Objective-C กับการสร้าง Event และ Action (IBAction) โต้ตอบ บน iOS (iPhone,iPad)

@interface ViewController : UIViewController
{
    IBOutlet UITextField *txtName; // for Text Field (Textbox)
    
    IBOutlet UILabel *lblResponse; // for Label
}

- (IBAction)Hello:(id)sender; // for Button Event

- (IBAction)Hello:(id)sender
{
    
    //lblResponse.text = txtName.text;
    //[lblResponse setText:[txtName text]];
    
    NSString *hello = @"สวัสดีครับคุณ ";
    NSString *name = txtName.text;
    NSString *message;
    message = [hello stringByAppendingString:name];
    
    lblResponse.text = message;
    
}

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
    IBOutlet UITextField *txtName; // for Text Field (Textbox)
    
    IBOutlet UILabel *lblResponse; // for Label
}

- (IBAction)Hello:(id)sender; // for Button Event

@end

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (IBAction)Hello:(id)sender
{
    
    //lblResponse.text = txtName.text;
    //[lblResponse setText:[txtName text]];
    
    NSString *hello = @"สวัสดีครับคุณ ";
    NSString *name = txtName.text;
    NSString *message;
    message = [hello stringByAppendingString:name];
    
    lblResponse.text = message;
    
}

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

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end