黑暗模式开启应用程序

Question

我在我的项目（Swift）中有一个TableViewController和一个ViewController。 我有一个开关可以改变我的应用程序的颜色（变暗）。 问题是它只在我所在的场景中改变它。如果我去另一个场景，它是白色的。

我的代码：

import UIKit

class BaseTableViewController: UITableViewController {
    @IBOutlet var InicioTable: UITableView!
    @IBOutlet weak var cell2: UITableViewCell!
    @IBOutlet var viewTable: UITableView!
    @IBOutlet weak var celldarkmode: UITableViewCell!
    @IBOutlet weak var label: UILabel!
    @IBOutlet weak var switchController: UISwitch!

    @IBAction func changeSwitch(_ sender: UISwitch) {
        if switchController.isOn == true
        {
            self.navigationController?.navigationBar.isTranslucent = false
            self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white]//user global variable
            self.navigationController?.navigationBar.barStyle = UIBarStyle.black //user global variable
            self.navigationController?.navigationBar.tintColor = UIColor.black //user global variable
            UIApplication.shared.statusBarStyle = .lightContent
            label.textColor = UIColor.white
            self.cell2.backgroundColor = UIColor.black
            self.tabBarController?.tabBar.barTintColor = UIColor.black
            view.backgroundColor = UIColor.init(red: 0.1, green: 0.1, blue: 0.1, alpha: 1.0)
        }
        else
        {
            self.navigationController?.navigationBar.isTranslucent = false
            self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.black]//user global variable
            self.navigationController?.navigationBar.barStyle = UIBarStyle.default //user global variable
            self.navigationController?.navigationBar.tintColor = UIColor.white //user global variable
            UIApplication.shared.statusBarStyle = .default
            label.textColor = UIColor.black
            self.cell2.backgroundColor = UIColor.white
            self.tabBarController?.tabBar.barTintColor = UIColor.white
            view.backgroundColor = UIColor.groupTableViewBackground
        }
    }
}

Answer 1

使用用户默认值在您的应用中保存该开关状态：

@IBAction func changeSwitch(_ sender: UISwitch) {
    let isDarkMode = userDefaults.bool(forKey: "isDarkMode")
    if isDarkMode == true {
        UserDefaults.standard.set(false, forKey: "isDarkMode")  // Set the state
    }
    else {
        UserDefaults.standard.set(true, forKey: "isDarkMode")  // Set the state
    }
}

---

然后将所有视图更改代码移动到要在其中更改颜色的每个视图控制器的viewDidLoad() ：

override func viewDidLoad() {

    super.viewDidLoad()

    let isDarkMode = UserDefaults.standard.bool(forKey: "isDarkMode")  // Retrieve the state

    if isDarkMode == true {
        self.navigationController?.navigationBar.isTranslucent = false
        self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white]//user global variable
        self.navigationController?.navigationBar.barStyle = UIBarStyle.black //user global variable
        self.navigationController?.navigationBar.tintColor = UIColor.black //user global variable
        UIApplication.shared.statusBarStyle = .lightContent
        label.textColor = UIColor.white
        self.cell2.backgroundColor = UIColor.black
        self.tabBarController?.tabBar.barTintColor = UIColor.black
        view.backgroundColor = UIColor.init(red: 0.1, green: 0.1, blue: 0.1, alpha: 1.0)
    }
    else {
        self.navigationController?.navigationBar.isTranslucent = false
        self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.black]//user global variable
        self.navigationController?.navigationBar.barStyle = UIBarStyle.default //user global variable
        self.navigationController?.navigationBar.tintColor = UIColor.white //user global variable
        UIApplication.shared.statusBarStyle = .default
        label.textColor = UIColor.black
        self.cell2.backgroundColor = UIColor.white
        self.tabBarController?.tabBar.barTintColor = UIColor.white
        view.backgroundColor = UIColor.groupTableViewBackground
    }
}