AFNetworking网上加载数据及JSON解析

- (void)downloadData
{
    NSString *urlString = [NSString stringWithFormat:LIMIT_URL,_page,_categoryId];
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    manager.responseSerializer = [AFHTTPResponseSerializer serializer];
    [manager GET:urlString parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
        //JSON解析数据
        NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil];
        NSArray *apps = dict[@"applications"];
        for (NSDictionary *appDict in apps) {
            AppModel *model = [[AppModel alloc] init];
            [model setValuesForKeysWithDictionary:appDict];
            model.desc = appDict[@"description"];
            [_dataArray addObject:model];

            [self.tableView reloadData];//若刷新表格需在block块内
        }
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        
    }];
}