iOS FluwxPlugin.m 下的 UIViewController *vc = UIApplication.sharedApplication.keyWindow.rootViewController; 在UIScene 模式会有兼容问题

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• (void)handleAuthByPhoneLogin:(FlutterMethodCall *)call result:(FlutterResult)result {
  UIViewController *vc = UIApplication.sharedApplication.keyWindow.rootViewController;
  SendAuthReq *authReq = [[SendAuthReq alloc] init];
  authReq.scope = call.arguments[@"scope"];
  authReq.state = (call.arguments[@"state"] == (id) [NSNull null]) ? nil : call.arguments[@"state"];
  [WXApi sendAuthReq:authReq viewController:vc delegate:self completion:^(BOOL success) {
  result(@(success));
  }];
  }