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//
// CustomNavigationBar.swift
// MullvadVPN
//
// Created by pronebird on 22/05/2019.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import UIKit
extension UINavigationBar {
/// Locates the navigation bar prompt label within the view hirarchy and overrides the text color.
/// - Note: Navigation bar does not provide the appearance configuration for the prompt.
func overridePromptColor() {
let promptView = subviews.first { $0.description.contains("Prompt") }
let promptLabel = promptView?.subviews.first { $0 is UILabel } as? UILabel
promptLabel?.textColor = UIColor.NavigationBar.promptColor
}
func configureCustomAppeareance() {
var directionalMargins = directionalLayoutMargins
directionalMargins.leading = UIMetrics.largeNavigationTitlePadding.leading
directionalMargins.trailing = UIMetrics.largeNavigationTitlePadding.trailing
directionalLayoutMargins = directionalMargins
tintColor = UIColor.NavigationBar.titleColor
standardAppearance = makeNavigationBarAppearance(isTransparent: false)
scrollEdgeAppearance = makeNavigationBarAppearance(isTransparent: true)
}
private func makeNavigationBarAppearance(isTransparent: Bool) -> UINavigationBarAppearance {
let backIndicatorImage = UIImage.Buttons.back.withTintColor(
UIColor.NavigationBar.buttonColor,
renderingMode: .alwaysOriginal
)
let backIndicatorTransitionMask = UIImage.backTransitionMask
let titleTextAttributes: [NSAttributedString.Key: Any] = [
.foregroundColor: UIColor.NavigationBar.titleColor
]
let backButtonTitlePositionOffset = UIOffset(horizontal: 4, vertical: 0)
let backButtonTitleTextAttributes: [NSAttributedString.Key: Any] = [
.foregroundColor: UIColor.NavigationBar.backButtonTitleColor
]
let navigationBarAppearance = UINavigationBarAppearance()
if isTransparent {
navigationBarAppearance.configureWithTransparentBackground()
} else {
navigationBarAppearance.configureWithDefaultBackground()
navigationBarAppearance.backgroundEffect = UIBlurEffect(style: .dark)
}
navigationBarAppearance.titleTextAttributes = titleTextAttributes
navigationBarAppearance.largeTitleTextAttributes = titleTextAttributes
let plainBarButtonAppearance = UIBarButtonItemAppearance(style: .plain)
plainBarButtonAppearance.normal.titleTextAttributes = titleTextAttributes
let doneBarButtonAppearance = UIBarButtonItemAppearance(style: .done)
doneBarButtonAppearance.normal.titleTextAttributes = titleTextAttributes
let backButtonAppearance = UIBarButtonItemAppearance(style: .plain)
backButtonAppearance.normal.titlePositionAdjustment = backButtonTitlePositionOffset
backButtonAppearance.normal.titleTextAttributes = backButtonTitleTextAttributes
navigationBarAppearance.buttonAppearance = plainBarButtonAppearance
navigationBarAppearance.doneButtonAppearance = doneBarButtonAppearance
navigationBarAppearance.backButtonAppearance = backButtonAppearance
navigationBarAppearance.setBackIndicatorImage(
backIndicatorImage,
transitionMaskImage: backIndicatorTransitionMask
)
return navigationBarAppearance
}
}
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