需要在Superset的配置文件中添加以下几行代码，以允许其他域名下的网页通过iFrame加载Superset的内容：

from flask_appbuilder.security.manager import AUTH_OIDC
...
class MySecurityManager(SupersetSecurityManager):
    def view_menu(self):
        views = super().view_menu()
        for view in views:
            if "superset_dashboardview" in view["permission"] and "can_access" in view["permission"]:
                view["name"] = f'({view["name"]})'
        return views

    def get_user_roles(self, user):
        roles = super().get_user_roles(user)
        if user.is_authenticated:
            roles.append(self.auth_role_public)
        return roles
def init_app(app):
    if not os.path.exists(SQLALCHEMY_DATABASE_URI):
        os.makedirs(os.path.dirname(SQLALCHEMY_DATABASE_URI), exist_ok=True)
    with app.app_context():
        index = next((i for i, value in enumerate(app.extensions['appbuilder'].views) if value.name == 'Superset')), None
        if index is not None:
            app.extensions['appbuilder'].views[index] = SupersetView(
                Superset()
            )
        appbuilder = app.extensions['appbuilder']
        app.config.setdefault('SESSION_COOKIE_HTTPONLY', True)
        app.config.setdefault('SESSION_COOKIE_SAMESITE', 'Lax')
        app.config.setdefault('SESSION_COOKIE_SECURE', True)
        app.config.setdefault('SESSION_REFRESH_EACH_REQUEST', False)
        if app.config.get('OIDC_ENABLED'):
            app.config.setdefault('OIDC_RESOURCE_SERVER_ONLY', True)
        appbuilder.security_manager = MySecurityManager(appbuilder)

init_func_blueprint = partial(init_app)

同时，在Superset的配置文件（如superset_config.py）中添加以下几行代码：

from flask import Flask
from werkzeug.middleware.proxy_fix import ProxyFix
app.wsgi_app = ProxyFix(app.wsgi_app, x_proto=1, x_host=1)
app.before_request(PublicBlueprint.before_request)
app.register_blueprint(PublicBlueprint)

以启用CORS。通过以上操作，Superset的iFrame集成应该能够正常工作了。