Alternative to performSelector in Swift?

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Using closures

class A {
    var selectorClosure: (() -> Void)?

    func invoke() {
        self.selectorClosure?()
    }
}

var a = A()
a.selectorClosure = { println("Selector called") }
a.invoke()

Note that this is nothing new, even in Obj-C the new APIs prefer using blocks over performSelector (compare UIAlertView which uses respondsToSelector: and performSelector: to call delegate methods, with the new UIAlertController).

Using performSelector: is always unsafe and doesn’t play well with ARC (hence the ARC warnings for performSelector:).

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