如何從集合屬性中提取並快速插入新的集合模型

Question

我有_userLocations:[CLLocation]集合存儲用戶geoDatas，我想循環拋出_userLocations集合並提取時間戳記，緯度和經度屬性，並插入到稱為savedLocations:[Location]=[]模型集合中。 for循環，我有此錯誤_userLocations

'類型'[Location]'的值沒有成員'時間戳'

有人能幫我嗎 ？

我的模特

   class Location {

        @NSManaged var latitude: NSNumber?
        @NSManaged var longitude: NSNumber?
        @NSManaged var timestamp: NSDate?

    }

        for location in _userLocations {
            savedLocations.timestamp = location.timestamp
            savedLocations.latitude = location.coordinate.latitude
            savedLocations.longitude = location.coordinate.longitude
        }

Answer 1

之所以出現錯誤Value of type '[Location]' has no member 'timestamp'的原因是，因為您savedLocations的[Location]是[Location] 。 Array沒有timestamp屬性 。

您需要做的是創建一個新的Location對象並將其插入保存的savedLocations

for location in _userLocations {
    let newLocation = Location()
    newLocation.timestamp = location.timestamp
    newLocation.latitude = location.coordinate.latitude
    newLocation.longitude = location.coordinate.longitude

    savedLocations.append(newLocation)
}