Question

我正在尝试解析Firebase中的数据，我的数据对象看起来像JSON格式：

"Things" : {
    "Blah1" : {
      "Id" : 1,
      "Location" : [ {
        "DownVote" : 1,
        "Latitude" : 42.36455,
        "Longitude" : 71.05796,
        "Time" : "rerwr",
        "UpVote" : 1
      }, {
        "DownVote" : 3,
        "Latitude" : 13.454,
        "Longitude" : 213.343,
        "Time" : "dfsadf",
        "UpVote" : 1
      } ]
    }
  }

我的ThingModel看起来像这样：

public class ThingModel {
    private var _id: Int!
    private var _locationArray:[LocationModel]!
    var id: Int {
        return _pokedexId
    }

    var locations: [LocationModel] {
        return _locationArray
    }

    init(dictionary: Dictionary<String, AnyObject>) {
        if let id = dictionary["Id"] as? Int {
            _id = id
        }
        if let locations = dictionary["Location"] as? [LocationModel] {
            _locationArray = locations
        }
    }
}

我的LocationModel看起来像这样：

private var Latitude: Double!
    private var Longitude: Double!
    private var UpVotes: Int!
    private var DownVotes: Int!
    private var Time: String!
    private var ModelKey: String!

    var locationCoordinate: CLLocationCoordinate2D {
        let coordinate = CLLocationCoordinate2DMake(Latitude, Longitude)
        return coordinate
    }

    var upVotes: Int {
        return UpVotes
    }

    var downVotes: Int {
        return DownVotes
    }

    var time: String {
        return Time
    }

    init(key: String, dictionary: Dictionary<String, AnyObject>) {
        self._modelKey = key
        if let latitude = dictionary["Latitude"] as? Double {
            self.Latitude = latitude
        }
        if let longitude = dictionary["Longitude"] as? Double {
            self.Longitude = longitude
        }
        if let downVotes = dictionary["DownVote"] as? Int {
            self.DownVotes = downVotes
        }
        if let upVotes = dictionary["UpVote"] as? Int {
            self.UpVotes = upVotes
        }
        if let time = dictionary["Time"] as? String {
            self.Time = time
        }
    }

问题是，当我尝试在for循环中调用locations数组时，该数组被视为null。

以下是代码：

_REF_BASE.child("Things").observeEventType(.Value, withBlock: { snapshot in
        if let snapshots = snapshot.children.allObjects as? [FIRDataSnapshot]{
            for snap in snapshots {
                if let dict = snap.value as? Dictionary<String, AnyObject> {
                    let key = snap.key
                    let thingObject = thingModel(lobbyKey: key, dictionary: pokeDict)
                    for location in thingObject.locations {
                        let coord = location.locationCoordinate
                        let pin = MKPointAnnotation()
                        self.pinArray.append(pin)
                        pin.coordinate = coord
                        pin.title = thingObject.name
                        self.mapView.addAnnotation(pin)
                    }
                }
            }
        }
    })

总结一下，我的LocationModel数组返回为零，我不知道为什么。任何帮助将不胜感激！

Answer 1

您必须首先获取“位置”词典数组，然后迭代它们并使用词典和＆amp ;;初始化LocationModel对象。关键价值观。转换为[LocationModel]不会自动为您初始化LocationModel个对象。

以下是ThingModel的示例初始化程序，它将适当地初始化您的LocationModel数组，

init(dictionary: Dictionary<String, AnyObject>) {
    if let things = dictionary["Things"] as? Dictionary<String, AnyObject> {
        if let blah = things["Blah1"] as? Dictionary<String, AnyObject> {
            if let id = blah["Id"] as? Int {
                _id = id
            }

            if let locations = blah["Location"] as? [AnyObject] {
                var locationModelArray: [LocationModel] = []
                for location in locations {
                    locationModelArray.append(LocationModel(key: "key", dictionary: location as! Dictionary<String, AnyObject>))
                }

                _locationArray = locationModelArray
            }
        }
    }
}

自定义模型数组为零

1 个答案: