从 Storyboard 向下转换/向上转换视图控制器 [英] Downcast/Upcast a View Controller From Storyboard

问题描述

如果我有一个包含名为ABCViewController"的视图控制器的故事板

If I have a storyboard that contains a view controller named "ABCViewController"

A_ViewController"是ABCViewController"的子类

"A_ViewController" is a subclass of "ABCViewController"

有没有办法从情节提要中将视图控制器ABCViewController"初始化为A_ViewController"?

is there a way to initiate the view controller "ABCViewController" from the storyboard as "A_ViewController" ?

推荐答案

你不能用故事板来做到这一点.instantiateViewControllerWithIdentifier 将返回 ABCViewController 的实例，您可以将其转换为超类(即UIViewController)但转换为子类(A_ViewController)>) 不起作用.您可以阅读为什么不能这样做 这里.

You can't do this with storyboard. instantiateViewControllerWithIdentifier will return instance of ABCViewController, you can cast it to superclass (i.e.UIViewController) but casting to subclass (A_ViewController) won't work. You can read why you can't do this here.

如果你想拥有两个布局相同但类不同的视图控制器，你应该使用 xib

If you want to have two view controllers with same layout, but different classes you should use xib

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