iPhone Hello World Application

main.m

// copyed from "iPhone Developer's Cookbook", Addison-Wesley 2009

#import <UIKit/UIKit.h>

@interface HelloWorldViewController : UIViewController
@end

@implementation HelloWorldViewController
- (void) loadView
{
    UIView *contentView = [[UIView alloc] initWithFrame: [[UIScreen mainScreen] applicationFrame]];
    contentView.backgroundColor = [UIColor lightGrayColor];

    UILabel *label = [[UILabel alloc] initWithFrame: CGRectMake(0.0f, 0.0f, 320.0f, 30.0f)];
    label.text = @"Hello World";
    label.center = contentView.center;
    label.textAlignment = UITextAlignmentCenter;
    label.backgroundColor = [UIColor clearColor];

    [contentView addSubview: label];
    [label release];

    self.view = contentView;
    [contentView release];
}
@end

@interface HelloWorldAppDelegate : NSObject <UIApplicationDelegate>
@end

@implementation HelloWorldAppDelegate
- (void) applicationDidFinishLaunching:(UIApplication *) application
{
    UIWindow *window = [[UIWindow alloc] initWithFrame: [[UIScreen mainScreen] bounds]];
    HelloWorldViewController *hwvc;
    hwvc = [[HelloWorldViewController alloc] init];
    [window addSubView: hwvc.view];
    [window makeKeyAndVisible];
}
@end

int main (int argc, char *argv[])
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    int retVal = UIApplicationMain(argc, argv, nil, @"HelloWorldAppDelegate");

    [pool release];
    return retVal;
}