ios - 链接两个 UISegmentedControl

Question

我目前正在尝试连接两个 UISegmentedControl，其中第一个 Viewcontroller 连接到第二个。点击第二个 UISegment 将更新第一个 UISegment 的值。

View Controller :

class ViewController: UIViewController {
    @IBOutlet weak var tipLabel: UILabel!
    @IBOutlet weak var totalLabel: UILabel!
    @IBOutlet weak var billField: UITextField!
    @IBOutlet weak var tipController: UISegmentedControl!
    @IBOutlet weak var splitController: UISegmentedControl!
    @IBOutlet weak var splitLabel: UILabel!
    let defaults = UserDefaults.standard

    override func viewDidLoad() {

        super.viewDidLoad()
       defaults.synchronize()
        billField.becomeFirstResponder()
       tipController.selectedSegmentIndex = defaults.integer(forKey: "default_tip_index")
        print(tipController.selectedSegmentIndex)
        // Do any additional setup after loading the view, typically from a nib.

    }


    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


//    @IBAction func toSettings(_ sender: Any) {
//        self.performSegue(withIdentifier: "toSettings", sender: self)
//    }

    @IBAction func onTap(_ sender: Any) {
        view.endEditing(true)
    }
    @IBAction func calculateTip(_ sender: Any) {

        let tipPercentages = [0.18, 0.20, 0.25]
        let splitNumbers = [1,2,3,4]
        let bill = Double(billField.text!) ?? 0
        let tip = bill * tipPercentages[tipController.selectedSegmentIndex]
        let total = bill + tip

        tipLabel.text = String(format: "$%.2f", tip)
        totalLabel.text = String(format: "$%.2f", total)
        splitLabel.text = String(format: "$%.2f", total/Double((splitNumbers[splitController.selectedSegmentIndex])))

}

设置 View Controller :

class SettingsViewController: UIViewController {
     var tipPercentageIndex:Int!
    @IBOutlet weak var settingsTipController: UISegmentedControl!
    let defaults = UserDefaults.standard

    override func viewDidLoad() {
        super.viewDidLoad()
        settingsTipController.selectedSegmentIndex = defaults.integer(forKey: "default_tip_index")

        // Do any additional setup after loading the view.
    }


    @IBAction func Index(_ sender: Any) {
      tipPercentageIndex = settingsTipController.selectedSegmentIndex
    }


    @IBAction func saveButton(_ sender: Any) {
        tipPercentageIndex = settingsTipController.selectedSegmentIndex
        defaults.set(tipPercentageIndex, forKey: "default_tip_index")
        defaults.synchronize()
        self.performSegue(withIdentifier: "Tippy", sender: self)
    }

    @IBAction func Back(_ sender: Any) {
       self.performSegue(withIdentifier: "Tippy2", sender: self)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

但是，当从第二个切换回第一个时，我的解决方案不会更新该值，也不会存储该值。

注意:第一个接着第二个。

Answer 1

为分段控件的Value Changed添加IBAction，并更新受影响控件的值:

func updateSegments(){

    if let value = UserDefaults.standard.value(forKey: "key"){
        let selectedIndex = value as! Int
        yourSegmentedControl.selectedSegmentIndex = selectedIndex
    } else {
        yourSegmentedControl.selectedSegmentIndex = 0 // set to default
    }

    if let value = UserDefaults.standard.value(forKey: "anotherkey"){
        let selectedIndex = value as! Int
        anotherSegmentedControl.selectedSegmentIndex = selectedIndex
    } else {
        anotherSegmentedControl.selectedSegmentIndex = 0 // set to default
    }

   //etc...

}


@IBAction func yourSegmentedControlSelected(_ sender: UISegmentedControl) {
    UserDefaults.standard.set(sender.selectedSegmentIndex, forKey: "key")
    self.updateSegments()
}

@IBAction func anotherSegmentedControlSelected(_ sender: UISegmentedControl) {
    UserDefaults.standard.set(sender.selectedSegmentIndex, forKey: "anotherkey")
    self.updateSegments()
}