รู้จัก IBOutlet และ IBAction กับ Interface Builder (iOS , iPhone , iPad)

- (IBAction)OKClick:(id)sender
{
    
    NSMutableString *text;
    text = [NSString stringWithFormat:@" สวัสดีครับคุณ %@",[txtName text]];
    
    lblResponse.text = text;
    
}

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
    __weak IBOutlet UITextField *txtName;
    
    __weak IBOutlet UILabel *lblResponse; 
}

- (IBAction)OKClick:(id)sender;

@end

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (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.
}

- (IBAction)OKClick:(id)sender
{
    
    NSMutableString *text;
    text = [NSString stringWithFormat:@" สวัสดีครับคุณ %@",[txtName text]];
    
    lblResponse.text = text;
    
}

@end