Question

我一直在寻找我的答案，但一切似乎都有点令人困惑，所以我决定尝试提出以下问题：

我在第一个视图中有三个按钮。

红色，蓝色和白色。

在第一个视图中也有一个隐藏的标签，它会根据点击的按钮而变化（单击按钮时会显示“选择红/蓝/白色按钮”）。

此外，当触摸一个按钮时，会出现一个带有文本“下一个屏幕”的新按钮，将一个segue推送到标题中带有标签的另一个视图。

问题是：如何根据我们在第一个VC中点击的按钮在新视图中设置标题？

我的意思是，如果我们点击了红色，那就是：“我们点击了红色按钮”。等

代码：

@IBOutlet weak var labelTipo: UILabel!
@IBOutlet weak var siguiente: UIButton!

var redSel = String()
var BlueSel = String()
var whiteSel = String()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    siguiente.hidden = true

    redSel = labelTipo.text!
    BlueSel = labelTipo.text!
    whiteSel = labelTipo.text!
}

@IBAction func redButton(sender: AnyObject) {
    siguiente.hidden = false

    labelTipo.text = "Has elegido un regalo de cumpleaños"
}

@IBAction func blueButton(sender: AnyObject) {
     siguiente.hidden = false

    labelTipo.text = "Has elegido un regalo de aniversario"
}

@IBAction func whiteButton(sender: AnyObject) {
     siguiente.hidden = false

    labelTipo.text = "Has elegido un regalo casual"
}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if(segue.identifier == "detailViewController") {
        print("Colour is")

        let vc = segue.destinationViewController as! detailViewController

        vc.blueSel = BlueSel
        vc.redSel = redSel
        vc.whiteSel = whiteSel
    }
}
}

class ViewController: UIViewController {

var redSel = String()
var blueSel = String()
var whiteSel = String()

@IBOutlet weak var titleLabel: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.

    titleLabel.text = ""
}

Answer 1

这很简单，请在单击按钮时创建一个局部变量来分配字符串。并将此变量传递给另一个viewController，您将其推送到。在您的情况下，将“labelTipo.text”的值赋给新变量并将其传递给另一个viewController。

// Your SourceViewController

@IBOutlet weak var labelTipo: UILabel!
@IBOutlet weak var siguiente: UIButton!

    var passThisValue = String()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    siguiente.hidden = true

}

@IBAction func redButton(sender: AnyObject) {
    siguiente.hidden = false

    labelTipo.text = "Has elegido un regalo de cumpleaños"
    self.passThisValue = labelTipo.text 

}

@IBAction func blueButton(sender: AnyObject) {
     siguiente.hidden = false

    labelTipo.text = "Has elegido un regalo de aniversario"
    self.passThisValue = labelTipo.text 

}

@IBAction func whiteButton(sender: AnyObject) {
     siguiente.hidden = false

    labelTipo.text = "Has elegido un regalo casual"

    self.passThisValue = labelTipo.text 
}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if(segue.identifier == "AnotherViewController") {

        let vc = segue.destinationViewController as! AnotherViewController

        vc.valueFromSourceViewController = self.passThisValue
    }
}
}

// Your AnotherViewController 

class AnotherViewController: UIViewController {

var valueFromSourceViewController = String()

@IBOutlet weak var titleLabel: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()

    titleLabel.text = self.valueFromSourceViewController
}

Answer 2

尝试在prepareForSegue方法中添加一些内容，但将labelTipo变量作为类的属性：

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if(segue.identifier == "detailViewController") {
            print("Colour is")

            let vc = segue.destinationViewController as! detailViewController

            vc.blueSel = BlueSel
            vc.redSel = redSel
            vc.whiteSel = whiteSel
//make some newLocalVariable property in vc! 
            vc.newLocalVariable = self.labelTipo.text
        }
    }

所以实际上你保存了你的“vc”新值的局部变量“newLocalVariable”，它等于labelTipo.text或者你想要的任何东西。

Answer 3

尽管如此，你可以更简洁地做到这一点。这是一个完整的示例，您可以从https://bitbucket.org/abizern/so-32935054/get/1ec75832723d.zip

下载

如果为选择类型设置枚举，则可以在设置值时配置UI。

这是完整的主视图控制器

import UIKit

class ViewController: UIViewController {

    enum Selection: String {
        case NoSelection = ""
        case RedButton = "Has elegido un regalo de cumpleaños"
        case BlueButton = "Has elegido un regalo de aniversario"
        case WhiteButton = "Has elegido un regalo casual"
    }

    @IBOutlet var colorLabel: UILabel!
    @IBOutlet var nextButton: UIButton!

    var selection: Selection = .NoSelection {
        didSet {
            colorLabel.text = selection.rawValue
            if selection == .NoSelection {
                nextButton.hidden = true
            } else {
                nextButton.hidden = false
            }
        }
    }


    override func viewDidLoad() {
        super.viewDidLoad()
        colorLabel.text = selection.rawValue
        nextButton.hidden = true
    }

    @IBAction func onRed(sender: UIButton) {
        selection = .RedButton
    }

    @IBAction func onBlue(sender: UIButton) {
        selection = .BlueButton
    }

    @IBAction func onWhite(sender: UIButton) {
        selection = .WhiteButton
    }


    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        guard
            segue.identifier == "ShowDetail",
            let destinationVC = segue.destinationViewController as? DetailViewController
            else { return }

        destinationVC.displayText = selection.rawValue
    }
}

在segue中，您将字符串传递给目标视图控制器：

import UIKit

class DetailViewController: UIViewController {

    @IBOutlet var label: UILabel!

    var displayText: String = ""


    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        label.text = displayText
    }

}

这是更少的代码和更优雅的恕我直言。通过设置选择来配置UI，您不必在每个功能中手动设置按钮的hidden变量。

如何根据我们点击的按钮设置标题。发送数据

3 个答案: