实用技术——支付_微信

• 与微信官方签署在线协议

• 导入微信支付需要的SDK相关文件

• 配置App跳转的白名单

• 添加URL Schemes

• 配置代码

  1. 在AppDelegate.m中向微信注册第三方应用
     //向微信终端程序注册第三方应用
     [WXApi registerApp:wexinAppId];
  2. 确保支付结果回调方法能够接受到，在AppDelegate.m中添加一下代码
     - (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation{
     if([url.host isEqualToString:@"pay"]){
     return [WXApi handleOpenURL:url delegate:[WXApiManager sharedManager]];
     }else{
     return YES;
     }
     }
     - (BOOL)application:(UIApplication *)application handleOpenURL:(nonnull NSURL *)url
     {
     if([url.host isEqualToString:@"pay"]){
     return [WXApi handleOpenURL:url delegate:[WXApiManager sharedManager]];
     }else{
     return YES;
     }
     }
     - (BOOL)application:(UIApplication *)app openURL:(NSURL *)url options:(NSDictionary *)options{
     if([url.host isEqualToString:@"pay"]){
     return [WXApi handleOpenURL:url delegate:[WXApiManager sharedManager]];
     }else{
     return YES;
     }
     }

  • 设置支付信息，调用微信支付
    NSMutableDictionary dict = [result[@"data"] objectAtIndex:0];
    //调起微信支付
    PayReq req = [[PayReq alloc] init];
    //由用户微信号和AppID组成的唯一标识
    req.openID = [dict objectForKey:@"appid"];
    //商家向财付通申请的商家id
    req.partnerId = [dict objectForKey:@"mch_id"];
    //预支付订单
    req.prepayId = [dict objectForKey:@"prepay_id"];
    //随机串，防重发
    req.nonceStr = [dict objectForKey:@"nonce_str"];
    //时间戳，防重发
    req.timeStamp = [[dict objectForKey:@"timeStamp"] intValue];
    //商家根据财付通文档填写的数据和签名
    req.package = @"Sign=WXPay";
    //商家根据微信开放平台文档对数据做的签名
    req.sign = [self getWeiXinPaySign:req];
    [WXApi sendReq:req];

  • 处理支付结果
    为了对支付结果可以进行不同的操作处理，可以创建一个单例对象来管理。
    #import
    #import "WXApi.h"
    @protocol WXApiManagerDelegate
    @optional
    - (void)managerDidRecvPayForSuccessResponse:(PayResp *)response;

    - (void)managerDidRecvPayForFailResponse:(PayResp *)response;
    @end
    
    @interface WXApiManager : NSObject
    @property (nonatomic, assign) id delegate;
    + (instancetype)sharedManager;
    @end
    
    #import "WXApiManager.h"
    @implementation WXApiManager
    
    #pragma mark - LifeCycle
    +(instancetype)sharedManager {
      static dispatch_once_t onceToken;
      static WXApiManager *instance;
      dispatch_once(&onceToken, ^{
      instance = [[WXApiManager alloc] init];
      });
    return instance;
    }
    
    - (void)dealloc {
      self.delegate = nil;
      [super dealloc];
    }
    
    #pragma mark - WXApiDelegate
    - (void)onResp:(BaseResp *)resp {
        if([resp isKindOfClass:[PayResp class]]){
            switch (resp.errCode) {
                case WXSuccess:
                {
                    if (_delegate && [_delegate respondsToSelector:@selector(managerDidRecvPayForSuccessResponse:)]) {
                    PayResp *payResp = (PayResp *)resp;
                    [_delegate managerDidRecvPayForSuccessResponse:payResp];
            }
        }
            break;
            
        default:
            if (_delegate && [_delegate respondsToSelector:@selector(managerDidRecvPayForFailResponse:)]) {
                PayResp *payResp = (PayResp *)resp;
                [_delegate managerDidRecvPayForFailResponse:payResp];
            }
            break;
        }
      }
    }
    @end
    

  • 签名sign生成方法
    //获取微信签名
    -(NSString)getWeiXinPaySign:(PayReq)req
    {
    NSMutableDictionary *signParams = [NSMutableDictionary dictionary];
    [signParams setObject: req.openID forKey:@"appid"];
    [signParams setObject: req.nonceStr forKey:@"noncestr"];
    [signParams setObject: req.package forKey:@"package"];
    [signParams setObject: req.partnerId forKey:@"partnerid"];
    [signParams setObject: [NSString stringWithFormat:@"%u",(unsigned int)req.timeStamp] forKey:@"timestamp"];
    [signParams setObject: req.prepayId forKey:@"prepayid"];
    //生成签名
    NSString *sign = [self createMd5Sign:signParams];
    return sign;
    }

    //创建package签名
    -(NSString*) createMd5Sign:(NSMutableDictionary*)dict
    {
        NSMutableString *contentString  =[NSMutableString string];
        NSArray *keys = [dict allKeys];
        //按字母顺序排序
        NSArray *sortedArray = [keys sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
            return [obj1 compare:obj2 options:NSNumericSearch];
        }];
        //拼接字符串
        for (NSString *categoryId in sortedArray) {
            if (![[dict objectForKey:categoryId] isEqualToString:@""] &&
                ![categoryId isEqualToString:@"sign"] &&
                ![categoryId isEqualToString:@"key"]){
            
                [contentString appendFormat:@"%@=%@&", categoryId, [dict objectForKey:categoryId]];
               }
            }
        //添加key字段,商户密钥
        [contentString appendFormat:@"key=%@", @"xxxxxxxxxxx"];
        //得到MD5 sign签名
        NSString *md5Sign =[WXUtil md5:contentString];
        return md5Sign;
      }
    //md5 encode
    +(NSString *) md5:(NSString *)str
    {
        const char *cStr = [str UTF8String];
        unsigned char digest[CC_MD5_DIGEST_LENGTH];
        CC_MD5( cStr, (unsigned int)strlen(cStr), digest );
    
        NSMutableString *output = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
        //这里的x是小写则产生的md5也是小写，是大写则产生的md5是大写
        for(int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)
            [output appendFormat:@"%02X", digest[i]];
    
        return output;
    }
    

• 注意事项：

  1. 签名Sign一定得进行MD5加密，格式严格按照微信官方方式加密。
     prepayId（预支付订单）失效、过期。
     如果出现上述问题（一般是参数错误），就会造成调起微信支付，只出现一个确定按钮
  • 支付结果无法获取回调？
    确保第四步的b步骤是否实现
  • 如果APP里面使用了友盟或者ShareSDK做分享，那就不用再导入SDK了，否则会出现一些诡异的问题，
    例如无法调起手机微信客户端、无法调起微信客户端web页面，调起了但是一闪而过。这都基本上都是因为分享的SDK里面已经包括了微信的SDK。所以如果出现诡异的错误了看看是不是两个冲突了。
  • 如果你用了友盟社会化分享来做微信登录的话，那么你要先用友盟注册微信，后调用微信SDK注册
    [UMSocialWechatHandlersetWXAppId:SHappSecret:SH url:SHAREURL]；
    [WXApiregisterApp:SHARE_WX withDescription:@"demo"];
  • 微信无法调起
    未安装微信、未将微信加入白名单