Push与Present混用

UIViewController *controller = [[UIViewController alloc] init];
UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController: controller];//presentViewnController之后push无效
nav.modalPresentationStyle = UIModalPresentationFullScreen;//全屏显示，iOS13之后推送出来的控制器不是全屏
[self presentViewController: nav animated:YES completion:nil];