我想在UIViewController的扩展中覆盖preferredStatusBarStyle，如下所示:extensionUIViewController{openoverridevarpreferredStatusBarStyle:UIStatusBarStyle{return.lightContent}}编译器抛出此错误Getterfor'preferredStatusBarStyle'withObjective-Cselector'preferredStatusBarStyle'conflictswithmethod'preferredStatusBarStyle()'wit