Multi view App Programatically - objective-c

Question

I want to know if it is possible to make multi view app without using the Interface Builder.
I know how to make it with just using Xcode and Storyboards, but I just want to be able make it programmatically.
For example : If I have a UIViewController A (default view) with a UIButton and than I have another UIViewController B with UIWebView so when I click on the UIButton of UIViewController A I want to be able to display the second View (Without IB).
How can I set the action to the UIButton to display my second View (Without Interface Builder) ?

Answer 1

You can add a target to your button:
[button addTarget:self action:#selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
Then in ControllerA, add this method:
-(void)buttonPressed:(id)sender
{
[self.superview addSubview:controllerB.view];
[self.view removeFromSuperview];
}

Answer 2

On ViewControllerA
- (void)viewDidLoad
{
UIButton *btn=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[btn setFrame:CGRectMake(50.0f,200.0f,60.0f,30.0f)];
[btn setTitle:#"Next" forState:UIControlStateNormal];
[btn setTitleColor:[UIColor blackColor] forState:UIControlStateHighlighted];
[btn addTarget:self action:#selector(btnPressed:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
-(IBAction)btnPressed:(id)sender
{
NextViewController *nxt=[[NextViewController alloc]initWithNibName:nil bundle:nil];
[self.navigationController pushViewController:nxt animated:YES];
}
On viewControllerB
- (void)viewDidLoad
{
UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(0,0, 320, 460)];
NSURL *targetURL = [NSURL URLWithString:#"http://developer.apple.com/iphone/library/documentation/UIKit/Reference/UIWebView_Class/UIWebView_Class.pdf"];
NSURLRequest *request = [NSURLRequest requestWithURL:targetURL];
[webView loadRequest:request];
[self.view addSubview:webView];
}
Make sure that in AppDelegate.h should be navigation controller like this
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
UINavigationController* navController = [[UINavigationController alloc] initWithRootViewController:self.self.viewController ];
self.window.rootViewController = navController;
[self.window makeKeyAndVisible];
return YES;
}