Question

我尝试做的是为UISwitch使用segue，这样当开关关闭时，我可以摆脱第一个视图控制器上UILabel phaselabel import UIKit class MeditationScreenViewController: UIViewController { @IBOutlet var phaseLabel: UILabel! func settingsDidChange(_ settings: MeditationSettings) { meditationSettings = settings session = MeditationSession(settings: settings, phaseChangedBlock: { [weak self] (phaseName) in debugPrint("Entering phase: \(phaseName)") guard let strongSelf = self else { return } strongSelf.phaseLabel.text = phaseName switch phaseName { case "Breathe In": strongSelf.circleAnimation.animate(direction: CircleAnimationView.Direction.expand, time: TimeInterval(strongSelf.meditationSettings.breathIn)) case "Breathe Out": strongSelf.circleAnimation.animate(direction: CircleAnimationView.Direction.contract, time: TimeInterval(strongSelf.meditationSettings.breathOut)) default: break } }, timeChangedBlock: { [weak self] phaseTime, phaseTotal in self?.timeLabel.text = "\(Int(phaseTime)) / \(Int(phaseTotal))" }, completion: { [weak self] in debugPrint("Finished") self?.timeLabel.text = "" self?.phaseLabel.text = "" self?.startStopButton.isSelected = false }) } override func viewWillAppear(_ animated: Bool) { self.phaseLabel.text = name } 。

在第一个视图控制器上，我有：

import UIKit

var name: String = ""

class MeditationSettingsViewController: UIViewController {

    @IBOutlet var showCycleTitleLabel: UILabel!
    @IBOutlet var showCycleTitleSwitch: UISwitch!

    @IBAction func showCycleTitleChanged(_ sender: UISwitch) {
        if (sender.isOn == true)
        {
            func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
                if segue.identifier == "segue" {
                    if let sendToDetailViewController = segue.destination as? MeditationScreenViewController {
                        name =
        }
        else
        {
            name = ""
        }
    }

在第二个视图控制器上我有：

var name: String = ""

我希望这不是太复杂。我在第二个视图控制器中使用了phaseLabel，因此我可以使用它来抓取第一个视图控制器中的HTML: <button> <span id="firstspan">Hi</span> <span id="secondspan">Hello World!!</span> </button> CSS: span { white-space: nowrap; } button { overflow: hidden; width:35px; transition: width 2s; } JQuery: $(function() { $("#secondspan").hide(); $("button").one("click", function() { $("button").css("width", "90px"); $("#firstspan").toggle(); $("#secondspan").toggle(); }); });。

Answer 1

以下是我要做的事： -

我会在类MeditationScreenViewController中定义一个变量，它将存储开关的值，无论它是打开还是关闭。

class MeditationScreenViewController: UIViewController {

      var isSwitchOn: Bool!
}

并且在调用prepareForSegue时，我将切换值存储到isSwitchOn变量，因为在将viewController转换为MeditationScreenViewController之后，您可以访问类变量。

代码看起来像这样： -

 @IBAction func showCycleTitleChanged(_ sender: UISwitch) {
        if (sender.isOn == true)
        {
            func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
            if segue.identifier == "segue" {
                if let sendToDetailViewController = segue.destination as? MeditationScreenViewController {
                    sendToDetailViewController.isSwitchOn = sender.isOn

     }
}
  }
}

最后，在viewWillAppear中的MeditationScreenViewController方法中，使用该值隐藏标签。

override func viewWillAppear(_ animated: Bool) {
if isSwitchOn == true {
    //unhide the label
   self.phaseLabel.isHidden = false
   //set your label value here
  }
    else {
     self.phaseLabel.isHidden = true
   }
}

Answer 2

在ViewController中，您希望接收数据

//create variable to store passed data from UISwitch
var switchStatePassed = [String]()

//perform tasks with passed data

在另一个ViewController中

fun prepare(for segue: UIStorybordSegue, sender: Any?) {
  //set destination to MeditationScreenViewController
  if let destination = segue.destination as? 
  MeditationScreenViewController {
   //check UISwitch state and create variable to store info
   if showCycleTitleSwitch.on {
    let switchState = "enabled"
   } else {
      let switchState = "disabled"
    }
   //send switchState to other ViewController
   destination.switchStatePassed = switchState
}

使用on / off开关去掉不同viewcontroller中的UILabel

2 个答案: