+(NSString *)stringTOjson:(id)temps //把字典和数组转换成json字符串{NSData* jsonData =[NSJSONSerialization dataWithJSONObject:tempsoptions:NSJSONWritingPrettyPrinted error:nil];NSString *strs=[[NSString alloc] initWithData:jsonDataencoding:NSUTF8StringEncoding];return strs;}利用NSJSONSerialization序列化成NSData,再通过NSString 转成JSON字符串func toJSONString(dict:NSDictionary!)->NSString{var data = NSJSONSerialization.dataWithJSONObject(dict, options: NSJSONWritingOptions.PrettyPrinted, error: nil)var strJson=NSString(data: data, encoding: NSUTF8StringEncoding)return strJson}