如何在iOS Swift中检查设备时间是否正确

import UIKit

func checkDeviceTime() {
    let deviceTime = Date()
    
    guard let url = URL(string: "http://timeapi.org/utc/now") else {
        return
    }
    
    let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
        if let error = error {
            print("Error: \(error.localizedDescription)")
            return
        }
        
        if let data = data,
           let timeString = String(data: data, encoding: .utf8),
           let networkTime = convertTimeStringToDate(timeString) {
            
            let timeDifference = deviceTime.timeIntervalSince(networkTime)
            
            let tolerance: TimeInterval = 5 // 设置容差范围为5秒钟
            
            if abs(timeDifference) > tolerance {
                // 设备时间不正确，可以提示用户或自动校准时间
                DispatchQueue.main.async {
                    let alertController = UIAlertController(title: "设备时间不正确", message: "请校准设备时间", preferredStyle: .alert)
                    alertController.addAction(UIAlertAction(title: "确定", style: .default, handler: { (_) in
                        // 校准设备时间的操作
                        // 使用 SystemPreferences.shared 来自动调整设备时间
                    }))
                    UIApplication.shared.keyWindow?.rootViewController?.present(alertController, animated: true, completion: nil)
                }
            }
        }
    }
    
    task.resume()
}

func convertTimeStringToDate(_ timeString: String) -> Date? {
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZ"
    return dateFormatter.date(from: timeString)
}

// 调用检查设备时间的函数
checkDeviceTime()