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，如果你设置一个 UIView 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，我想在另一个视图中添加一个 UIView 作为子视图，然后我进行了一些修改，这些修改不应该影响原来的 UIView代码>.如何制作 UIView 的副本，以便确保将该副本添加为子视图而不是对原始 UIView 的引用?

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，我无法以与创建原始视图相同的方式重新创建视图，我需要某种方式来创建给定任何 UIView 对象的副本.

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

你不能随意复制一个对象.只能复制实现了 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，有一个解决方法:由于 UIView 可以序列化到磁盘(例如从 XIB 加载)，您可以使用 NSKeyedArchiver 和 NSKeyedUnarchiver 创建一个序列化的 NSData 来描述你的视图，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.

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