如何将CLCircularRegion保存到NSUserDeafults

import CoreLocation

// 创建一个CLCircularRegion对象
let region = CLCircularRegion(center: CLLocationCoordinate2D(latitude: 37.3317, longitude: -122.0307), radius: 100, identifier: "MyRegion")

// 将CLCircularRegion对象转换为NSData对象
let regionData = try? NSKeyedArchiver.archivedData(withRootObject: region, requiringSecureCoding: false)

// 将NSData对象保存到NSUserDeafults
UserDefaults.standard.set(regionData, forKey: "SavedRegion")

// 从NSUserDeafults中获取保存的NSData对象
if let savedRegionData = UserDefaults.standard.object(forKey: "SavedRegion") as? Data {
    // 使用NSKeyedUnarchiver将NSData对象转换为CLCircularRegion对象
    if let savedRegion = try? NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(savedRegionData) as? CLCircularRegion {
        // 使用保存的CLCircularRegion对象
        print(savedRegion)
    }
}