To add Login support in your application,

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

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

1. Initialize CometChat object

CometChat *cometchat =  [[CometChat alloc] initWithAPIKey:@”Your API Key”];

2. Login to CometChat
Login to CometChat Cloud by any of the 2 available methods.

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

- (void)loginWithUserID:(NSString *)userID
             success:(void(^)(NSDictionary *response))response
             failure:(void(^)(NSError *error))failure; 

Return type: void
Callback Blocks:
(i). (void(^)(NSDictionary *response))response
Invocation: After the login operation is completed successfully
Response: NSDictionary containing login success message
Eg:

{
      "message"="Login Successful";
} 

(ii). (void(^)(NSError *error))failure
Invocation: If there’s an error while performing the login operation
Response: NSError containing error code and message
Usage:

[cometchat loginWithUserID:@”5” 
                success:^(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
                  success:(void(^)(NSDictionary *response))response
                  failure:(void(^)(NSError *error))failure;

Return type: void
Callback Blocks:
(i). (void(^)(NSDictionary *response))response
Invocation: After the login operation is completed successfully
Response: NSDictionary containing login success message
Eg:

{
	"message"="Login Successful";
}

(ii). (void(^)(NSError *error))failure
Invocation: If there’s an error while performing the login operation
Response: NSError containing error code and message
Usage:

[cometchat loginWithUsername:@”Tony Stark”
                    password:@”password” 
                     success:^(NSDictionary *response) {
                   } failure:^(NSError *error) {
    	}];

Once you have logged-in to CometChat you can use all other features and functionalities available in CometChat SDK.

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

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

Return type: void
Callback Blocks:
(i). (void(^)(NSDictionary *response))response
Invocation: After the logout operation is completed
Response: NSDictionary containing logout message.

(ii). (void(^)(NSError *error))failure
Invocation: If there’s an error while performing the logout operation
Response: NSError containing error code and message
Usage:

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