

Usage:

[msgSDK chatWith:@"10" setBackButton:YES observer:self success:^(NSDictionary *response) {
       
    } failure:^(NSError *error) {
        
    }];

4. Logout
Calling this function will end the current session and clears user data

- (void)logoutWithSuccess:(void (^)(NSDictionary *))success
                  failure:(void (^)(NSError *))failure;

Usage:

[msgSDK logoutWithSuccess:^(NSDictionary *response) {
        
    } failure:^(NSError *error) {
        
    }];