Swift 闭包传值 反向传值

RT

A界面 接收B界面返回的时候的值

A界面

        let vc = CZHourPicker()

        

        vc.backClosure = {(backStr: String) -> Void in

            self.durationBtn.setTitle(backStr, for: UIControlState.normal)

            self.durationBtnT.setTitle(backStr, for: UIControlState.normal)

        }

        

        self.present(vc, animated: true, completion: nil)

B界面

//定义闭包类型（特定的函数类型函数类型）

typealias InputClosureType = (String) -> Void

  //接收上个页面传过来的闭包块

    var backClosure: InputClosureType?

       self.backClosure!(resultStr)

       self.dismiss(animated: true, completion: nil)