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;

}