What is Objective-C ID in swift- What is the equivalent of an Objective-C id in Swift?

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problem ：

I'm trying to use an @IBAction to tie up a button click event to a Swift method. I'm trying to use @IBAction Bind button click events to Swift Method .In Objective-C the parameter type of the IBAction is id. stay Objective-C in ,IBAction The parameter type of is id.What is the equivalent of id in Swift? What is? Swift Medium id equivalent ？

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Solution ：

Reference resources ： https://stackoom.com/en/question/1ciyM