使用 Swift 使用 Segue 发送数据 [英] Sending data with Segue with Swift

问题描述

我有两个视图控制器和两个视图.在我的第一个视图中，我将变量currentUser"设置为 false.我需要能够在第二个视图控制器中将currentUser"设置为 true.

I have two view controllers and two views. In my first view, I set the variable 'currentUser' to false. I need to be able to set 'currentUser' to true in the second view controller.

当尝试从第二个视图中引用currentUser"时，它不会选择它，因为currentUser"是在第一个视图控制器中定义的.

When trying to reference 'currentUser' from the second view it's not picking it up as 'currentUser' is defined in the first view controller.

如何使用 segue 传递变量?

How do I carry across variables with segue?

推荐答案

使用 segue 将 Any ViewController 的值设置为第二个

像这样:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

    if(segue.identifier == "yourIdentifierInStoryboard") {

        let yourNextViewController = (segue.destinationViewController as yourNextViewControllerClass)
        yourNextViewController.value = yourValue

在 yourNextViewController 类中.

And in your yourNextViewController class.

class yourNextViewControllerClass {

    var value:Int! // or whatever

您也可以以编程方式调用它:

You can call this also programmatically:

 self.performSegueWithIdentifier("yourIdentifierInStoryboard", sender: self)

将 DestinationViewController 中的值设置回主(第一个)ViewController

1. 实现一个协议，例如创建一个名为 protocol.swift 的文件.

1. Implement a protocol, for example create a file called protocol.swift.

    protocol changeUserValueDelegate {
       func changeUser(toValue:Bool)
    }

2.在第二个视图上设置代理

2. set the delegate on your second View

    class yourNextViewControllerClass {

    var delegate:changeUserValueDelegate?

3. 在加载时设置委托 (prepareForSegue)

3. set the delegate on load (prepareForSegue)

    if(segue.identifier == "yourIdentifierInStoryboard") {

        var yourNextViewController = (segue.destinationViewController as yourNextViewControllerClass)
        yourNextViewController.delegate = self

4. 给 FirstViewController 添加函数

4. add Function to FirstViewController

    func changeUser(toValue:Bool) {
        self.currentUserValue = toValue
    }

5. 从你的 SecondViewController 调用这个函数

5. call this function from your SecondViewController

     delegate?.changeUser(true)

6. 在 FirstViewController 中设置委托

6. Set the delegate in your FirstViewController

    class FirstViewController: UIViewController, ChangeUserValueDelegate {

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