iOS中控制器之间的通信 [英] Communication between Controllers in iOS

问题描述

我上周正在学习使用Obejctive-C进行iOS开发，但我不知道如何在控制器之间进行通信. 这是我的故事板:

I am learning iOS development using Obejctive-C for the last week now and I can't figure out how to communicate between controllers. This is my storyboard:

Routes Page View Controller是嵌入在容器视图内的PageViewController.

The Routes Page View Controller is a PageViewController embedded inside the container view.

在MapViewController中，我想访问RoutesPageViewController来调用某些方法. 但是，当我在MapViewController中对容器视图进行出口并将其转换为RoutesPageViewController并调用方法时，它将引发此错误:

In the MapViewController I want to access the RoutesPageViewController to call some methods. But when I make an outlet to the container view in my MapViewController and cast it to RoutesPageViewController and call a method it throws this error:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIView items]: unrecognized selector sent to instance 0x7ff60551a300'

这是逻辑，因为它不是RoutesPageViewController.

Which is logic because it's not a RoutesPageViewController.

所以我的问题是，因为我在以后的iOS开发生涯中会遇到此问题:在Controller之间进行通信的好方法是什么?

So my question is since I will encounter this issue in my further iOS development career: What are the good ways to communicate between Controllers?

谢谢.

推荐答案

ContainerView只是一个UIView.它没有嵌入式ViewController的任何引用.它在视图控制器之间创建父子关系.像这里一样，MapViewController是父母，RoutesPageViewController是孩子.

ContainerView is just a UIView. It doesn't have any reference of embedded ViewController. It creates a Parent-Child relationship between viewcontrollers. Like here, MapViewController is a parent and RoutesPageViewController is a child.

现在，为了获取孩子的引用，您应该使用ViewController的childViewControllers属性.它将返回一个子ViewControllers数组.

Now, for getting reference of child you should use childViewControllers property of ViewController. It will return an array of child ViewControllers.

就像MapViewController

let routeVC : RoutesPageViewController? = self.childViewControllers.filter{$0 is RoutesPageViewController}.first

将为您提供RoutesPageViewController的参考.

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