字典转成字符串iOS

  //需要把字典转化为字符串传过去

    NSData* data = [NSJSONSerialization dataWithJSONObject:commentDict options:NSJSONWritingPrettyPrinted error:nil];

    NSString *bodyData = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

    NSDictionary* dict = @{@"type":@"20",@"commentJson":bodyData};