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

Question

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

Answer 1

Swift 3

Any , if you know the sender is never nil .

@IBAction func buttonClicked(sender : Any) {
    println("Button was clicked", sender)
}

Any? , if the sender could be nil .

@IBAction func buttonClicked(sender : Any?) {
    println("Button was clicked", sender)
}

Swift 2

AnyObject , if you know the sender is never nil .

@IBAction func buttonClicked(sender : AnyObject) {
    println("Button was clicked", sender)
}

AnyObject? , if the sender could be nil .

@IBAction func buttonClicked(sender : AnyObject?) {
    println("Button was clicked", sender)
}

Answer 2

AnyObject

Other mapping type,

Remap certain Objective-C core types to their alternatives in Swift, like NSString to String

Remap certain Objective-C concepts to matching concepts in Swift, like pointers to optionals