[fix]取消购买显示toast

lib/module/member/member_controller.dart

@@ -456,6 +456,10 @@ class MemberController extends BaseController implements PaymentStatusCallback {
     } else {
       LoadingDialog.hide();
       print('购买失败: ${result['error']}');
+      if (Platform.isIOS) {
+        ToastUtil.show("支付失败，请稍后重试");
+        return;
+      }
       showBackPaymentFailureDialog();
     }
   }