以NSString类型传递Json格式的参数

NSDictionary *categoryDic = [NSDictionary dictionaryWithObjectsAndKeys:@"技术",@"0", nil];

if ([NSJSONSerialization isValidJSONObject:categoryDic])

{

NSError *error;

NSData *categoryData = [NSJSONSerialization dataWithJSONObject:categoryDic options:NSJSONWritingPrettyPrinted error:&error];

jsonString=[[NSString alloc] initWithData:categoryData encoding:NSUTF8StringEncoding];

CLog(@"JSON:%@",jsonString);

}

[_knowledgePageClient getKnowledgeListWithStart:start limit:kHomeListLimit name:jsonString];