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在CoreData中存储位置(快速)

[英]Store location in CoreData (Swift)

我试图弄清楚如何从JSONCoreData存储位置。 我正在使用此代码从JSON API获取数据并将其存储在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,当我运行这段代码时,总是会遇到fatal exception

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

我的数据库有一个包含4个字符串的设置(名称,描述,纬度,长度)

有人知道我在这里做错什么吗?

亲切的问候,

约翰

您需要将纬度和经度属性的数据类型从String更改为Integer16

好吧,我知道了。

我将核心数据属性从string更改为double pokemonLat as! Double?并在代码pokemonLat as! Double? pokemonLat as! Double? 那行得通。

感谢您的帮助! 涂上它!

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