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