在ViewController和ContainerViewController之间传递数据 [英] Pass data between ViewController and ContainerViewController

问题描述

我正在开发一个应用程序，需要在view和containerView之间传递数据.我需要从两个视图发送数据和接收数据.

I'm working on an app, and need to pass data between view and containerView. I need to send data and receive data from both Views.

让我更好地解释一下:

我可以通过协议更改标签主控(触摸容器按钮)，但是我不能更改标签容器(触摸主按钮).发生的情况是主服务器通过以下方式与容器连接.但是没有跟随Container链接到Master.

I can change the Label Master (Touch the Container Button) by protocol, but I can not change the Label Container (Touch the Master button). What happens is the Master connects with the container by a following. But do not have a follow Container linking to the Master.

我尝试添加但选择添加，但是有效.

I tried to add but segue to, but it worked.

主视图控制器:

import UIKit

protocol MasterToContainer {
    func changeLabel(text:String)
}

class Master: UIViewController, ContainerToMaster {

    @IBOutlet var containerView: UIView!

    var masterToContainer:MasterToContainer?

    @IBOutlet var labelMaster: UILabel!


    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if segue.identifier == "containerViewSegue" {
            let view = segue.destinationViewController as? Container
            view!.containerToMaster = self
        }
    }

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

    @IBAction func button_Container(sender: AnyObject) {
        masterToContainer?.changeLabel("Nice! It's work!")
    }


    func changeLabel(text: String) {
        labelMaster.text = text
    }
}

容器视图控制器:

import UIKit

protocol ContainerToMaster {
    func changeLabel(text:String)
}

class Container: UIViewController, MasterToContainer {

    var containerToMaster:ContainerToMaster?

    @IBOutlet var labelContainer: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()

    }

    @IBAction func button_Master(sender: AnyObject) {
        containerToMaster?.changeLabel("Amazing! It's work!")
    }


    func changeLabel(text: String) {
        labelContainer.text = text
    }
}

有人可以帮助我吗?

推荐答案

您需要做的就是在主视图控制器中保留对Container的引用.

All you need to do is keep a reference to Container in your master view controller.

也就是说，您应该在Master中添加一个实例变量，该变量将包含对视图控制器的引用，而不仅仅是对视图的引用.您需要在prepareForSegue中进行设置.

That is, you should add an instance variable to Master that will hold a reference to the view controller, not just the view. You'll need to set it in prepareForSegue.

因此，Master View Controller的开始看起来像这样:

So the beginning of Master View Controller would look something like this:

class Master: UIViewController, ContainerToMaster {

@IBOutlet var containerView: UIView!

var containerViewController: Container?

@IBOutlet var labelMaster: UILabel!

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "containerViewSegue" {
        containerViewController = segue.destinationViewController as? Container
        containerViewController!.containerToMaster = self
    }
}

然后在按钮功能中，只需使用刚刚添加的变量更改标签即可.

And then in your button function, simply change the label using the variable you just added.

示例:

@IBAction func button_Container(sender: AnyObject) {
    containerViewController?.changeLabel("Nice! It's work!")
}

这意味着您也可以摆脱MasterToContainer协议.

This means you can get rid of your MasterToContainer protocol too.

我测试了这段代码，所以我知道它可以工作，但是不幸的是我是一个Objective-C开发人员，对Swift的最佳实践一无所知.因此，我不知道这是否是最好的解决方法，但它确实有效.

I tested this code, so I know it works, but unfortunately I am an Objective-C dev, and know nothing about best practices in Swift. So I don't know if this is the best way to go about it, but it certainly works.

这是我测试过的确切代码:

Here's the exact code I've tested:

Master.swift:

Master.swift:

import UIKit

class Master: UIViewController, ContainerToMaster {

    @IBOutlet var containerView: UIView!
    @IBOutlet var labelMaster: UILabel!
    var containerViewController: Container?

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if segue.identifier == "containerViewSegue" {
            containerViewController = segue.destinationViewController as? Container
            containerViewController!.containerToMaster = self
        }
    }

    @IBAction func button_Container(sender: AnyObject) {
        containerViewController?.changeLabel("Nice! It's work!")
    }

    func changeLabel(text: String) {
        labelMaster.text = text
    }
}

Container.swift:

Container.swift:

import UIKit

protocol ContainerToMaster {
    func changeLabel(text:String)
}

class Container: UIViewController {

    @IBOutlet var labelContainer: UILabel!
    var containerToMaster:ContainerToMaster?

    @IBAction func button_Master(sender: AnyObject) {
        containerToMaster?.changeLabel("Amazing! It's work!")
    }

    func changeLabel(text: String) {
        labelContainer.text = text
    }
}

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