Question

我是iOS开发中的新手。我想从我的Web服务中解析JSON数据，因为我已经编写了以下代码

- (void)viewDidLoad
{
 NSURL * url=[NSURL URLWithString:[NSString stringWithFormat:@"http://www.janvajevu.com/webservice/latest_post.php?page=%d",pageNum]];
dispatch_async(kBgQueue, ^{
    data = [NSData dataWithContentsOfURL: url];
    [self performSelectorOnMainThread:@selector(fetchedData:) withObject:data waitUntilDone:YES];
});

}
-(void)fetchedData:(NSData *)responsedata
{
if (responsedata.length > 0)
{
    NSError* error;
    self.json= [NSJSONSerialization JSONObjectWithData:responsedata options:kNilOptions error:&error];
    if ([[_json objectForKey:@"data"] isKindOfClass:[NSArray class]])
    {
        NSArray *arr = (NSArray *)[_json objectForKey:@"data"];
        [self.navuArray addObjectsFromArray:arr];
        [self.navuTable reloadData];
         NSLog(@"JSON Data %@",self.navuArray);
    }
    self.navuTable.hidden=FALSE;
}

此处Self.json是A JSON字典，self.navuArray是我的NSMutableArray，当我打印我的数组然后它返回Num。请给我解决方案。

Answer 1

在从阵列向对象添加对象之前，未初始化的navuArray。在调用数据之前对其进行初始化，然后向其中添加对象。

Answer 2

试试此代码

id jsonObject = [NSJSONSerialization JSONObjectWithData:webData options:kNilOptions error:&error];
  table = [[UITableView alloc]init];

    [dict objectForKey:@"data"];
    NSArray *array = (NSArray *)jsonObject;
    if ([[dict objectForKey:@"data"] isKindOfClass:[NSArray class]])
    {
     for(int i=0;i<[array count];i++)
     {

        dict1 = [array objectAtIndex:i];
        [postIdArr addObject:[dict objectForKey:@"post_id]];
        [postTitleArr addObject:[dict objectForKey:@"post_title"]];
        [postTitleSlungArr addObject:[dict objectForKey:@"post_title_slug"]];
        NSString *dateId = [dict objectForKey:@"post_date"];
        NSArray *dateArray = [dateId componentsSeparatedByString:@" "];
        [dateArrs addObject:[dateArray objectAtIndex:0]];
        [timeArrs addObject:[dateArray objectAtIndex:1]];
        //[dateIdArr addObject:[dict objectForKey:@"date"]];
        [postViewsArr addObject:[dict objectForKey:@"post_views"]];
        [imageArr addObject:[dict objectForKey:@"feature_image"]];
        [shortArr addObject:[dict objectForKey:@"short_description"]];
        [nameArr addObject:[dict objectForKey:@"author_name"]];


    }

iOS中没有解析JSON数据

2 个答案: