从UIView的子视图获取UINavController？ [英] Get UINavController from subview of UIView?

问题描述

我添加了一个自定义子视图到UIViewController的内容视图。从该子视图，我如何获得对superview的控制器的引用？
感谢

I added a custom subview to a UIViewController's content view. From that subview, how can I get a reference to the superview's controller? Thanks

推荐答案

正确的答案是你在做错了; - ）

The correct answer is "You're Doing It Wrong™" ;-)

你不需要从一个视图引用一个视图控制器，你绝对不应该在你的视图中保留一个视图控制器 - 或者你会得到一个保留循环和泄漏内存。

You shouldn't need to reference to a view controller from a view, and you certainly should never retain a view controller in one of your views -- or you'll end up with a retain loop and leak memory.

Cocoa提供多种模式来解决这个问题：

Cocoa provides multiple patterns to solve this problem:

• 使用委托：定义一个名为DemoViewDelegate的协议，并向DemoView添加一个委托属性。然后让你的视图控制器实现这个协议。 重要提示：代表不应保留！您创建的任何委托属性应设置为 assign 。请参阅苹果授权文档或只是google授权模式。

• Use a delegate: Define a protocol called DemoViewDelegate and add a delegate property to DemoView. Then have your view controller implement this protocol. Important: delegates should never be retained! Any delegate property you create should be set to assign. See Apple's Delegation docs or just google "delegation pattern".

使用响应者链：调用UIApplication的 sendAction：to：from：forEvent：，并将改为：到 nil 将您的操作消息自动路由到响应者链到您的视图控制器。请参见 Apple的响应程序文档以及更详细的操作邮件文档。

Use the responder chain: Call UIApplication's sendAction:to:from:forEvent: and leave to: set to nil to have your action message automatically routed up the responder chain to your view controller. See Apple's Responder docs and the more detailed Action Messages docs.

使用通知：在此特定情况下较不常见，但您也可以让视图控制器监听视图发送的通知。

Use a notification: Less common in this particular scenario, but you could also have your view controller listen for a notification, which the view sends.

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