在View中找到ViewController

extension UIView{

   //返回该view所在VC

    func first ViewController() ->UIViewController? {

        for view in sequence(first:self.superview, next: { $0?.superview}) {

        if let responder = view?.next{

           if responder.isKind(of:UIViewController.self){

                      returnresponderas?UIViewController

                 }

           }

         }    

             returnnil

     }

  }