在Swift中创建UIView的副本 [英] Create a copy of a UIView in Swift

问题描述

因为对象是引用类型，而不是值类型，如果将 UIView 设置为等于另一个 UIView ，视图是同一个对象。如果你修改一个，你也会修改另一个。

Because objects are reference types, not value types, if you set a UIView equal to another UIView, the views are the same object. If you modify one you'll modifying the other as well.

我有一个有趣的情况，我想添加一个 UIView 作为另一个视图中的子视图，然后我做了一些修改，这些修改不应该影响原来的 UIView 。如何制作 UIView 的副本，以便我可以确保将该副本添加为子视图而不是对原始 UIView ？

I have an interesting situation where I would like to add a UIView as a subview in another view, then I make some modifications, and those modifications should not affect the original UIView. How can I make a copy of the UIView so I can ensure I add that copy as a subview instead of a reference to the original UIView?

请注意，我无法像创建原始文件一样重新创建视图，我需要一些方法来创建一个给定任何 UIView的副本 object。

Note that I can't recreate the view in the same way the original was created, I need some way to create a copy given any UIView object.

推荐答案

您不能随意复制对象。只能复制实现 NSCopying 协议的对象。

You can't arbitrarily copy an object. Only objects that implement the NSCopying protocol can be copied.

但是，有一种解决方法：自<$​​ c $ c> UIView s可以序列化为磁盘（例如从XIB加载），你可以使用 NSKeyedArchiver 和 NSKeyedUnarchiver 创建一个描述您的视图的序列化 NSData ，然后再次反序列化以获得一个独立但相同的对象。

However, there is a workaround: Since UIViews can be serialized to disk (e.g. to load from a XIB), you could use NSKeyedArchiver and NSKeyedUnarchiver to create a serialized NSData describing your view, then de-serialize that again to get an independent but identical object.

这篇关于在Swift中创建UIView的副本的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！