import EachNavigationBar

let nav = UINavigationController(rootViewController: vc)
nav.navigation.configuration.isEnabled = true

nav.navigation.configuration.titleTextAttributes = [.foregroundColor: UIColor.blue]

nav.navigation.configuration.barTintColor = UIColor.red

nav.navigation.configuration.shadowImage = UIImage(named: "shadow")

nav.navigation.configuration.setBackgroundImage(UIImage(named: "nav"), for: .any, barMetrics: .default)

nav.navigation.configuration.backItem = UINavigationController.Configuration.BackItem(style: .title("返回"))

nav.navigation.configuration.prefersLargeTitles = true

nav.navigation.configuration.largeTitle.displayMode = .always

navigation.bar  -> EachNavigationBar -> UINavigationBar
navigation.item -> UINavigationItem

// hide navigation bar
navigation.bar.isHidden = true

// remove blur effect
navigation.bar.isTranslucent = false

// hides shadow image
navigation.bar.isShadowHidden = true

// set status bar style
navigation.bar.statusBarStyle = .lightContent

// if you want change navigation bar position
navigation.bar.automaticallyAdjustsPosition = false

// item padding
navigation.bar.layoutPaddings = UIEdgeInsets(top: 0, left: 8, bottom: 0, right: 8)

// shadow
navigation.bar.shadow = Shadow(
    color: UIColor.black.cgColor,
    opacity: 0.5,
    offset: CGSize(width: 0, height: 3)
)

// set bar alpha
navigation.bar.alpha = 0.5

// set title alpha
navigation.bar.setTitleAlpha(0.5)

// set barButtonItem alpha
navigation.bar.setTintAlpha(0.5)
// if barButtonItem is customView
navigation.item.leftBarButtonItem?.customView?.alpha = 0.5
// if barButtonItem customized tintColor
navigation.item.leftBarButtonItem?.tintColor = navigation.item.leftBarButtonItem?.tintColor?.withAlphaComponent(0.5)

// navigation bar additional height
navigation.bar.additionalHeight = 14

// navigation bar additional view
navigation.bar.additionalView = UIView()

// set back bar button item
navigation.bar.backBarButtonItem = .init(style: .title("Back"), tintColor: .red)

// allow back
navigation.bar.backBarButtonItem.shouldBack = { item in
    // do something
    return false
}

// handler before back
navigation.bar.backBarButtonItem.willBack = {
    // do something
}

// handler after back
navigation.bar.backBarButtonItem.didBack = {
    // do something
}

// enable
navigation.bar.prefersLargeTitles = true

// display mode
navigation.item.largeTitleDisplayMode = .always

// alpha
navigation.bar.setLargeTitleAlpha(0.5)