從AFNetworking轉換JSON

Question

我正在使用AFNetworking從URL獲取JSON，JSON被解析並且應該轉換成NSData格式，然後將其轉換爲數組。但它似乎沒有工作。我想我是愚蠢的，因爲它以前的工作，但現在 -

-(void)loadFromServer{ 

     NSString *trendsURL = [NSString stringWithFormat:@"http://myurl.com/data.json"]; 

     NSURL *url = [NSURL URLWithString:trendsURL]; 
     NSURLRequest *request = [NSURLRequest requestWithURL:url]; 

     AFJSONRequestOperation *operation = [AFJSONRequestOperation 
              JSONRequestOperationWithRequest:request 
              success:^(NSURLRequest *request, NSHTTPURLResponse *response, id json) { 
               self.results = [json valueForKeyPath:@"data"]; 
              } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) { 
              }]; 

     [operation start]; 




     NSError *anError = nil; 
     NSArray *parsedElements = [NSJSONSerialization JSONObjectWithData:elementsData 
                    options:NSJSONReadingAllowFragments 
                    error:&anError]; 

     for (NSDictionary *aModuleDict in parsedElements){ 
      MosData *aMosModule = [[MosData alloc] initWithDictionary:aModuleDict]; 
      [elements addObject:aMosModule]; 
     } 
    } 

的數據顯示像視圖分別在集合中，沒有與此不同的觀點沒有問題，當我訪問文件數據的工作原理而不是服務器。

-(void)loadFromDisk{ 
    NSString *pathString = [[NSBundle mainBundle] pathForResource:@"data" ofType:@"json"]; 
    NSData *elementsData = [NSData dataWithContentsOfFile:pathString]; 

    NSError *anError = nil; 
    NSArray *parsedElements = [NSJSONSerialization JSONObjectWithData:elementsData 
                   options:NSJSONReadingAllowFragments 
                   error:&anError]; 

    for (NSDictionary *aModuleDict in parsedElements){ 
     MosData *aMosModule = [[MosData alloc] initWithDictionary:aModuleDict]; 
     [elements addObject:aMosModule]; 
    } 
} 

的JSON是牽強的，像這樣：

{ 
    "imageLink": "http://link.com/image.jpg", 
    "size": 1, 
    "title": "Food" 
    } 

我給它另一個去，和它仍然不工作。結果是一個聲明的NSArray。

-(void)loadFromServer{ 

    NSString *trendsURL = [NSString stringWithFormat:@"http://url.com/data.json"]; 

    NSURL *url = [NSURL URLWithString:trendsURL]; 
    NSURLRequest *request = [NSURLRequest requestWithURL:url]; 

    AFJSONRequestOperation *operation = [AFJSONRequestOperation 
             JSONRequestOperationWithRequest:request 
             success:^(NSURLRequest *request, NSHTTPURLResponse *response, id json) { 
              NSLog(@"Custom Mosaic: %@", json); 
              self.results = [json valueForKeyPath:@"data"]; 
             } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) { 
             }]; 

    [operation start]; 



    for (NSDictionary *aModuleDict in self.results){ 
     MosData *aMosModule = [[MosData alloc] initWithDictionary:aModuleDict]; 
     [elements addObject:aMosModule]; 
    } 
} 

我覺得這個問題實際上可能是這在繞過一點點出場，出於某種原因，它不會拿起在AFNetworking操作分析數據的結果。

-(id)init{ 
    self = [super init]; 

    if (self){ 
     elements = [[NSMutableArray alloc] init]; 
     [self loadFromServer]; 
    } 

    return self; 
} 

// WWDC 2012 proposed method 
+ (CustomMosDatasource *)sharedInstance { 
    static CustomMosDatasource *sharedInstance; 
    if (sharedInstance == nil) 
     sharedInstance = [CustomMosDatasource new]; 
    return sharedInstance; 
} 

#pragma mark - MosViewDatasourceProtocol 

-(NSArray *)mosElements{ 
    NSArray *retVal = elements; 
    return retVal; 
} 

日誌的結果僅僅是JSON：

Custom Mosaic: { 
    data =  (
       { 
      imageFilename = "http://distilleryimage6.instagram.com/9969123a6af311e2b6c722000a9d0edd_7.jpg"; 
      size = 1; 
      title = "Title"; 
     }, 

Answer 1

AFJSONRequestOperation *operation = [AFJSONRequestOperation 
             JSONRequestOperationWithRequest:request 
             success:^(NSURLRequest *request, NSHTTPURLResponse *response, id json) { 
              self.results = [json valueForKeyPath:@"data"]; 
              NSError *anError = nil; 
              NSArray *parsedElements = [NSJSONSerialization JSONObjectWithData:elementsData 
                   options:NSJSONReadingAllowFragments 
                   error:&anError]; 
    for (NSDictionary *aModuleDict in parsedElements){ 
     MosData *aMosModule = [[MosData alloc] initWithDictionary:aModuleDict]; 
     [elements addObject:aMosModule]; 
    } 
             } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) { 
             }]; 

    [operation start]; 

Answer 2

您的JSON似乎不具備的keyPath 「數據」，去掉valueForKeyPath：@ 「數據」，請貼在你的問題中「NSLog（@」Custom Mosaic：％@「，json）」的結果「。 該操作是異步的。請求返回數據後調用成功塊。請把代碼放在這樣的成功塊中

-(void)loadFromServer{ 

    NSString *trendsURL = [NSString stringWithFormat:@"http://url.com/data.json"]; 

    NSURL *url = [NSURL URLWithString:trendsURL]; 
    NSURLRequest *request = [NSURLRequest requestWithURL:url]; 

    AFJSONRequestOperation *operation = [AFJSONRequestOperation 
             JSONRequestOperationWithRequest:request 
             success:^(NSURLRequest *request, NSHTTPURLResponse *response, id json) { 
              NSLog(@"Custom Mosaic: %@", json); 
              // your json doesn't have keyPath "data" 
              self.results = json; 
              // Codes moved into success block 
              for (NSDictionary *aModuleDict in self.results){ 
               MosData *aMosModule = [[MosData alloc] initWithDictionary:aModuleDict]; 
               [elements addObject:aMosModule]; 
              } 

             } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) { 
             }]; 

    [operation start]; 
}