Swift：Flickrから写真を取得すると常に同じ写真が取り込まれます

Question

私はFlickrから写真を取得してcollectionViewに表示するUdacityのポートフォリオプロジェクト用のアプリを書いています。ボタンを押すと、collectionViewの写真が更新されます。しかし、検索パラメータのたびにページ番号が異なるにもかかわらず、新しい写真セットを取得することはできません。私のコードは次のとおりです。

func getPhotosURLFromFlickr(_ lat: AnyObject, lon: AnyObject, _ completionHandlerForGetPhotosURL: @escaping (_ imageURL: [String]?, _ error: NSError?) -> Void) { 

     taskForGetPagesFromFlickr(lat, lon: lon) { (parameters, error) in 
      if let error = error { 
       completionHandlerForGetPhotosURL(nil, error as NSError) 
      } else { 

       if let parameters = parameters { 
        print(parameters) 
        self.taskForGetPhotos(parameters, { (imageURLArray, error) in 
         if let error = error { 
          completionHandlerForGetPhotosURL(nil, error as NSError) 
         } else { 
          if let imageURLArray = imageURLArray { 
           completionHandlerForGetPhotosURL(imageURLArray, nil) 
          } 
         } 
        }) 
       } 
      } 
     } 
    } 

func taskForGetPagesFromFlickr(_ lat: AnyObject, lon: AnyObject, _ completionHandlerForGetPhotosURL: @escaping (_ parameters: [String: AnyObject]?, _ error: NSError?) -> Void) { 

     let parameters = [ 
      Constants.ParametersKey.Method: Constants.Methods.PhotoSearch as AnyObject, 
      Constants.ParametersKey.FlickrAPIKey : Constants.APIInfo.APIKey as AnyObject, 
      Constants.ParametersKey.Format: Constants.ParametersValues.JSON as AnyObject, 
      Constants.ParametersKey.NoJSONCallback: Constants.ParametersValues.DisableJSONCallback as AnyObject, 
      Constants.ParametersKey.PerPage: Constants.ParametersValues.Fifteen as AnyObject, 
      Constants.ParametersKey.Extras: Constants.ParametersValues.MediumURL as AnyObject] 

     var parametersWithCoord = parameters 
     parametersWithCoord[Constants.ParametersKey.lat] = lat 
     parametersWithCoord[Constants.ParametersKey.lon] = lon 

     let url = flickrURLFromParameters(parametersWithCoord) 
     let request = NSMutableURLRequest(url: url) 

     let task = session.dataTask(with: request as URLRequest) { (data, response, error) in 
      if let error = error { 
       completionHandlerForGetPhotosURL(nil, error as NSError) 
      } else { 
       self.convertDataWithCompletionHandler(data!, completionHandlerForConvertData: { (results, error) in 
        if let error = error { 
         completionHandlerForGetPhotosURL(nil, error as NSError) 
        } else { 
//      print(results) 
         guard let photosDict = results?["photos"] as? [String: AnyObject] else { 
          let userInfo = [NSLocalizedDescriptionKey : "NoPhotosFound"] 
          completionHandlerForGetPhotosURL(nil, NSError(domain: "NoPhotosFound", code: 1, userInfo: userInfo)) 
          return 
         } 

         guard let pages = photosDict[Constants.ParametersKey.Pages] as? Int else { 
          let userInfo = [NSLocalizedDescriptionKey : "NoPagesFound"] 
          completionHandlerForGetPhotosURL(nil, NSError(domain: "NoPagesFound", code: 1, userInfo: userInfo)) 
          return 
         } 

         let randomPageIndex = Int(arc4random_uniform(UInt32(pages))) 
         var searchParameters = parametersWithCoord 
         searchParameters[Constants.ParametersKey.Page] = randomPageIndex as AnyObject? 
         print("Number of pages: \(pages)") 
         print("Random page index: \(randomPageIndex)") 
         completionHandlerForGetPhotosURL(searchParameters, nil) 
        } 
       }) 
      } 
     } 

     task.resume() 
    } 

    func taskForGetPhotos(_ parameters: [String: AnyObject], _ completionHandlerForGetPhotosURL: @escaping (_ imageURL: [String]?, _ error: NSError?) -> Void) { 

     let url = flickrURLFromParameters(parameters) 
     let request = NSMutableURLRequest(url: url) 
     print(url) 
     let task = session.dataTask(with: request as URLRequest) { (data, response, error) in 
      if let error = error { 
       completionHandlerForGetPhotosURL(nil, error as NSError) 
      } else { 
       self.convertDataWithCompletionHandler(data!, completionHandlerForConvertData: { (results, error) in 
        if let error = error { 
         completionHandlerForGetPhotosURL(nil, error as NSError) 
        } else { 
//      print(results) 
         guard let photosDict = results?["photos"] as? [String: AnyObject] else { 
          let userInfo = [NSLocalizedDescriptionKey : "NoPhotosFound"] 
          completionHandlerForGetPhotosURL(nil, NSError(domain: "NoPhotosFound", code: 1, userInfo: userInfo)) 
          return 
         } 

