objective-c – 以模态方式呈现视图控制器 – iPad

- (void)add:(id)sender {
   // Create the root view controller for the navigation controller
   // The new view controller configures a Cancel and Done button for the
   // navigation bar.
   RecipeAddViewController *addController = [[RecipeAddViewController alloc]
                       initWithNibName:@"RecipeAddView" bundle:nil];
   addController.delegate = self;

   // Create the navigation controller and present it modally.
   UINavigationController *navigationController = [[UINavigationController alloc]
                             initWithRootViewController:addController];
   [self presentModalViewController:navigationController animated:YES];


   // The navigation controller is Now owned by the current view controller
   // and the root view controller is owned by the navigation controller,// so both objects should be released to prevent over-retention.
   [navigationController release];
   [addController release];
}

我的问题是如何实现此代码(我将把它放在buttonPress方法中)

我需要在头文件中定义任何内容吗？令我困惑的是,apple on提供了这个并且没有头文件,所以我不知道是否应该有什么？

代码引用了RecipieAddViewController,我还能用“UIViewController”来解决这个问题？

我在头文件中作为委​​托放了什么？我需要在其他地方设置吗？喜欢财产？

一旦我在buttonPress方法中复制此代码以使其工作,我还需要做些什么吗？

感谢并抱歉所有问题.