Creating User Interface for App Passcode Screen (AppPasscodeViewController)

Add UIAlertview and UITextField using the following code:

UIAlertView *passCodeAlertView = [[UIAlertView alloc] initWithTitle:@"Enter application passcode:"  
                            message:@"\n"                
                            delegate:self               
                          cancelButtonTitle:@"Log In"
                          otherButtonTitles:nil];
        CGRect frame = CGRectMake(12.0, 45.0, 260.0, 30.0);  //(20.0, 45.0, 245.0, 25.0) //(12.0, 64.0, 260.0, 30.0)
        UITextField *l_passCodeTextField = [[UITextField alloc] initWithFrame:frame];      
        l_passCodeTextField.placeholder = @"Passcode";      
        l_passCodeTextField.borderStyle = UITextBorderStyleRoundedRect;  //UITextBorderStyleBezel      
        l_passCodeTextField.keyboardAppearance = UIKeyboardAppearanceAlert;      
        l_passCodeTextField.secureTextEntry=YES;      
        l_passCodeTextField.keyboardType = UIKeyboardTypeDefault;      
        l_passCodeTextField.returnKeyType = UIReturnKeyDone;      
        l_passCodeTextField.autocapitalizationType=UITextAutocapitalizationTypeNone;      
        l_passCodeTextField.clearButtonMode = UITextFieldViewModeWhileEditing;      
        l_passCodeTextField.delegate = self;      
        l_passCodeTextField.tag = 100; 
           
        [l_passCodeTextField becomeFirstResponder];      
        [passCodeAlertView addSubview:l_passCodeTextField]; 
            
        [passCodeAlertView show];      
        [passCodeAlertView release];      
        [l_passCodeTextField release];