Change background color

delegate.h
------------------

#import <UIKit/UIKit.h>

@interface second : UIViewController
{
    IBOutlet UIButton *B1;
    IBOutlet UIButton *B2;
    IBOutlet UIButton *B3;
}

-(IBAction)First:(id)sender;
-(IBAction)Second:(id)sender;
-(IBAction)Third:(id)sender;

@end

Viewcontroller.h

----------------------

#import "second.h"

@implementation second

-(IBAction)First:(id)sender

{

    self.view.backgroundColor = [UIColor redColor];

}

-(IBAction)Second:(id)sender

{

    self.view.backgroundColor = [UIColor greenColor];

}

-(IBAction)Third:(id)sender

{

    self.view.backgroundColor = [UIColor yellowColor];

}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) {

        // Custom initialization

    }

    return self;

}

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view from its nib.

}

- (void)viewDidUnload

{

    [super viewDidUnload];

    // Release any retained subviews of the main view.

    // e.g. self.myOutlet = nil;

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

    return (interfaceOrientation == UIInterfaceOrientationPortrait);

}

@end