我们如何将闭包传递给应用程序流中的任何ViewController?

本文介绍了我们如何将闭包传递给应用程序流中的任何ViewController?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

在View Controller A中，

In View Controller A,

var completionBlock: (((String) -> ()))? = nil

&我将完成块称为(ViewController A):

& I am calling the completion block like(ViewController A):

if let block = completionBlock { block("block data to pass") }

我不想将完成数据传递给ViewController B，相反，我想传递给从ViewController B呈现的ViewController C.

I don't want to pass the completion data to ViewController B, instead i want to pass to ViewController C which is presenting from ViewController B.

简单地说，我想将闭包数据从ViewController A传递到ViewController C.我知道如何通过委托传递数据，只是对闭包感到好奇?

In simple words, i want to pass the closure data to from ViewController A to ViewController C.I know how to pass data with delegates, just curious with closures?

我们如何实现?

推荐答案

这只是我为您快速编写的示例代码，您可以根据需要修改对象.希望能解决您的问题.

This is just a sample code i quickly wrote for you, you can modify objects based on your need. Hopefully will address your problem.

import UIKit class ViewControllerA: UIViewController { var block:(((String) -> ()))? = { input in print(input) } override func viewDidLoad() { super.viewDidLoad() self.title = "A" let VCB = ViewControllerB() let VCC = ViewControllerC() VCC.block = block VCB.VCC = VCC self.navigationController?.pushViewController(VCB, animated: true) } } class ViewControllerB: UIViewController { var VCC:ViewControllerC? override func viewDidLoad() { super.viewDidLoad() self.view.backgroundColor = .gray } override func viewDidAppear(_ animated: Bool) { super.viewDidAppear(animated) if let VCC = VCC { self.present(VCC, animated: true, completion: nil) } } } class ViewControllerC: UIViewController { var block:(((String) -> ()))? = nil override func viewDidLoad() { super.viewDidLoad() self.view.backgroundColor = .yellow //Will run the block that has been passed block?("test") } }