思路：

• 申請商戶：https://kf.qq.com/
• 支付流程說明： 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
• 開發(fā)步驟官方文檔：https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=8_5

具體實施步驟：

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

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

• 在需要微信支付的控件處 調(diào)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的屬性在PayReq中定義 key的值要和接口返回的值一致
       request.partnerId = [paramDic valueForKey:@"partnerId"];
       /** 預(yù)支付訂單 從服務(wù)器獲取 */
       request.prepayId = [paramDic valueForKey:@"prepayId"];
       /** 商家根據(jù)財付通文檔填寫的數(shù)據(jù)和簽名 <暫填寫固定值Sign=WXPay>*/
       request.package = [paramDic valueForKey:@"package"];
       /** 隨機(jī)串，防重發(fā) */
       request.nonceStr = [paramDic valueForKey:@"nonceStr"];
       /** 時間戳，防重發(fā) */
       request.timeStamp = [paramDic valueForKey:@"timeStamp"];
       /** 商家根據(jù)微信開放平臺文檔對數(shù)據(jù)做的簽名, 可從服務(wù)器獲取霞溪，也可本地生成*/
       request.sign = [paramDic valueForKey:@"sign"];
       [WXApi sendReq: request completion: nil];
      }
    }
  }];
}

• 成功調(diào)起接口之后 在AppDelegate.m中進(jìn)行回調(diào)

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