IOS:如何在后台拉取中检测用户更改时区

import Foundation

class TimeZoneManager {
    static let shared = TimeZoneManager()
    
    private init() {}
    
    func startMonitoringTimeZoneChanges() {
        NotificationCenter.default.addObserver(self, selector: #selector(timeZoneDidChange), name: .NSCurrentLocaleDidChange, object: nil)
    }
    
    @objc func timeZoneDidChange() {
        print("Time zone has changed")
        // 更新应用中的时间显示或相关逻辑
    }
}

func application(_ application: UIApplication, performFetchWithCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
    let currentTimeZone = TimeZone.current
    if let lastTimeZone = UserDefaults.standard.value(forKey: "lastTimeZone") as? TimeZone, lastTimeZone != currentTimeZone {
        // 时区发生变化
        UserDefaults.standard.set(currentTimeZone, forKey: "lastTimeZone")
        // 更新应用中的时间显示或相关逻辑
    }
    completionHandler(.newData)
}