在ViewController和ContainerViewController之间传递数据

Question

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.

让我解释一下:

我可以通过协议更改Label Master(触摸容器按钮),但我无法更改标签容器(触摸主按钮).发生的事情是Master通过以下方式与容器连接.但是没有跟随Container链接到Master.

我试图添加但是segue,但它有效.

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
    }
}

有人能帮我吗？

Answer 1

您需要做的就是Container在主视图控制器中保留一个引用.

也就是说,您应该添加一个实例变量来Master保存对视图控制器的引用,而不仅仅是视图.您需要将其设置为prepareForSegue.

所以Master View Controller的开头看起来像这样:

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,只需使用刚添加的变量更改标签即可.

例:

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

这意味着你也可以摆脱你的MasterToContainer协议.

我测试了这段代码,所以我知道它有效,但不幸的是我是一个Objective-C开发人员,并且对Swift中的最佳实践一无所知.所以我不知道这是否是最佳方式,但它确实有效.

编辑:

这是我测试过的确切代码:

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:

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
    }
}

Answer 2

我用这个代码解决了它

从ViewController发送数据 - > ContainerViewController

Class ViewController : UIViewController {

func sendData(MyStringToSend : String) {

let CVC = childViewControllers.last as! ContainerViewController
CVC.ChangeLabel( MyStringToSend)
}

}

在您的ContainerViewController中

Class ContainerViewController : UIViewController {

@IBOutlet weak var myLabel: UILabel!

func ChangeLabel(labelToChange : String){

myLabel.text = labelToChange

 }
}

从ContainerViewController发送数据 - > ViewController

Class ContainerViewController : UIViewController {

func sendDataToVc(myString : String) {

   let Vc = parentViewController as! ViewController
   Vc.dataFromContainer(myString)
 }

}

并在ViewController中

  Class ViewController : UIViewController {

  func dataFromContainer(containerData : String){

   print(containerData)
  }

  }

我希望这会对某人有所帮助.