NSDictionary在IOS中顯示爲零/目標c

Question

我正在通過Web服務接收阿拉伯數據。我將數據作爲JSON對象獲得，但是當我將值傳遞給NSDictionary時，它顯示nil並且無法獲得key/pair value.i接收值直到data，但我無法將其傳遞給NSDictionary。

下面是代碼：

(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { 
     NSDictionary* json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil]; 


    for (NSString *key in [json allKeys]) 
    { 

     NSArray *feed = [json objectForKey:key]; 

     for(int i=0; i<feed.count;i++) 
     { 
      for (NSString *key1 in [[feed objectAtIndex:i] allKeys]) 
      { 
       if([key1 isEqualToString:@"newsTitle"]) 
       { 
        NSString *value = [[feed objectAtIndex:i] objectForKey:key1]; 
        [NewsTitleArray addObject:value]; 

       } 
       else if([key1 isEqualToString:@"newsDescription"]) 
       { 
        NSString *value = [[feed objectAtIndex:i] objectForKey:key1]; 
        [NewsDescriptionArray addObject:value]; 

       }}}} 

Answer 1

您需要使用適當的編碼數據，通常阿拉伯文內容需要ISO-Latin編碼。雖然你的代碼是錯誤的，你需要使用正確的NSURLConnection的委託功能，以便獲得完整的數據，你試圖解析不完整的數據

見下

更改聲明一個變量

NSMutableData *receivedData; 

處理的委託調用

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { 

//This delegate function gets called multiple times while fetching the data.. 

     if(!receivedData){ 
      receivedData=[[NSMutableData alloc] initWithData:data]; 
     }else{ 
      [receivedData appendData:data]; 
     } 

} 

- (void)connectionDidFinishLoading:(NSURLConnection *)connection{ 
    //When the connection completes the processing, do you parsing 

    if(receivedData.length>0){ 
     NSString *string = [[NSString alloc] initWithData:receivedData encoding:NSISOLatin1StringEncoding]; 

     NSData *utf8Data = [string dataUsingEncoding:NSUTF8StringEncoding]; 

     NSDictionary* json = [NSJSONSerialization JSONObjectWithData:utf8Data options:kNilOptions error:nil]; 


    for (NSString *key in [json allKeys]) 
    { 

     NSArray *feed = [json objectForKey:key]; 

     for(int i=0; i<feed.count;i++) 
     { 
      for (NSString *key1 in [[feed objectAtIndex:i] allKeys]) 
      { 
       if([key1 isEqualToString:@"newsTitle"]) 
       { 
        NSString *value = [[feed objectAtIndex:i] objectForKey:key1]; 
        [NewsTitleArray addObject:value]; 

       } 
       else if([key1 isEqualToString:@"newsDescription"]) 
       { 
        NSString *value = [[feed objectAtIndex:i] objectForKey:key1]; 
        [NewsDescriptionArray addObject:value]; 

       } 
      } 
     } 
    } 
} 

注意：上面的代碼沒有經過測試，可能一開始不工作，但應該是這樣。

我希望它有幫助。

乾杯。