在CoreData中存儲位置（快速）

Question

我試圖弄清楚如何從JSON在CoreData存儲位置。 我正在使用此代碼從JSON API獲取數據並將其存儲在CoreData

let appDelegate = UIApplication.shared.delegate as! AppDelegate
let context = appDelegate.persistentContainer.viewContext
let newPok = NSEntityDescription.insertNewObject(forEntityName: "Person", into: context)

for jsonItem in json {   
    let item = jsonItem as! NSDictionary

    let pokemonName = item["name"]
    let pokemonDesc = item["description"]
    let pokemonLat = (item["location"] as! NSDictionary) ["latitude"]
    let pokemonLon = (item["location"] as! NSDictionary) ["longitude"]

    let coordinates = CLLocationCoordinate2D(latitude: pokemonLat as! CLLocationDegrees, longitude: pokemonLon as! CLLocationDegrees)

    let annotation = MKPointAnnotation()

    annotation.title = pokemonName as! String?
    annotation.subtitle = pokemonDesc as! String?

    annotation.coordinate = coordinates

    self.map.addAnnotation(annotation)

    newPok.setValue(pokemonName as! String, forKey: "name")
    newPok.setValue(pokemonDesc as! String, forKey: "desc")
    newPok.setValue(pokemonLat as! String, forKey: "lat")
    newPok.setValue(pokemonLon as! String, forKey: "lon")

    do {
        try context.save()
    } catch {
        print("not saved")
    }
}

但是，當我運行這段代碼時，總是會遇到fatal exception 。

error Domain=NSCocoaErrorDomain Code=134190 "(null)" UserInfo={entity=Person, property=lat, reason=Source and destination attribute types are incompatible}

我的數據庫有一個包含4個字符串的設置（名稱，描述，緯度，長度）

有人知道我在這里做錯什么嗎？

親切的問候，

約翰

Answer 1

您需要將緯度和經度屬性的數據類型從String更改為Integer16

Answer 2

好吧，我知道了。

我將核心數據屬性從string更改為double pokemonLat as! Double?並在代碼pokemonLat as! Double? pokemonLat as! Double? 。 那行得通。

感謝您的幫助！ 塗上它！