复制NSView in cocoa / objective-c [英] Copy NSView in cocoa / objective-c

问题描述

我看不到任何方式复制NSView并创建一个相同的NSView对象。我看到关于使用NSData的google命中，但我不明白。

I can't see any way to copy an NSView and create an identical NSView object. I see google hits about "use an NSData" but I don't understand that.

推荐答案

NSView，该视图必须实现 NSCopying 协议。不幸的是，NSView没有。

To straight up "copy" an NSView, the view has to implement the NSCopying protocol. Unfortunately, NSView does not.

幸运的是， 实现了 NSCoding 这意味着我们仍然可以复制一个视图：

Fortunately, it does implement the NSCoding protocol, which means we can still duplicate a view like:

NSData * archivedView = [NSKeyedArchiver archivedDataWithRootObject:myView];
NSView * myViewCopy = [NSKeyedUnarchiver unarchiveObjectWithData:archivedView];

和voilá！您现在有 myView 的重复。

And voilá! You now have a duplicate of myView.

编辑： Swift版本）

(Swift version)

let archivedView = NSKeyedArchiver.archivedData(withRootObject: myView)
let myViewCopy = NSKeyedUnarchiver.unarchiveObject(with: archivedView)

（ archivedView Data ，不是 NSData ）

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