ios从有 导航栏pop回无导航栏viewcontroller的时候导航栏出现空白问题

只需要在无导航栏界面的viewWillAppear 设置setNavigationBarHidden:animated:的animated参数为YES即可

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    [self.navigationController setNavigationBarHidden:YES animated:YES];
}