问题描述

我在 UINavigationController 中有三个 viewController.在第二个中，我需要隐藏导航栏而不是后退按钮和其他栏按钮.由于这个原因，我不能使用 isNavigationBarHidden = true
目前我正在按以下方式处理上述问题:

I have three viewControllers in a UINavigationController. In the second one I need to hide the navigation bar but not the back button and other bar button. For this reason I can't use isNavigationBarHidden = true
Currently I am handling the above as follows :

第一个视图控制器:

override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.navigationController?.navigationBar.barTintColor = Constants.kThemeRedColor
        self.navigationController?.navigationBar.tintColor = UIColor.white
        self.navigationController?.navigationBar.barStyle = .black
        self.navigationController?.navigationBar.isTranslucent = false
    }

第二个viewController(只隐藏导航栏):

Second viewController (hide only nav bar) :

override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: UIBarMetrics.default)
        self.navigationController?.navigationBar.shadowImage = UIImage()
        self.navigationController?.navigationBar.isTranslucent = true
        self.navigationController?.view.backgroundColor = UIColor.clear
    } 

这里的问题是，当我在 firstViewController 之间导航时，在很短的时间内，当第一个 viewController 分别消失和出现时，我会看到一个黑色的导航栏.我知道这是因为用 2nd viewController 编写的代码.但我没有任何其他解决方案可以做到这一点.附上截图:

The issue here is that when I navigate from and to the firstViewController, for a very short duration when the 1st viewController is disappearing and appearing respectively, I see a black nav bar on it. I know this is because of the code written in 2nd viewController. But I don't have any other close solution of doing this. Attaching a screenshot :

第一个 viewController(应该是怎样的):

第二个视图控制器:

第一个 viewController(带有短暂的黑色导航栏):

推荐答案

在First viewController中，同样设置backgroundImage和shadowImage的navigationBar 为 nil，即

In First viewController, also set the backgroundImage and shadowImage of navigationBar as nil, i.e.

class FirstVC: UIViewController
{
    override func viewWillAppear(_ animated: Bool)
    {
        super.viewWillAppear(animated)
        self.navigationController?.navigationBar.isTranslucent = true
        self.navigationController?.navigationBar.setBackgroundImage(nil, for: UIBarMetrics.default)
        self.navigationController?.navigationBar.shadowImage = nil
        self.navigationController?.navigationBar.barTintColor = .red
        self.navigationController?.navigationBar.tintColor = UIColor.white
        self.navigationController?.navigationBar.barStyle = .black
    }
}

class SecondVC: UIViewController
{
    override func viewWillAppear(_ animated: Bool)
    {
        super.viewWillAppear(animated)

        self.navigationController?.navigationBar.isTranslucent = true
        self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: UIBarMetrics.default)
        self.navigationController?.view.backgroundColor = UIColor.clear
        self.navigationController?.navigationBar.shadowImage = UIImage()
    }
}

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