如何将多个视图控制器推送到导航控制器上 [英] How to push multiple view controllers onto navigation controller

问题描述

新手在这里编写我的第一个应用程序(已经制作了几个教程应用程序).我使用名为RootViewController"的视图控制器作为导航控制器.我已使用以下命令成功地将另一个视图控制器推送到名为ClientListViewController"的顶部:

Newbie here programming my first app (having made several tutorial apps). I am using a view controller called 'RootViewController' as a navigation controller. I have successfully pushed another view controller on top of this called 'ClientListViewController' using the command:

[self.navigationController pushViewController:clientListViewController animated:YES];

我现在在 ClientListViewController 中并尝试将另一个视图控制器推送到名为AddClientViewController"的堆栈上.我想让它成为 UIModalPresentationFormSheet 形式的模态视图控制器.我正在尝试使用上述命令的变体来推送新的视图控制器，但我不知道如何替换自我".我试过了:

I am now in the ClientListViewController and trying to push another view controller onto the stack called 'AddClientViewController'. I would like to make this a modal view controller in the form of a UIModalPresentationFormSheet. I am trying to use a variation of the command above to push the new view controller but i don't know how to replace the 'self'. I have tried:

[RootViewController.navigationController pushViewController:AddClientViewController animated:YES];

还有……

[[RootViewController navigationController] pushViewController:AddClientViewController animated:YES];

以及这些组合中的每一个都使用小R"来表示词根.仍然没有运气.

as well as each of these combinations using small 'R's for the word Root. Still no luck.

为清楚起见，我在实现文件的顶部使用了以下代码.

For clarity, I have used the following code at the top of my implementation file.

#import "AddClientViewController.h"

我是否以正确的方式处理这个问题，还是应该使用全新的导航控制器将其添加到其中?

Am I approaching this in the right way, or should I be using a brand new navigation controller to add it to?

收到的任何指点.

非常感谢

推荐答案

每个 UIViewController 都有一个名为 navigationController 的属性.此属性指的是最近的封闭 UINavigationController，如果有的话.所以你可以在你的 ClientListViewController 中说 self.navigationController.

Every UIViewController has a property named navigationController. This property refers to the nearest enclosing UINavigationController, if there is one. So you can just say self.navigationController in your ClientListViewController.

在 iOS 中，我们通常将类名大写.所以听起来 AddClientViewController 是一个类名.您需要有一个该类的实例才能将它推送到导航控制器的堆栈上.像这样:

In iOS, we normally capitalize class names. So it sounds like AddClientViewController is a class name. You need to have an instance of that class to push it on the navigation controller's stack. Something like this:

AddClientViewController *addClientVC = [[AddClientViewController alloc] init];
[self.navigationController pushViewController:addClientViewController animated:YES];

在推送之前，您可能需要使用不同的 init 方法或设置 addClientVC 的某些属性；这取决于您对 AddClientViewController 的实现.

You might need to use a different init method or set some properties of addClientVC before pushing it; that depends on your implementation of AddClientViewController.

如果你想以模态的方式呈现它，你不要把它推送到导航控制器的堆栈上.相反，你这样做:

If you want to present it modally, you don't push it on the navigation controller's stack. Instead you do it this way:

AddClientViewController *addClientVC = [[AddClientViewController alloc] init];
addClientVC.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentViewController:addClientVC animated:YES completion:nil];

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