[英] Monotouch: UINavigationController, override initWithRootViewController

问题描述

如何覆盖UINavigationController的构造函数传递一个rootViewController？

How is it possible to override the constructor for UINavigationController for passing in a rootViewController?

我会在Objective-C中有一个类似下面的方法：

I would have a method like the following in Objective-C:

-(id)initWithRootViewController:(UIViewController*)rootViewController
{
    UIViewController *fakeController = [[[UIViewController alloc] init] autorelease];
    if (self = [super initWithRootViewController:fakeController]) {

      self.fakeRootViewController = fakeController;

      rootViewController.navigationItem.hidesBackButton = YES;

      [self pushViewController:rootViewController animated:NO];
    } 
    return self;
}

提前感谢。尊敬的。

PS这段代码取自更改根视图控制器

：

感谢您的回复。我对以前的代码段感兴趣，因为它非常有趣。

Thank you for your replies. I was interested in the previous snippet of code because it's particular interesting.

@Geoff Norton：也许我永远不会使用你的解决方案，

@Geoff Norton: Maybe I'll never use your solution but I find it amazing anyway...

我的尝试是创建一个UINavigationViewController作为模板。特别是，UINavigationController最初有一个loginView（它可能是一种rootviewcontroller）。然后登录时，我可以有两种类型的视图：主视图和辅助视图。前者在登录视图的同一级别（他们可以是一种rootviewcontrollers）。后者被推到第一个之上。您可以浏览正常的UInavigationController堆栈或通过工具栏。工具栏只加载主视图。

My attempt is to create a sort of UINavigationViewController that acts as a template. In particular, the UINavigationController initially has a loginView (it could be a sort of rootviewcontroller). Then when logging in, I could have two type of views: main and secondary views. The former are at the same level of the login view (they could be a sort of rootviewcontrollers). The latter are pushed above the first ones. You can navigate through the normal UInavigationController stack or by means of a toolbar. The toolbar loads only main view.

是否可以使用UINavigationController执行此操作？

Is it possible to do this with a UINavigationController?

。

推荐答案

它可能，但你不应该这样做。根据苹果UINavigationController是不是为子类化。如果你坚持这样做：

Its possible but you shouldn't do it. According to Apple the UINavigationController is "not designed for subclassing". If you insist on doing this:

public YourNavController : UINavigationController {
    [Export ("initWithRootViewController:")]
    public YourNavController (UIViewController vc) {
      UIViewController fc = new UIViewController ();
      Handle = Messaging.intptr_objc_msgSend_intptr (this.Handle, Selector.GetHandle ("initWithRootViewController:"), fc.Handle);
      FakeRootViewController = fc;
      vc.NavigationItem.HidesBackButton = true;
      PushViewController (vc, false);
    }
}

接近的东西应该可以工作。

Something close to that should work.

这篇关于的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！