iOS微信支付

SDK接入

服务器签名版本

官方已经是建议使用服务器签名来接入微信支付，实际上从安全上考虑，确实是每个客户端不应该知道RAS密钥，也不需要每个客户端都写一遍签名的算法。

服务端接入流程文档：https://pay.weixin.qq.com/wiki/doc/api/app.php?chapter=8_3

商户系统和微信支付系统主要交互说明：

步骤1：用户在商户APP中选择商品，提交订单，选择微信支付。

步骤2：商户后台收到用户支付单，调用微信支付统一下单接口。参见【统一下单API】。

步骤3：统一下单接口返回正常的prepay_id，再按签名规范重新生成签名后，将数据传输给APP。参与签名的字段名为appId，partnerId，prepayId，nonceStr，timeStamp，package。注意：package的值格式为Sign=WXPay

步骤4：商户APP调起微信支付。api参见本章节【app端开发步骤说明】

步骤5：商户后台接收支付通知。api参见【支付结果通知API】

步骤6：商户后台查询支付结果。，api参见【查询订单API】

1.导入SDK文件

2.导入相关的系统库及文件。不导入会报错。

• SystemConfiguration.framework
• libz.tbd
• libsqlite3.0.tbd
• CoreTelephony.framework

3.配置info.plist

a.schemes ，注意，item0 这里要修改成商户自己的APPID

或者这样修改：

b.白名单

c.安全配置支持Http

当然这部分的配置，也可以通过修改XML来实现。

4.修改bitcode。

修改：

5.在AppDelegate 注册微信

导入#import "WXApiManager.h"

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
     //向微信注册wxd930ea5d5a258f4f
     [WXApi registerApp:@"wxb4ba3c02aa476ea1" withDescription:@"demo 2.0"];

     return YES;
 }

 - (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url {
     return  [WXApi handleOpenURL:url delegate:[WXApiManager sharedManager]];
 }

 - (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation {
     return [WXApi handleOpenURL:url delegate:[WXApiManager sharedManager]];
 }

6.接下来，就是发起请求支付了，实现上核心代码只有几行。

这部分代码在demo的WXApiRequestHandler--》jumpToBizPay 里。

   // 调起微信支付
   PayReq* req             = [[[PayReq alloc] init]autorelease];
   req.partnerId           = [dict objectForKey:@"partnerid"];
   req.prepayId            = [dict objectForKey:@"prepayid"];
   req.nonceStr            = [dict objectForKey:@"noncestr"];
   req.timeStamp           = stamp.intValue;
   req.package             = [dict objectForKey:@"package"];
   req.sign                = [dict objectForKey:@"sign"];
   [WXApi sendReq:req];

7.不管支付成功还是失败，结果会返回到WXApiManager--》onResp 方法下

 switch (resp.errCode) {
             case WXSuccess:
                 strMsg = @"支付结果：成功！";
                 NSLog(@"支付成功－PaySuccess，retcode = %d", resp.errCode);
                 break;

             default:
                 strMsg = [NSString stringWithFormat:@"支付结果：失败！retcode = %d, retstr = %@", resp.errCode,resp.errStr];
                 NSLog(@"错误，retcode = %d, retstr = %@", resp.errCode,resp.errStr);
                 break;
         }

我们直接处理回调结果即可。

客户端进行签名

1.导入文件。官方已经不提供这个SDK的下载了，我已经打包到源代码了，2015年3月11号最新修改的版本

2.里面有两个文件是非arc的，我们需要设置一下 -fno-objc-arc

3.导入系统库及info.list配置，请参数上面服务端签名。

4.AppDelegate配置

1）导入头文件

 #import "WXApi.h"
 #import "payRequsestHandler.h"

2）实现微信代理

 @interface AppDelegate ()<WXApiDelegate>

 @end

3）注册微信，及微信支付回调

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
     // Override point for customization after application launch.
     //向微信注册
     [WXApi registerApp:APP_ID withDescription:@"demo 2.0"];

     return YES;
 }

 - (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url
 {
     return  [WXApi handleOpenURL:url delegate:self];
 }

 - (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
 {
     return  [WXApi handleOpenURL:url delegate:self];
 }

 // 微信支付成功或者失败回调
 -(void) onResp:(BaseResp*)resp
 {
     NSString *strMsg = [NSString stringWithFormat:@"errcode:%d", resp.errCode];
     NSString *strTitle;

     if([resp isKindOfClass:[SendMessageToWXResp class]])
     {
         strTitle = [NSString stringWithFormat:@"发送媒体消息结果"];
     }
     if([resp isKindOfClass:[PayResp class]]){
         // 支付返回结果，实际支付结果需要去微信服务器端查询
         strTitle = [NSString stringWithFormat:@"支付结果"];

         switch (resp.errCode) {
             case WXSuccess:
                 strMsg = @"支付结果：成功！";
                 NSLog(@"支付成功－PaySuccess，retcode = %d", resp.errCode);
                 break;

             default:
                 strMsg = [NSString stringWithFormat:@"支付结果：失败！retcode = %d, retstr = %@", resp.errCode,resp.errStr];
                 NSLog(@"错误，retcode = %d, retstr = %@", resp.errCode,resp.errStr);
                 break;
         }
     }
     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:strTitle message:strMsg delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
     [alert show];
 }

5.写方法直接在支付时调用

 - (void)payForWechat
 {
     // 创建支付签名对象
     payRequsestHandler *req = [[payRequsestHandler alloc] init];
     // 初始化支付签名对象
     [req init:APP_ID mch_id:MCH_ID];
     // 设置密钥
     [req setKey:PARTNER_ID];

     NSMutableDictionary *dict = [req sendPay_demo];

     if(dict != nil){
         NSMutableString *retcode = [dict objectForKey:@"retcode"];
         if (retcode.intValue == ){
             NSMutableString *stamp  = [dict objectForKey:@"timestamp"];

             // 调起微信支付
             PayReq* req             = [[PayReq alloc] init];
             req.openID              = [dict objectForKey:@"appid"];
             req.partnerId           = [dict objectForKey:@"partnerid"];
             req.prepayId            = [dict objectForKey:@"prepayid"];
             req.nonceStr            = [dict objectForKey:@"noncestr"];
             req.timeStamp           = stamp.intValue;
             req.package             = [dict objectForKey:@"package"];
             req.sign                = [dict objectForKey:@"sign"];
             [WXApi sendReq:req];
             //日志输出
             NSLog(@"appid=%@\npartid=%@\nprepayid=%@\nnoncestr=%@\ntimestamp=%ld\npackage=%@\nsign=%@",req.openID,req.partnerId,req.prepayId,req.nonceStr,(long)req.timeStamp,req.package,req.sign );
         }else{
             [self alert:@"提示信息" msg:[dict objectForKey:@"retmsg"]];
         }
     }else{
         [self alert:@"提示信息" msg:@"服务器返回错误，未获取到json对象"];
     }
 }

 // 客户端提示信息
 - (void)alert:(NSString *)title msg:(NSString *)msg
 {
     UIAlertView *alter = [[UIAlertView alloc] initWithTitle:title message:msg delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];

     [alter show];
 }