使用 on/off 开关摆脱不同 viewcontroller 中的 UILabel

Question

我想做的是对 UISwitch 使用 segue，这样我就可以在开关关闭时摆脱第一个视图控制器上名为 phaselabel 的 UILabel .

在第一个视图控制器上我有：

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
}

在第二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 = ""
        }
    }

我希望这不会太复杂。我在第二个视图控制器中使用了 var name: String = ""，所以我可以用它来获取第一个视图控制器中的 phaseLabel。

Answer 1

这是我要做的：-

我会在 class 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，我会将开关值存储到 isSwitchOn 变量，因为在将 viewController 转换为 [ 之后，您可以访问 class 变量=13=].

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 MeditationScreenViewController 中的 viewWillAppear 方法中使用该值来隐藏或不隐藏标签。

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你要接收的数据

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

//perform tasks with passed data

在其他ViewController

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 开关摆脱不同 viewcontroller 中的 UILabel

Using on/off switch to get rid of UILabel in different viewcontroller

uilabel

uiswitch

ios

segue

swift