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我正在尝试将视图控制器容器库添加到remail电子邮件客户端。这个想法是视图控制器容器 presents its child view controllers in two layers. It provides functionality for sliding the top view to reveal the views underneath it.

在库描述中，这是将子 controllerView 附加到其父级的建议方法：

if (![self.slidingViewController.underLeftViewController 
        isKindOfClass:[MenuViewController class]]) {
    self.slidingViewController.underLeftViewController  = 
        [self.storyboard instantiateViewControllerWithIdentifier:@"Menu"];
  }

滑动视图控制器在哪里the top-level instance of the view controller container. With this instance, you can set the view controllers underneath the top view and add panning.

我使用的是 xib 文件，而不是楼层板。所以我的代码看起来像这样：

if (![self.slidingViewController.underLeftViewController 
        isKindOfClass:[MenuViewController class]]) {
    self.slidingViewController.underLeftViewController  =
         [[MenuViewController alloc] initWithNibName:@"Menu" bundle:nil];
}

但使用该代码..我收到此错误：
-[__NSArrayM insertObject:atIndex:]: object cannot be nil

这可以追溯到slidingViewController 执行以下操作：
[self.view insertSubview:_underTopViewController.view atIndex:0];

查看文档..我看到instantiateViewControllerWithIdentifier和initWithNibName之间存在区别：前者始终返回一个对象..而后者仅加载the first time the view controller’s view is accessed。

问题：如何让 initWithNibName 返回加载的 viewcontroller 对象，而不管该视图是否已被访问......类似于 instantiateViewControllerWithIdentifier？

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1 回答 1

1

您应该可以通过访问view属性来触发它，例如；

if (![self.slidingViewController.underLeftViewController 
              isKindOfClass:[MenuViewController class]]) 
{
    MenuViewController *vc = 
      [[MenuViewController alloc] initWithNibName:@"Menu" bundle:nil];
    [vc view];  // <-- access the view and trigger loading
    self.slidingViewController.underLeftViewController  = vc;
}
于 2013-01-05T09:15:16.027 回答