Building Your First Project(Chapter 2 of The iPhone™ Developer’s Cookbook)

 1 #import <UIKit/UIKit.h>

 2 

 3 @interface HelloWorldViewController : UIViewController

 4 @end

 5 

 6 @implementation HelloWorldViewController

 7 - (void)loadView

 8 {

 9     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;

 }