Programmatically set root view controller in iphone

DemoDelegate.h

@class second;

@property (strong, nonatomic) second *s;

DemoDelegate.m

#import "second.h"

@synthesize s;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    // Override point for customization after application launch.

    self.window.backgroundColor = [UIColor whiteColor];

    [self.window makeKeyAndVisible];

   

    s = [[second alloc]initWithNibName:@"second" bundle:nil];

    self.window.rootViewController = s;

   

   

    return YES;

}