         guard let photosArray = photosDict["photo"] as? [[String: AnyObject]] else { 
          let userInfo = [NSLocalizedDescriptionKey : "NoPhotosArrayFound"] 
          completionHandlerForGetPhotosURL(nil, NSError(domain: "NoPhotosArray", code: 1, userInfo: userInfo)) 
          return 
         } 

         var imageURLArray: [String] = [] 

         if photosArray.count != 0 { 
          for pics in photosArray { 
           guard let imageURLString = pics[Constants.ParametersValues.MediumURL] as? String else { 
            print("NoImageURLString Found") 
            return 
           } 

           imageURLArray.append(imageURLString) 
          } 
         } 
         print("ImageURLArray : \(imageURLArray)") 
         completionHandlerForGetPhotosURL(imageURLArray, nil) 
        } 
       }) 
      } 

     } 

     task.resume() 
    } 

私の更新ボタンをタップすると、ネットワークコードの上記のセットが実行され、私は二回ボタンをタップすると、私のprint文のような、次のとおりです。

FETCHING NEWページのCOLLECTION ...項目の 数0数：5712 ランダムページインデックス：490 https://api.flickr.com/services/rest?page=490&method=flickr.photos.search&format=json&lon=103.7940514843148&api_key=APIKEY & PER_PAGE = 15 & LAT = 1.411935988414726 &エキストラ= url_m & nojsoncallback = 1 ImageURLArray： [ "https://farm3.staticflickr.com/2059/32542810620_37312d07c9.jpg"、 "https://farm3.staticflickr.com/2330/32102051403_46e30a5eec.jpg"、 "https://farm3.staticflickr.com/2104/32529883860_17558a0acf.jpg"、 "https://farm3.staticflickr.com/2595/32778162441_db4a98d3cd.jpg"、 "https://farm3.staticflickr.com/2466/32087213853_257910d32d.jpg"、 "https://farm3.staticflickr.com/2029/32891916665_2d2d177e71.jpg"、 "https://farm4.staticflickr.com/3685/32878992915_38baaf513e.jpg"、 "https://farm1.staticflickr.com/631/32062787803_ed58defea5.jpg"、 " https://farm3.staticflickr.com/2332/32873171215_c807db5364.jpg " "https://farm3.staticflickr.com/2788/32825584606_7d2bff507c.jpg"、 "https://farm3.staticflickr.com/2479/32052120503_1317f70f1a.jpg"、 "https://farm3.staticflickr.com/2909/32023922664_d276f52369.jpg"、 "https://farm1.staticflickr.com/376/32023912434_9b89fc3d7b.jpg"、 " ランダムページインデックス：5383 https://api.flickr.com/services/rest?page=5383&method=flickr.photos.search&format=json&lon=103.7940514843148&api_key=APIKEY & PER_PAGE = 15 & LAT = 1.411935988414726 &エキストラ= url_mページの項目の 数が0数 " " https://farm3.staticflickr.com/2833/32734093131_0e8da333f4.jpg「]

FETCHING NEW COLLECTION ... & nojsoncallback = 1 ImageURLArray： [ "https://farm3.staticflickr.com/2059/32542810620_37312d07c9.jpg"、 "https://farm3.staticflickr.com/2330/32102051403_46e30a5eec.jpg"、 "https://farm3.staticflickr.com/2104/32529883860_17558a0acf.jpg"、 "https://farm3.staticflickr.com/2595/32778162441_db4a98d3cd.jpg"、 "https://farm3.staticflickr.com/2466/32087213853_257910d32d.jpg"、 "https://farm3.staticflickr.com/2029/32891916665_2d2d177e71.jpg"、 "https://farm4.staticflickr.com/3685/32878992915_38baaf513e.jpg"、 "https://farm1.staticflickr.com/631/32062787803_ed58defea5.jpg"、 "https://farm3.staticflickr.com/2332/32873171215_c807db5364.jpg"、 "https://farm3.staticflickr.com/2788/32825584606_7d2bff507c.jpg"、 "https://farm3.staticflickr.com/2479/32052120503_1317f70f1a.jpg"、 "https://farm3.staticflickr.com/2909/32023922664_d276f52369.jpg"、 "https://farm1.staticflickr.com/376/32023912434_9b89fc3d7b.jpg"、 "https://farm1.staticflickr.com/455/32018845514_22681384ae.jpg"、 「https://farm3.staticflickr.com/2833/32734093131_0e8da333f4.jpg」]

あなたは、検索ページは両方の時間のために異なっているが、imageURLArrayが実際に目であるにも関わらずということを理解するであろう同じ。理由を特定できないようです。

ありがとうございました。

Answer 1

何とか私は自分の問題を解決することができます。 randomPageIndexの最大数を100に制限し、ページを正常に更新します。

おそらく、私が気づいていないかもしれない最大の検索ページがFlickrにあります。