从容器视图访问主视图控制器 [英] Access the main view controller from its container view

问题描述

我有一个带有容器视图的mainViewController。我正在尝试从容器视图访问theMainViewController。



这是我的代码：

I have a mainViewController with a container view in it. I'm trying to access theMainViewController from the container view.

Here is my code:

self.theMainViewController = (theMainViewController *)self.parentViewController;

NSIndexPath *indexPath = [NSIndexPath indexPathForRow:idx inSection:0];
[self.theMainViewController .tableView selectRowAtIndexPath:indexPath animated:YES scrollPosition:UITableViewScrollPositionBottom];

这不起作用。 self.theMainViewController在我制作nslog时给出一个nil值。然后我换了：

This doesn't work. self.theMainViewController gives a nil value when I make an nslog of it. I then replaced:

self.parentViewController

to：

to:

self presentingViewController

它给了我相同的结果。如何从容器视图的类中访问mainViewController？

and it gave me the same results. How can I access the mainViewController from the container view's class?

推荐答案

它显示了类设计中的一些弱点。您应该坚持使用MVC范例，该范例包括数据，UI和事件处理的分离。



您需要为它定义和设置（弱）属性。我建议创建一个协议和一个委托。

It shows some weakness in your class design. You should stick to the MVC paradigma which inlcudes the separation of data, UI and handling to events.

You need to define and set a (weak) property for it. I would recommend to create a protocol and a delegate.

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