At first add that three elements(TextField,Label and Button) on your user interface designer file. The idea of this application is so simple. If you write something in your text field. It will show the message via label and alert.

This is a single view application and for this application we just need to deal with ViewController.m and ViewController.h file. So here is my code

ViewController.h:

//ViewController.m

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
//Button Action
- (IBAction)changeWord:(id)sender;

//Outlet Label
@property (weak, nonatomic) IBOutlet UILabel *MyLabel;
//Outlet TextField
@property (weak, nonatomic) IBOutlet UITextField *MyTextField;

@end

ViewController.m:

#import "ViewController.h"

@implementation ViewController
@synthesize MyLabel;
@synthesize MyTextField;

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
}

- (void)viewDidUnload
{
    [self setMyLabel:nil];
    [self setMyTextField:nil];
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    }

- (void)viewWillDisappear:(BOOL)animated
{
	[super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
	[super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
        return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
    } else {
        return YES;
    }
}

- (IBAction)changeWord:(id)sender {
    NSString *message = [[NSString alloc]initWithFormat:@"%@",[MyTextField text]];
    UIAlertView *myAlert = [[UIAlertView alloc]initWithTitle:@"Alert"message:[MyTextField text]
        delegate:nil
        cancelButtonTitle:@"Okay"
        otherButtonTitles: nil];
    [myAlert show];

    [MyLabel setText:message];

    [MyTextField resignFirstResponder];//Dismiss the Keyboard
}
@end