iPhone app

// controller.m



@implementation HelloAgainViewController

-(IBAction) sayHello{
    NSString * out = [NSString stringWithFormat:@"Hello,%@",[txtName text]]; // settext to var

    [label setText:out]; // SET STRIMG TO LABEL FORM NSSTRING
    [txtName resignFirstResponder];// hide keybord
}


- (void)dealloc
{
    [super dealloc];
}

- (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.
}

#pragma mark - View lifecycle


// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
    [super viewDidLoad];
    [label setText:@""];
    [txtName setPlaceholder:@"Type your name"]; //ข้อความนำ

----------------------------------------------

// controller.h

#import <UIKit/UIKit.h>

@interface HelloAgainViewController : UIViewController {
    IBOutlet UILabel * label;
    IBOutlet UITextField * txtName;


}
-(IBAction) sayHello;

@end