iphone SDK - Tracking the field being edited

How to track the current field being edited in iphone SDK? Here is a sample code.

//

//  RegistrationFormViewController.h

//  RegistrationForm

//

//  Created by Raja on 1/10/11.

//  Copyright 2011 __MyCompanyName__. All rights reserved.

//

#import <UIKit/UIKit.h>

@interface RegistrationFormViewController : UIViewController {

IBOutlet UITextField *name;

IBOutlet UITextField *age;

IBOutlet UITextField *email;

IBOutlet UITextField *contactno;

IBOutlet UILabel *lblPreviousEdit;

IBOutlet UILabel *lblCurrentEdit;

}

@property (nonatomic, retain) UITextField *name;

@property (nonatomic, retain) UITextField *age;

@property (nonatomic, retain) UITextField *email;

@property (nonatomic, retain) UITextField *contactno;

@property (nonatomic, retain) UILabel *lblPreviousEdit;

@property (nonatomic, retain) UILabel *lblCurrentEdit;

@end

//

//  RegistrationFormViewController.m

//  RegistrationForm

//

//  Created by Raja on 1/10/11.

//  Copyright 2011 __MyCompanyName__. All rights reserved.

//

#import "RegistrationFormViewController.h"

@implementation RegistrationFormViewController

@synthesize name;

@synthesize age;

@synthesize email;

@synthesize contactno;

@synthesize lblPreviousEdit;

@synthesize lblCurrentEdit;

/*

 // The designated initializer. Override to perform setup that is required before the view is loaded.

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

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

 if (self) {

 // Custom initialization

 }

 return self;

 }

 */

/*

 // Implement loadView to create a view hierarchy programmatically, without using a nib.

 - (void)loadView {

 }

 */

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.

- (void)viewDidLoad {

    [super viewDidLoad];

}

/*

 // Override to allow orientations other than the default portrait orientation.

 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {

 // Return YES for supported orientations

 return (interfaceOrientation == UIInterfaceOrientationPortrait);

 }

 */

- (BOOL) textFieldShouldBeginEditing:(UITextField *) textField {

switch ([textField tag]) {

case 0:

[lblCurrentEdit setText:@"Name field is being edited."];

break;

case 1:

[lblCurrentEdit setText:@"Age field is being edited."];

break;

case 2:

[lblCurrentEdit setText:@"Email field is being edited."];

break;

case 3:

[lblCurrentEdit setText:@"Contactno field is being edited."];

break;

default:

break;

}

return YES;

}

- (BOOL) textFieldDidEndEditing:(UITextField *) textField {

switch ([textField tag]) {

case 0:

[lblPreviousEdit setText:@"Name field  edited."];

break;

case 1:

[lblPreviousEdit setText:@"Age field  edited."];

break;

case 2:

[lblPreviousEdit setText:@"Email field  edited."];

break;

case 3:

[lblPreviousEdit setText:@"Contactno field  edited."];

break;

default:

break;

}

return YES;

}

- (void)didReceiveMemoryWarning {

// Releases the view if it doesn't have a superview.

[super didReceiveMemoryWarning];

// Release any cached data, images, etc that aren't in use.

}

- (void)viewDidUnload {

// Release any retained subviews of the main view.

// e.g. self.myOutlet = nil;

}

- (void)dealloc {

[name release];

[age release];

[email release];

[contactno release];

[super dealloc];

}

@end