Swift 闭包反向传值

Swift中闭包反向传值

1.第二控制器申明一个闭包类型

typealias BackBlock = (String) -> Void

2.第二控制器定义一个变量

var BackBlockClousure : BackBlock?

3.第一控制器实现回调

let VC = segue.destination as! DetailsViewController
VC.BackBlockClousure = {
     (backStr:String) -> Void in
      NSLog(backStr, "")
}

4.第二控制器传值

self.BackBlockClousure!("反向传值" + area.name)