ADAL iOS

step 1: get token

+ (void)getToken:(void (^)(NSString*))completionBlock;
{
    ADAuthenticationError *error = nil;
    authContext = [ADAuthenticationContext authenticationContextWithAuthority:@"https://login.microsoftonline.com/common"
                                                                        error:&error];

    [authContext acquireTokenWithResource:@"https://graph.windows.net"                 
                                 clientId:@"<Your Client ID>"                          // Comes from App Portal
                              redirectUri:[NSURL URLWithString:@"<Your Redirect URI>"] // Comes from App Portal
                          completionBlock:^(ADAuthenticationResult *result)
    {
        if (AD_SUCCEEDED != result.status){
            // display error on the screen
            [self showError:result.error.errorDetails];
        }
        else{
            completionBlock(result.accessToken);
        }
    }];
}

step 2: fetch resource with token

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:yourAppURL];
    NSString *authHeader = [NSString stringWithFormat:@"Bearer %@", accessToken];
    [request addValue:authHeader forHTTPHeaderField:@"Authorization"];

    NSOperationQueue *queue = [[NSOperationQueue alloc] init];

    [NSURLConnection sendAsynchronousRequest:request
                                       queue:queue
                           completionHandler:^(NSURLResponse *response, NSData *data, NSError *error)
    {
        // Process Response Here
    }];