ios - NavigationBar 改变颜色本身

Question

我有 2 个 VC。在这两种情况下，我都将代码编写为 NavigationController 外观，但是当我从第二个 VC 返回到第一个时，我的一切都是黑色的......

第一位风投:

override func viewDidLoad() {
        super.viewDidLoad()

        self.navigationController?.navigationBar.isTranslucent = true
        self.navigationController?.navigationBar.barTintColor = UIColor.white
        self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.black]
        self.navigationController?.navigationBar.largeTitleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.black]
        self.navigationController?.navigationBar.tintColor = UIColor.init(red:47/255.0, green:158/255.0, blue:249/255.0, alpha: 1.0)
}

第二个风投:

self.navigationController?.navigationBar.isTranslucent = false
        self.navigationController?.navigationBar.barTintColor = UIColor.black
        self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white]
        self.navigationController?.navigationBar.largeTitleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white]
        self.navigationController?.navigationBar.tintColor = UIColor.white

那么为什么当我回到第一个 VC 时它不从 viewDidLoad 加载颜色？

Answer 1

因为您的第一个 ViewController 已经加载，所以将您的导航栏设置放在 viewWillAppear

override func viewWillAppear() {
    super. viewWillAppear()

    self.navigationController?.navigationBar.isTranslucent = true
    self.navigationController?.navigationBar.barTintColor = UIColor.white
    self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.black]
    self.navigationController?.navigationBar.largeTitleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.black]
    self.navigationController?.navigationBar.tintColor = UIColor.init(red:47/255.0, green:158/255.0, blue:249/255.0, alpha: 1.0)
}