How to Use Xcode to write an Objective-C iPhone application

This programmer's guide provides an introduction to Xcode, Interface Builder and the iPhone simulator. Specifically, you'll learn how to write, build and test a simple "Hello World" application. For more information, including a complete overview of the process, take a look.

Objective-C code follows below:

The header file should look like this...

#import

@interface Hello_WorldViewController : UIViewController {

IBOutlet UILabel *label;

}

-(IBAction)hello:(id)sendr;

@end

The implementation file should look like...

#import "Hello_WorldViewController.h"

@implementation Hello_WorldViewController

-(IBAction)hello:(id)sendr{

label.text=@"Hello World!";

}

@end