swift通过block传值

有值的DetailViewController中 定义闭包

//假如你想传个字符串
typealias MyColsure = (_ str: String) -> Void

某个事件触发方法

  func backBtnClick()  {
        if self.myColsure != nil {
            self.myColsure!("我是传回去的值")
        }
        _ = self.navigationController?.popViewController(animated: true)
    }
    

当前需要得到值的VC的某个事件触方法

    func sendBtnClick()  {
        let vc = DetailViewController()   
        //闭包传值
        vc.myColsure = {
            (backStr: String) -> Void in
            
            self.textField.text = backStr
            
        }
        
        self.navigationController?.pushViewController(vc, animated: true)
        
    }

坚持每天走一小步 勤能补拙 何况我这么有天赋 ~