[英]iOS 11 custom navigation bar gives two bars
當我嘗試向這樣的視圖控制器添加自定義UINavigationBar時
class ViewController: UIViewController
{
static let nav_bar_height: CGFloat = 64
let nav_bar: UINavigationBar =
{
let nav_bar = UINavigationBar()
nav_bar.translatesAutoresizingMaskIntoConstraints = false
nav_bar.backgroundColor = .blue
return nav_bar
}()
override func viewDidLoad()
{
super.viewDidLoad()
view.backgroundColor = .yellow
view.addSubview(nav_bar)
nav_bar.heightAnchor.constraint(equalToConstant: ViewController.nav_bar_height).isActive = true
nav_bar.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
nav_bar.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
nav_bar.widthAnchor.constraint(equalToConstant: UIScreen.main.bounds.width).isActive = true
}
}
是否知道為什么白色的條形高度較小?
這是AppDelegate
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
window = UIWindow(frame: UIScreen.main.bounds)
window?.makeKeyAndVisible()
let vc = ViewController()
window?.rootViewController = vc
// Override point for customization after application launch.
return true
}...
您可能處於導航界面中,並且UINavigationController作為視圖控制器的父級。
因此,第二個導航欄是UINavigationController的導航欄。
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