IOS 微信支付

思路：

• 申请商户：https://kf.qq.com/
• 支付流程说明： https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=8_3
• 微信支付集成包：https://developers.weixin.qq.com/doc/oplatform/Mobile_App/Access_Guide/iOS.html#jump2
• 开发步骤官方文档：https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=8_5

具体实施步骤：

• 接入SDK：https://developers.weixin.qq.com/doc/oplatform/Mobile_App/Access_Guide/iOS.html#jump2
• 在info -> URL Types -> URL Schemes中设置自己的appID
• 在appDelegate.m文件中 设置appID

//向微信注册
- (BOOL) application: (UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions {
  [WXApi registerApp: @"你的appID" universalLink: @"服务器地址"];
}

• 在需要微信支付的控件处 调起微信支付

- (void) weChatPay {
  [NSDictionary micDic = [NSDictionary alloc] init];
  [micDic setValue:useId forKey: @"userId"];
  
  [self.myViewModel appweChatpay: micDic requestResult:^(NSString * _Nonnull string, BOOL success) { //appweChatpay  支付接口
    if (success) {
      if (string != nil || string.length != 0) {
        NSRange range = [string rangeOfString: @"?"];
        NSString  *rightStr = [string substringFromIndex: range.location+1];
        NSArray *objArray = [rightStr componentsSeparatedByString: @"&"];
        [NSDictionary *paramDic = [NSDictionary alloc] init];
        for (int i=0; i<objArray.count; i++) {
          NSString *li = objArray[i];
          NSArray *key = [li componentsSeparatedByString: @"="];
          [paramDic setValue:key[1] forKey: key[0]];
        }
       PayReq *request = [[PayReq alloc] init];  //request的属性在PayReq中定义 key的值要和接口返回的值一致
       request.partnerId = [paramDic valueForKey:@"partnerId"];
       /** 预支付订单 从服务器获取 */
       request.prepayId = [paramDic valueForKey:@"prepayId"];
       /** 商家根据财付通文档填写的数据和签名 <暂填写固定值Sign=WXPay>*/
       request.package = [paramDic valueForKey:@"package"];
       /** 随机串，防重发 */
       request.nonceStr = [paramDic valueForKey:@"nonceStr"];
       /** 时间戳，防重发 */
       request.timeStamp = [paramDic valueForKey:@"timeStamp"];
       /** 商家根据微信开放平台文档对数据做的签名, 可从服务器获取，也可本地生成*/
       request.sign = [paramDic valueForKey:@"sign"];
       [WXApi sendReq: request completion: nil];
      }
    }
  }];
}

• 成功调起接口之后 在AppDelegate.m中进行回调

//支付返回结果
- (void)onResp:(BaseResp *)resp {
  if ([resp isKindOfClass:[PayResp class]]) {
    PayResp *payresp = (PayResp *)resp;
    [[NSNotificationCenter defaultCenter]
    postNotificationName:wxpayResultNotification object:@{@"resp":payresp}];
  }
}
//进行支付回调
- (BOOL)application:(UIApplication *)app openURL:(NSURL *)url options:(NSDictionary<UIApplicationOpenURLOptionsKey,id> *)options {
  return [WXApi handleOpenUrl: url delegate:self];
}