Have a look at this example code:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let letterButton = UIButton.buttonWithType(.Custom) as UIButton
self.view.addSubview(letterButton)
letterButton.addTarget(self, action:Selector("buttonDidTap:"), forControlEvents: .TouchUpInside)
}
func buttonDidTap(button: UIButton!) {
print(button.char)
}
}
The target action for the UIButton
works fine as long as Selector is public or internal, but if it's private, it crashes due to unrecognized selector sent to instance
Is there any way I can achieve this ? I don't want to make tap function public or internal.
you need @objc
to expose a private method to objc runtime
@objc private func buttonDidTap(button:UIButton!) {
println(button.char)
}
From Xcode6 beta4 release notes
Declarations marked private are not exposed to the Objective-C runtime if not otherwise annotated. IB outlets, IB actions, and Core Data managed properties remain exposed to Objective-C whatever their access level. If you need a private method or property to be callable from Objective-C (such as for an older API that uses a selector-based callback), add the @objc attribute to the declaration explicitly.! !
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