IOS學習筆記(二)之應用程式UI基礎

         

#pragma mark invoke after application loaded- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{        NSLog(@"載入完畢...");    //init window    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];    // Override point for customization after application launch.    // 傳入xib檔案名稱來init controller    self.viewController = [[[PPSViewController alloc] initWithNibName:@"PPSViewController" bundle:nil] autorelease];    // setting the root view of Window    self.window.rootViewController = self.viewController;    // 下面的代碼和上面一條設定跟view效果一樣    // [self.window addSubview:self.viewController.view];    [self.window makeKeyAndVisible]; //view可見    return YES;}

     同時在根視圖上面，我們還可以添加子視圖。所有的控制項都會繼承UIView;

- (void)viewDidLoad{       [super viewDidLoad];    // 設定介面的背景        [self.view setBackgroundColor:[UIColor redColor]];        CGRect frame=CGRectMake(10, 170, 300, 50);       // 使用指定的矩形進行建立標籤        UILabel *lable= [[UILabel alloc]initWithFrame:frame];        lable.text=@"Hello,我是被添加的子視圖";        lable.textColor=[UIColor redColor];            [self.view addSubview:lable];}

    運行結果如下: