KentarouKanno/UIResponder + extension.md

## UIResponder + extension.md

      
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              UIResponder + extension.md
            
          
    UIResponder + extension

★ 現在のFirst responderを取得する
extension UIResponder {

    private weak static var _currentFirstResponder: UIResponder? = nil

    public class func currentFirstResponder() -> UIResponder? {
        UIResponder._currentFirstResponder = nil
        UIApplication.sharedApplication().sendAction(#selector(UIResponder.findFirstResponder(_:)), to: nil, from: nil, forEvent: nil)
        return UIResponder._currentFirstResponder
    }

    internal func findFirstResponder(sender: AnyObject) {
        UIResponder._currentFirstResponder = self
    }
}