Authentication

//LoginViewController.h

#import <UIKit/UIKit.h>

@interface LoginViewController : UIViewController {
    IBOutlet UITextField *usernameField;
    IBOutlet UITextField *passwordField;
    IBOutlet UIButton *loginButton;
}

@property (nonatomic, retain) UITextField *usernameField;
@property (nonatomic, retain) UITextField *passwordField;
@property (nonatomic, retain) UIButton *loginButton;

- (IBAction) login: (id) sender;

@end

//LoginViewController.m

#import "LoginViewController.h"

@implementation LoginViewController

@synthesize usernameField, passwordField, oginButton, loginIndicator;

- (IBAction) login: (id) sender
{
    if([usernameField.text length] > 0 && [passwordField.text length] > 0){

        if([usernameField.text isEqualToString:@"admin"] && [passwordField.text isEqualToString:@"admin"]){

            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Authentication Success" message:@"Login Successful" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
            [alert show];

        } else {

            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Authentication Failed" message:@"Please check the username and password" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
            [alert show];

        }
    }
}