Question

我没有找到包含segue的Swift Delegate模式的示例。我希望老板类（老板视图）向工人类（工人视图）发送订单并打印老板说打印的内容。代表即将到来＆＃39; nil＆＃39;当我按下boss页面上的任一按钮（doThisButton / doThatButton）时。

编辑：我的观看次数设置如下：＆＃39; TheBoss＆＃39; VC有三个按钮，＆＃39; doThisButton＆＃39;＆＃39; doThatButton＆＃39;和＆＃39; goToTheWorker＆＃39;按钮。＆＃39; TheWorker＆＃39; VC有一个文本框。＆＃39; doThisButton＆＃39; doThatButton＆＃39;将信息发送到＆＃39; TheWorker＆＃39;中的文本框VC，但不要让工作者＆＃39; VC出现了。＆＃39; goToTheWorker＆＃39;按钮是在故事板中设置的show segue，用于打开“工作人员”按钮。 VC

这是老板＆＃39;类

import UIKit

protocol TheBossesOrdersDelegate {
    func doThis(numberOne: Int, stringOne: String)
    func doThat(numberTwo: Int, stringTwo: String)
}

class TheBoss: UIViewController {

    // Declair Delegate
    var delegate: TheBossesOrdersDelegate!

    @IBAction func doThisButton(_ sender: UIButton) {
        delegate.doThis(numberOne: 75, stringOne: "Do This")
    }
    @IBAction func doThatButton(_ sender: UIButton) {
        delegate.doThat(numberTwo: 125, stringTwo: "Do That")
    }

    override func viewDidLoad() {
        super.viewDidLoad()
    }
}

这是＆＃39;工人＆＃39;类

import UIKit

class TheWorker: UIViewController, TheBossesOrdersDelegate {

    let theBoss = TheBoss()

    func doThis(numberOne: Int, stringOne: String) {
        print("the boss send this number to print: \(numberOne) and this string: \(stringOne)")
        theWorkersTextBox.text = "Number: \(numberOne) String:\(stringOne)"
    }

    func doThat(numberTwo: Int, stringTwo: String) {
        print("the boss send this number to print: \(numberTwo) and this string: \(stringTwo)")
        theWorkersTextBox.text = "Number: \(numberTwo) String:\(stringTwo)"
    }

    @IBOutlet weak var theWorkersTextBox: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()
        theBoss.delegate = self
    }
}

Answer 1

看起来你的代码让工人创建了老板。既然你这样做，你需要告诉老板他的代表是谁：

import UIKit

class TheWorker: UIViewController, TheBossesOrdersDelegate {


    let theBoss = { 
      let result = TheBoss()
      result.delegate = self  //This is the line you are missing
      return result
    }()

//The rest of your TheWorker class's code...
}

编辑：

根据你的评论，你有一个混乱的混乱。发布显示工作视图控制器的按钮的Boss类代码。你的标题是＆＃34; w / o segue＆＃34;，然后在你的评论中你说＆＃34;老板首先出现并包含一个通过show segue连接到工人的按钮＆＃34。什么？你说没有塞弗。

代表模式在Swift没有Segue

1 个答案:

编辑：