从Cloudkit中快速删除CKRecord

问题描述：

我想通过此功能更新用户的位置。最初它每次都保存用户的位置，但我添加了将在评论下方的代码。我怎样才能确保被删除的记录是旧的位置？从Cloudkit中快速删除CKRecord

let locationRecord = CKRecord(recordType: "location") 

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) 
    { 
     let location = locations.last 
     let center = CLLocationCoordinate2D(latitude: location!.coordinate.latitude, longitude: location!.coordinate.longitude) 
     let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01)) 
     self.mapView.setRegion(region, animated: true) 
     self.locationManager.stopUpdatingLocation()// 
     locationRecord.setObject(location, forKey: "location") 
     let publicData = CKContainer.defaultContainer().publicCloudDatabase 
     publicData.saveRecord(locationRecord) { record, error in 
     } 
      if error == nil 
      { 
       print("Location saved") 
       self.loc1 = location! 
      } 
     //testing code below 
     let operation = CKModifyRecordsOperation(recordsToSave: nil, recordIDsToDelete: [locationRecord.recordID]) 
     operation.savePolicy = .AllKeys 
     operation.modifyRecordsCompletionBlock = { added, deleted, error in 
      if error != nil { 
       print(error) 
      } else { 
       print("location updated") 
      } 
     } 
     CKContainer.defaultContainer().publicCloudDatabase.addOperation(operation) 
    }

你为什么想添加一个新的CKRecord和删除旧的，而不是只保留一个并更新它？ – Michael

我将如何修改现有的？ @michael – Steve

通过保留对现有参考的本地引用 - 可能在NSUserDefaults中。如果它不存在，则需要首次保存，否则，您需要获取现有记录并进行更新，然后将其保存回去。查看doco中的“获取现有记录” - https://developer.apple.com/library/ios/documentation/CloudKit/Reference/CKRecord_class/ – Michael

答

要做到这一点，最好的方法是更新现有的，正如@Michael指出的那样。简单的做法是在您第一次创建记录时，将recordID保存为默认值。例如，

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

    if defaults.objectForKey("locationRecordID") == nil{ 
     //Create a new record and save its id 
     locationRecord = CKRecord(recordType: "location") 
     defaults.setObject(locationRecord.recordID, forKey: "locationRecordID") 
     self.updateLocationRecord(locationRecord, locations) 
    }else{ 
     //Fetch the already existing record 
     let publicDB = CKContainer.defaultContainer().publicCloudDatabase 
     publicDB.fetchRecordWithID((defaults.objectForKey("locationRecordID") as! CKRecordID), completionHandler{ 
      (record, error) in 
      if error == nil{ 
      self.updateLocationRecord(record, locations) 
      }else{ 
      print("Error fetching previous record") 
      } 
     } 
    } 
}

创建一个新的功能，

func updateLocationRecord(locationRecord:CKRecord, locations:[CLLocation]){ 
    //Put your code from "let location..." to just above the testing code 
    //You may want to fix the block syntax in the call to saveRecord 
}

那么在原始的LocationManager方法，拿出一切，并把

self.getRecordsToUpdate(locations)

我在“updateRecord”上得到一个错误，你在哪里定义that @milesper – Steve

对不起，updateRecord是你放置存储和保存位置信息的代码的功能，就像你有abopd – milesper

你在哪里建议我把这个代码？它是否应该包含updateRecord中的删除部分？ @milesper – Steve

从Cloudkit中快速删除CKRecord

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