iOS：如何以编程方式更改应用程序语言而不重新启动应用程序

iOS：如何以编程方式更改应用程序语言而不重新启动应用程序？

swift
import UIKit
class ViewController: UIViewController {
    @IBOutlet weak var languagePicker: UIPickerView!
    let languages = ["English", "French", "Spanish"]
    override func viewDidLoad() {
        super.viewDidLoad()
        
        languagePicker.delegate = self
        languagePicker.dataSource = self
    }
    @IBAction func changeLanguage(_ sender: UIButton) {
        let selectedLanguage = languages[languagePicker.selectedRow(inComponent: 0)]
        saveLanguageSetting(selectedLanguage)
        changeAppLanguage(selectedLanguage)
    }
    func saveLanguageSetting(_ language: String) {
        UserDefaults.standard.set([language], forKey: "AppleLanguages")
        UserDefaults.standard.synchronize()
    }
    func changeAppLanguage(_ language: String) {
        guard let path = Bundle.main.path(forResource: language, ofType: "lproj") else {
            return
        }
        
        let bundle = Bundle(path: path)
        guard let localizedString = bundle?.localizedString(forKey: "hello_world", value: nil, table: nil) else {
            return
        }
        
        print(localizedString)
    }
}
extension ViewController: UIPickerViewDelegate, UIPickerViewDataSource {
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }
    
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return languages.count
    }
    
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return languages[row]
    }
}