Swift 3：計數從JSON讀取的數據

我是Swift新手，我正在轉換一些Objective-C代碼。我有從數據庫中讀取ID和電影流派的代碼。我需要循環瀏覽這些信息，但我無法弄清楚如何統計id /流派信息。我有現在的硬編碼：Swift 3：計數從JSON讀取的數據

let url = URL(string: "https://api.themoviedb.org/3/genre/movie/list?api_key=818396bc0172f0f1d446cb4ffc92b7d8&language=en-US") 
    do { 
    let allData = try Data(contentsOf: url!) 
    let info = try JSONSerialization.jsonObject(with: allData, options: JSONSerialization.ReadingOptions.allowFragments) as! [String : AnyObject] 
    if let results = info["genres"] { 
     print(results) 
     for x in 0...18 { // I don't want to hardcode the number 18 
      let id = results[x] as! [String : AnyObject] 
      print(id) 
     } 
    } 
    } catch { 
    }

我將在那裏我存儲在一個字典和快速列舉的信息，通過它的Objective-C的項目：

 NSURL *url = [[NSURL alloc]initWithString:GENRES_LINK]; 
     NSData *data = [[NSData alloc] initWithContentsOfURL:url]; 
     NSDictionary *results = [[NSJSONSerialization JSONObjectWithData:data options:0 error:nil] objectForKey:@"genres"]; 
     NSMutableString *genres = [NSMutableString stringWithString:@"Genres: "]; 
     for (NSDictionary *key in [self.movies[x] objectForKey:@"genres"]) { 
      for (NSDictionary *key2 in results) { 
       if ([[key2 objectForKey:@"id"] isEqual:key]) { 
        [genres appendString:[NSString stringWithFormat:@"%@. ",[key2 objectForKey:@"name"]]]; 
        break; 
       } 
      } 
     }

來源

2017-04-04 Bobby

你試過'的（鍵，值）的結果{...}'？這應該讓你訪問該特定json對象中的所有鍵/值對。 –

您正在尋找Swift中相應的「for-in」/「for each」循環（這將是您尋找研究的關鍵詞）：https：//developer.apple.com/library/內容/文檔/雨燕/概念/ Swift_Programming_Language/ControlFlow.html – Larme

我看genres是JSONArray ，所以你應該將它轉換爲字典的數組，並使用for - in訪問陣列中的每個項目：

let url = URL(string: "https://api.themoviedb.org/3/genre/movie/list?api_key=818396bc0172f0f1d446cb4ffc92b7d8&language=en-US") 
do { 
    let allData = try Data(contentsOf: url!) 
    let info = try JSONSerialization.jsonObject(with: allData, options: JSONSerialization.ReadingOptions.allowFragments) as! [String: Any] 
    if let results = info["genres"] as? [[String: Any]] { 
     print(results) 
     for id in results { 
      print(id) 
     } 
    } 
} catch { 
}

來源

2017-04-04 13:29:15

Swift 3：計數從JSON讀取的數據

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