5 . 在要唤起微信支付的.m文件中，直接上代码方便ctrl+c, ctrl+v

pragma mark - 微信支付相关方法

• (void)weixinChooseAct {
  NSString appid,mch_id,nonce_str,sign,body,out_trade_no,total_fee,spbill_create_ip,notify_url,trade_type,*partner;
  //应用APPID
  appid = WX_appID;
  //微信支付商户号
  mch_id = MCH_ID;
  //产生随机字符串，这里最好使用和安卓端一致的生成逻辑
  nonce_str =[self generateTradeNO];
  body =@"微信支付时候看到的支付信息";
  //随机产生订单号用于测试，正式使用请换成你从自己服务器获取的订单号
  out_trade_no = self.gold_sn;
  //交易价格1表示0.01元，10表示0.1元
  total_fee = self.payCount;
  //获取本机IP地址，请再wifi环境下测试，否则获取的ip地址为error，正确格式应该是8.8.8.8
  spbill_create_ip =[getIPhoneIP getIPAddress];
  //交易结果通知网站此处用于测试，随意填写，正式使用时填写正确网站
  notify_url =@"www.cccuu.com";
  trade_type =@"APP";
  //商户密钥
  partner = WX_partnerKey;
  //获取sign签名
  DataMD5 *data = [[DataMD5 alloc] initWithAppid:appid mch_id:mch_id nonce_str:nonce_str partner_id:partner body:body out_trade_no:out_trade_no total_fee:total_fee spbill_create_ip:spbill_create_ip notify_url:notify_url trade_type:trade_type];
  sign = [data getSignForMD5];
  //设置参数并转化成xml格式
  NSMutableDictionary *dic = [NSMutableDictionary dictionary];
  [dic setValue:appid forKey:@"appid"];//公众账号ID
  [dic setValue:mch_id forKey:@"mch_id"];//商户号
  [dic setValue:nonce_str forKey:@"nonce_str"];//随机字符串
  [dic setValue:sign forKey:@"sign"];//签名
  [dic setValue:body forKey:@"body"];//商品描述
  [dic setValue:out_trade_no forKey:@"out_trade_no"];//订单号
  [dic setValue:total_fee forKey:@"total_fee"];//金额
  [dic setValue:spbill_create_ip forKey:@"spbill_create_ip"];//终端IP
  [dic setValue:notify_url forKey:@"notify_url"];//通知地址
  [dic setValue:trade_type forKey:@"trade_type"];//交易类型
  // 转换成xml字符串
  NSString *string = [dic XMLString];
  [self http:string];
  }

pragma mark - 拿到转换好的xml发送请求

• (void)http:(NSString *)xml {
  [MBProgressHUD showMessage:@"正在获取支付订单..."];
  AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
  //这里传入的xml字符串只是形似xml，但是不是正确是xml格式，需要使用af方法进行转义
  manager.responseSerializer = [[AFHTTPResponseSerializer alloc] init];
  [manager.requestSerializer setValue:@"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
  [manager.requestSerializer setValue:@"https://api.mch.weixin.qq.com/pay/unifiedorder" forHTTPHeaderField:@"SOAPAction"];
  [manager.requestSerializer setQueryStringSerializationWithBlock:^NSString *(NSURLRequest *request, NSDictionary *parameters, NSError *__autoreleasing *error) {
  return xml;
  }];
  //发起请求
  [manager POST:@"https://api.mch.weixin.qq.com/pay/unifiedorder" parameters:xml success:^(AFHTTPRequestOperation *operation, id responseObject) {
  NSString *responseString = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding] ;
  // LXLog(@"responseString is %@",responseString);
  //将微信返回的xml数据解析转义成字典
  NSDictionary *dic = [NSDictionary dictionaryWithXMLString:responseString];
  //判断返回的许可
  if ([[dic objectForKey:@"result_code"] isEqualToString:@"SUCCESS"] &&[[dic objectForKey:@"return_code"] isEqualToString:@"SUCCESS"] ) {
  //发起微信支付，设置参数
  PayReq *request = [[PayReq alloc] init];
  request.openID = [dic objectForKey:@"appid"];
  request.partnerId = [dic objectForKey:@"mch_id"];
  request.prepayId= [dic objectForKey:@"prepay_id"];
  request.package = @"Sign=WXPay";
  request.nonceStr= [dic objectForKey:@"nonce_str"];
  //将当前事件转化成时间戳
  NSDate *datenow = [NSDate date];
  NSString *timeSp = [NSString stringWithFormat:@"%ld", (long)[datenow timeIntervalSince1970]];
  UInt32 timeStamp =[timeSp intValue];
  request.timeStamp= timeStamp;
  // 签名加密
  DataMD5 *md5 = [[DataMD5 alloc] init];
  request.sign=[md5 createMD5SingForPay:request.openID partnerid:request.partnerId prepayid:request.prepayId package:request.package noncestr:request.nonceStr timestamp:request.timeStamp];
  // 调用微信
  [WXApi sendReq:request];
  [MBProgressHUD hideHUD];
  }else{
  LXLog(@"参数不正确，请检查参数");
  [MBProgressHUD hideHUD];
  [MBProgressHUD showError:@"支付错误！"];
  }
  } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
  LXLog(@"error is %@",error);
  [MBProgressHUD hideHUD];
  [MBProgressHUD showError:@"未完成支付"];
  }];
  }

pragma mark - 产生随机订单号

• (NSString *)generateTradeNO {
  static int kNumber = 15;

  NSString *sourceStr = @"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  NSMutableString *resultStr = [[NSMutableString alloc] init];
  srand(time(0)); // 此行代码有警告:
  for (int i = 0; i < kNumber; i++) {
  unsigned index = rand() % [sourceStr length];
  NSString *oneStr = [sourceStr substringWithRange:NSMakeRange(index, 1)];
  [resultStr appendString:oneStr];
  }
  return resultStr;
  }