【发布时间】:2021-12-27 10:57:34
【问题描述】:
我想根据屏幕内容更改状态栏样式。对于较暗的屏幕,状态栏内容应为白色。对于较亮的屏幕,状态栏内容应为黑色。
这个问题似乎只出现在 iOS 15 设备上。
下面的屏幕截图比较了 iOS 15.2 和 iOS 14.5 上的相同用例
如您所见,即使导航栏样式设置为“黑色”,状态栏样式也是默认的
class ViewAController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// setup views ...
}
// setting navigation bar style doesn't work iOS 15. Needed to set UINavigationAppearance()
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.navigationBar.barTintColor = .white
self.navigationController?.navigationBar.barStyle = .default
self.navigationController?.navigationBar.titleTextAttributes = [.font: UIFont.boldSystemFont(ofSize: 18), .foregroundColor: UIColor.black]
if #available(iOS 15, *) {
let appearance = UINavigationBarAppearance()
appearance.configureWithOpaqueBackground()
appearance.backgroundColor = .white
appearance.shadowImage = UIImage()
appearance.shadowColor = .clear
appearance.titleTextAttributes = [.font: UIFont.boldSystemFont(ofSize: 18), .foregroundColor: UIColor.black]
self.navigationItem.standardAppearance = appearance
self.navigationItem.scrollEdgeAppearance = appearance
}
}
@objc private func onClick(_ sender: UIButton) {
let vc = ViewBViewController()
self.show(vc, sender: self)
}
}
class ViewBViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
self.navigationItem.title = "View B"
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.navigationBar.isTranslucent = false
self.navigationController?.navigationBar.barTintColor = .black
self.navigationController?.navigationBar.barStyle = .black
self.navigationController?.navigationBar.titleTextAttributes = [.font: UIFont.boldSystemFont(ofSize: 18), .foregroundColor: UIColor.white]
// setting navigation bar style doesn't work iOS 15. Needed to set UINavigationAppearance()
if #available(iOS 15, *) {
let appearance = UINavigationBarAppearance()
appearance.configureWithOpaqueBackground()
appearance.backgroundColor = .black
appearance.shadowImage = UIImage()
appearance.shadowColor = .clear
appearance.titleTextAttributes = [.font: UIFont.boldSystemFont(ofSize: 18), .foregroundColor: UIColor.white]
self.navigationItem.standardAppearance = appearance
self.navigationItem.scrollEdgeAppearance = appearance
}
}
}
【问题讨论】:
-
覆盖 var preferredStatusBarStyle: UIStatusBarStyle { .lightContent }
-
导航栏样式是死信。它不再重要,也可能不存在。这是因为状态栏内容主要响应用户风格(浅色模式或深色模式)。
-
@BenRockey 当 VC 使用 UINavigationController 包装时它不起作用。如果 VC 在 Navigation Controller 中,设置 preferredStatusBarStyle 不会改变状态栏样式。
-
@matt 有没有我在不设置 barStyle 的情况下更改状态栏主题?我已经尝试过preferredStatusBarStyle,如果VCs被包裹在UINavigationController中,它就不起作用了。
-
一个常见的策略是继承 UINavigationController 以便它咨询顶视图控制器。
标签: swift uinavigationcontroller uikit ios15 uinavigationbarappearance