Question

我在同步两个UISegments的值时遇到了问题。假设第一个UISegment根据第二个UISegment（位于不同的ViewController中）的值进行更新，然后根据第二个ViewController中选择的内容更新其自己的段中的值。但是，值不会传输到第一个UISegment，这意味着即使我使用默认值和存储键，也不会存储标题和值。

的ViewController

import UIKit

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()

        billField.text = String(defaults.double(forKey: "bill_value"))

        print(tipController.selectedSegmentIndex)

        if billField.text == "" || (billField.text == nil) {
            billField.placeholder = String(0.00)
        }

        billField.becomeFirstResponder()

        tipController.selectedSegmentIndex = defaults.integer(forKey: "default_tip_index")
    }

    override func viewWillAppear(_ animated: Bool) {
        tipController.selectedSegmentIndex = defaults.integer(forKey: "default_tip_index")
    }

    @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 //converts bill to double
        defaults.set(bill, forKey: "bill_value") //Saves last bill input

        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])))
    }
}

SettingsViewController

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

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

    @IBAction func tipPercent(_ sender: Any) {
        defaults.set(settingsTipController.selectedSegmentIndex, forKey: "default_tip_index")
        defaults.synchronize()
    }

    @IBAction func splitNumber(_ sender: Any) {
    }

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

总的来说，这个简单的应用程序计算提示并在访问settingsViewController时更新第一个UISegment。

连接两个UISegmentedControllers

0 个答案: