Add 2 features into exiting iPhone application (Report viewer)

This app is an private report viewer. We want to add 2 new features: 1-. Give a new feature to an exisiting sourcecode to allow swipe left and right behind WebView Reports. 2-. Force to rotate to Landscape when showing reports and portrait orientation on login. Here is part of sourcecode: // // NavViewController.m #import "NavViewController.h" #import "DashboardViewController.h" #import "ChartsViewController.h" @interface NavViewController () @end @implementation NavViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. id currentViewController = [login to view URL]; if ([currentViewController isKindOfClass:[ChartsViewController class]]){ NSNumber *value = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeLeft]; [[UIDevice currentDevice] setValue:value forKey:@"orientation"]; } } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } /*-(BOOL)shouldAutorotate { id currentViewController = [login to view URL]; if ([currentViewController isKindOfClass:[DashboardViewController class]]) return NO; return YES; }*/ //- (UIInterfaceOrientationMask)supportedInterfaceOrientations { //id currentViewController = [login to view URL]; //if ([currentViewController isKindOfClass:[DashboardViewController class]]) // return UIInterfaceOrientationMaskPortrait;// | UIInterfaceOrientationMaskLandscapeLeft); //return UIInterfaceOrientationMaskLandscapeLeft; //} /*- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation == UIInterfaceOrientationPortrait); } -(BOOL)shouldAutorotate { return NO; }*/ -(NSUInteger)supportedInterfaceOrientations { return UIInterfaceOrientationMaskPortrait; } @end