Firebase Async Dictionaryダウンロード（Swift）でオブジェクトの配列を作成

Question

私はSwiftを使い慣れました。 Firebase辞書をダウンロードしてオブジェクトの配列に変換するのに問題がありました。

以下の構文で何が間違っていますか？私は最後の2日間、これを理解しようとして失敗した。以下は私に範囲外のエラーのインデックスを与えます。これは、Firebase Dictionaryがまだダウンロードを完了していないか、またはループsytaxのために私のために欠陥があるためですか？多分両方？ありがとう。イベント用の位置データをダウンロードする

//モデル：

// Array of Location Objects 
var locationsArray:[Location] = [Location]() 

var ref = Firebase(url: "<MYFIREBASEURL>") 
var dictionaryOfRecommendations:[NSDictionary] = [NSDictionary]() 
var currentlyConstructingLocation:Location = Location() 

func getLocationData() { 

    let titleRef = self.ref.childByAppendingPath("events") 
    titleRef.observeSingleEventOfType(.Value, withBlock: { snapshot in 

     var tempDict = [NSDictionary]() 

     for item in snapshot.children { 

      let child = item as! FDataSnapshot 
      let dict = child.value as! NSDictionary 
      tempDict.append(dict) 
     } 

     self.dictionaryOfRecommendations = tempDict 

    }) 

    // Parse data from Firebase 

    // Loop through each dictionary and assign values to location object 
    var index:Int 
    for index in 0...dictionaryOfRecommendations.count { 

     // Current Json dictionary 
     let jsonDictionary:NSDictionary = self.dictionaryOfRecommendations[index] 

     self.currentlyConstructingLocation.title = jsonDictionary["title"] as! String! 
     self.currentlyConstructingLocation.locationsLatitudeArray = jsonDictionary["latitude"] as! Double 
     self.currentlyConstructingLocation.locationsLongitudeArray = jsonDictionary["longitude"] as! Double 

     // Append to Locations Array and start new Location 
     self.locationsArray.append(currentlyConstructingLocation) 
     self.currentlyConstructingLocation = Location() 

    } 

    // Notify the MainViewController that the Locations are ready. 
    ... 
} 

Answer 1

ここでジェイの便利指針に基づいて、質問上記の更新された正しいコードです。

//Firebase reference 
var ref = Firebase(url: "<MYFIREBASEURL") 

var locationsArray:[Location] = [Location]() 
var dictionaryOfRecommendations:[NSDictionary] = [NSDictionary]() 
var currentlyConstructingLocation:Location = Location() 

func getLocationData() { 

    let titleRef = self.ref.childByAppendingPath("events") 
    titleRef.observeSingleEventOfType(.Value, withBlock: { snapshot in 

     var tempDict = [NSDictionary]() 

     for item in snapshot.children { 

      let child = item as! FDataSnapshot 
      let dict = child.value as! NSDictionary 
      tempDict.append(dict) 

     } 

     self.dictionaryOfRecommendations = tempDict 
     self.ParseFirebaseData() 

    }) 
} 

func ParseFirebaseData() { 
    // Parse data from Firebase 

    // Loop through each dictionary and assign values to location object 
    var index:Int 
    for index in 0...dictionaryOfRecommendations.count - 1 { 

     // Current Json dictionary 
     let jsonDictionary:NSDictionary = self.dictionaryOfRecommendations[index] 

     self.currentlyConstructingLocation.title = jsonDictionary["title"] as! String! 
     self.currentlyConstructingLocation.locationsLatitudeArray = jsonDictionary["latitude"] as! Double 
     self.currentlyConstructingLocation.locationsLongitudeArray = jsonDictionary["longitude"] as! Double 

     // Append to Locations Array and start new Location 
     self.locationsArray.append(currentlyConstructingLocation) 
     self.currentlyConstructingLocation = Location() 

    } 
}