问题描述
我想以编程方式启用和禁用macOS中NSToolBar的工具栏项目(按钮).我试图为ViewController控件拖动创建一个出口，但是Xcode不接受该放置.我该怎么办?
I would like to enable and disable programmatically a toolbar item (a button) of a NSToolBar in macOS. I tried to create an outlet to ViewController control-dragging but Xcode don't accept the drop. How can I do this?
我阅读了此问题关于带有Objective-C答案的类似问题，但我我是个初学者，不太了解如何在Swift中执行此操作.
I read this question about a similar question with Objective-C answers but I'm a beginner and can't understand well how to do this in Swift.
推荐答案
实现委托方法
override func validateToolbarItem(_ item: NSToolbarItem) -> Bool
例如，您可以通过itemIdentifier区分项目，并返回true启用和false禁用该项目
You can distinguish the items for example by the itemIdentifier and return true to enable and false to disable the item
文档提供了一个示例.
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