如果 Swift 中存在 NSUserDefault，则尝试更新 CLLocation

Posted 2023-02-24

【中文标题】如果 Swift 中存在 NSUserDefault，则尝试更新 CLLocation

【英文标题】：Trying to update CLLocation if NSUserDefault Exists in Swift

【发布时间】：2016-09-20 21:56:44

【问题描述】：

最初我试图将 CLLocation 保存为 NSUserDefault 值，然后将其作为 CKRecord 存储在 CLoudkit 中，但出现错误：“defaults.setObject(locationRecord.recordID, forKey: "locationRecordID")”原因是“尝试将非属性列表对象设置为关键 locationRecordID 的 NSUserDefaults/CFPreferences 值”。所以现在我试图将 lat 和 long 作为默认值保存并替换 Cloudkit 中的旧位置。我目前在“publicDB.fetchRecordWithID((defaults.objectForKey("Location") as!CKRecordID),completionHandler:”行出现“Thread 1 SIGABRT”错误原因是“无法将 '__NSCFDictionary' (0x1a1bec968) 类型的值转换为 'CKRecordID'。”

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
    
        let location = locations.last
        self.loc1 = location!
        let center = CLLocationCoordinate2D(latitude: location!.coordinate.latitude, longitude: location!.coordinate.longitude)
        let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.004, longitudeDelta: 0.004))
        self.mapView.setRegion(region, animated: true)
        self.locationManager.stopUpdatingLocation()
        self.locationManager.startMonitoringSignificantLocationChanges()

        self.getRecordToUpdate(locations)

        let lat: CLLocationDegrees = center.latitude
        self.lat1 = lat
        let long: CLLocationDegrees = center.longitude
        self.long1 = long

        locationRecord.setObject(location, forKey: "location")
        let publicData = CKContainer.defaultContainer().publicCloudDatabase
        publicData.saveRecord(locationRecord)  record, error in
        
        if error == nil
        
            print("Location saved")
        
    

func getRecordToUpdate(locations:[CLLocation])
    
        let defaults = NSUserDefaults.standardUserDefaults()
        var locationRecord:CKRecord

        if defaults.objectForKey("Location") == nil
            locationRecord = CKRecord(recordType: "location")
            let locationDict = ["lat": lat1, "lng": long1]//
            defaults.setObject(locationDict, forKey: "Location")//
            self.updateLocationRecord(locationRecord, locations: locations)
            print("new")
        else
            let publicDB = CKContainer.defaultContainer().publicCloudDatabase
            publicDB.fetchRecordWithID((defaults.objectForKey("Location") as! CKRecordID),completionHandler:   
                (record, error) in
                if error == nil
                    self.updateLocationRecord(record!, locations: locations)
                    print("fetched record")
                else
                    print("Error fetching previous record")
                
            )
        
    
    func updateLocationRecord(locationRecord:CKRecord, locations:[CLLocation])
    
        let location = locations.last
        locationRecord.setObject(location, forKey: "location")
        let publicData = CKContainer.defaultContainer().publicCloudDatabase
        publicData.saveRecord(locationRecord)  record, error in
        
        if error == nil
        
            print("Location saved")
        
    

【参考方案1】：

试试这个

您可以将 NSData 保存到 NSUserDefaults。因此，您只需将 CLLocation 对象转换为 NSData，如下所示：

// saving your CLLocation object
let locationData = NSKeyedArchiver.archivedDataWithRootObject(your location here)
NSUserDefaults.standardUserDefaults().setObject(locationData, forKey: "locationData")

// loading it
if let loadedData = NSUserDefaults.standardUserDefaults().dataForKey("locationData") 
    if let loadedLocation = NSKeyedUnarchiver.unarchiveObjectWithData(loadedData) as? CLLocation 
        println(loadedLocation.coordinate.latitude)
        println(loadedLocation.coordinate.longitude)