编程入门教程

iOS通用应用程序

简介

通用的应用程序是为iPhone和iPad在一个单一的二进制文件中设计的应用程序。这有助于代码重用,并能够帮助更快进行更新。

实例步骤

1、创建一个简单的View based application(视图应用程序)

2、在文件查看器的右边,将文件ViewController.xib的文件名称更改为ViewController_iPhone.xib

3、选择"File -> New -> File... ",然后选择User Interface,再选择View,单击下一步

4、选择iPad作为设备,单击下一步:

5、将该文件另存为ViewController_iPad.xib,然后选择创建

6、在ViewController_iPhone.xib和ViewController_iPad.xibd的屏幕中心添加标签

7、在ViewController_iPhone.xib中选择identity inspector,设置custom class为ViewController

8、更新AppDelegate.m中的 application:DidFinishLaunching:withOptions方法

- (BOOL)application:(UIApplication *)application
  didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
   self.window = [[UIWindow alloc] initWithFrame:[[UIScreen 
   mainScreen] bounds]];
   // Override point for customization after application launch.
   if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
        self.viewController = [[ViewController alloc] 
        initWithNibName:@"ViewController_iPhone" bundle:nil];
   }
   else{
        self.viewController = [[ViewController alloc] initWithNibName:
        @"ViewController_iPad" bundle:nil];
   }
   self.window.rootViewController = self.viewController;
   [self.window makeKeyAndVisible];
   return YES;
}

9、在项目摘要中更新设备中为universal