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?
asked Jun 3, 2014 at 1:14
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2 Answers
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)
}
answered Jun 3, 2014 at 1:14
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11Or sometimes
AnyObject?, depending on how you want to handle nil. Commented Jun 3, 2014 at 2:22 -
From docs:Swift includes a protocol type named AnyObject that represents any kind of object, just as id does in Objective-C. developer.apple.com/library/prerelease/ios/documentation/Swift/… Commented Jun 3, 2014 at 16:51
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1Or if you are sure it is the button just UIButton instead of anyObject– BinarianCommented Jun 16, 2014 at 8:20
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AnyObject? if you think that nil might be called (quite often people call IBAction functions from code, without a sender), MyClass or MyClass? if you know that the sender is of no other class than MyClass. Commented Sep 25, 2015 at 15:05
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1As of Swift 3, Objective-C interfaces that use
idand untyped collections will be imported into Swift as taking theAnytype instead ofAnyObject. SE-0116 Commented Feb 15, 2017 at 20:40
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
answered Jul 27, 2015 at 9:10
