如何为 iOS 应用程序进行永久存储？

Question

我正在开发一个应用程序，用户可以在其中 select 地图上的建筑物并将它们保存在列表中。一切都很好，但我需要在应用关闭后保存用户 selection。

func action(_ gestureRecognizer:UIGestureRecognizer) { // GESTURE RECOGNIZER FUNCTION

    if gestureRecognizer.state == UIGestureRecognizerState.began {

        let touchPoint = gestureRecognizer.location(in: self.map)

        let newCoordinate = self.map.convert(touchPoint, toCoordinateFrom: self.map)

        let location = CLLocation(latitude: newCoordinate.latitude, longitude: newCoordinate.longitude)

        CLGeocoder().reverseGeocodeLocation(location, completionHandler: { (placemarks, error) -> Void in


            var title = ""

            if (error == nil) {

                if let p = placemarks?[0] {


                    var subThoroughfare:String = ""
                    var thoroughfare:String = ""

                    if p.subThoroughfare != nil {

                        subThoroughfare = p.subThoroughfare!

                    }

                    if p.thoroughfare != nil {

                        thoroughfare = p.thoroughfare!

                    }

Answer 1

您可以将建筑物 ID 保存到一个数组中，然后将该数组保存到 UserDefaults 中。

UserDefaults.standard.set(value: buildingIds, forKey: "myBuildingIds")

打开应用程序时，只需询问：

if let myBuildingArrays = UserDefaults.standard.value(forKey: "myBuildingIds"){
//And here you iterate each value of the array to load them into your list.
}

更多信息：https://developer.apple.com/reference/foundation/userdefaults

如何为 iOS 应用程序进行永久存储？

How to make permanent storage for an iOS app?

ios

swift

storage