问题
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?
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.
回答1:
Implement the delegate method
override func validateToolbarItem(_ item: NSToolbarItem) -> Bool
You can distinguish the items for example by the itemIdentifier and return true to enable and false to disable the item
The documentation provides an example.
来源：https://stackoverflow.com/questions/44577092/how-to-disable-a-button-of-a-nstoolbar-of-macos-x-in-swift