Objective-C

`NXMClient`

Before you can start a chat, the Client SDK needs to authenticate to the Vonage servers. The following additions are required to ViewController.m.

At the top of the file, import NexmoClient and User.

#import "ViewController.h"
#import "User.h"
#import <NexmoClient/NexmoClient.h>

Add a NXMClient instance and user property below the statusLabel.

@interface ViewController ()
    ...
    @property UILabel *statusLabel;
    @property NXMClient *client;
    @property User *user;
    
@end

Button targets

For the log in buttons to work, you need to add targets to them which will run a function when they are tapped. In the ViewController.m file add the following.

@implementation ViewController
    ...

- (void)viewDidLoad {
    ...
}

- (void)setUserAsAlice {
    self.user = User.Alice;
    [self login];
}

- (void)setUserAsBob {
    self.user = User.Bob;
    [self login];
}

Then link the two functions them to their respective buttons at the end of the viewDidLoad function.

- (void)viewDidLoad {
    ...

    [self.loginAliceButton addTarget:self action:@selector(setUserAsAlice) forControlEvents:UIControlEventTouchUpInside];
    [self.loginBobButton addTarget:self action:@selector(setUserAsBob) forControlEvents:UIControlEventTouchUpInside];
}

Add the log in function

At the end of ViewController.m, add the login function needed by the setUserAs functions. This function sets the client's delegate and logs in.

@implementation ViewController
    ...

- (void)login {
    [self.client setDelegate:self];
    [self.client loginWithAuthToken:self.user.jwt];
}

The client delegate

For the delegate to work, you need to have ViewController conform to NXMClientDelegate. To do this you will need to add the NXMClientDelegate to the interface definition for ViewController.m.

@interface ViewController () <NXMClientDelegate>

...

@end

Then at the end of the file, add the following NXMClientDelegate functions.

- (void)client:(NXMClient *)client didChangeConnectionStatus:(NXMConnectionStatus)status reason:(NXMConnectionStatusReason)reason {
    switch (status) {
        case NXMConnectionStatusConnected: {
            [self setStatusLabelText:@"Connected"];
            break;
        }
        case NXMConnectionStatusConnecting:
            [self setStatusLabelText:@"Connecting"];
            break;
        case NXMConnectionStatusDisconnected:
            [self setStatusLabelText:@"Disconnected"];
            break;
    }
}

- (void)client:(NXMClient *)client didReceiveError:(NSError *)error {
    [self setStatusLabelText:error.localizedDescription];
}

- (void)setStatusLabelText:(NSString *)newStatus {
    dispatch_async(dispatch_get_main_queue(), ^{
       self.statusLabel.text = newStatus;
    });
}