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//
// CustomNavigationBar.swift
// MullvadVPN
//
// Created by pronebird on 22/05/2019.
// Copyright © 2019 Mullvad VPN AB. All rights reserved.
//
import UIKit
class CustomNavigationBar: UINavigationBar {
private static let titleTextAttributes: [NSAttributedString.Key: Any] = [
.foregroundColor: UIColor.NavigationBar.titleColor
]
private static let backButtonTitlePositionOffset = UIOffset(horizontal: 4, vertical: 0)
private static let backButtonTitleTextAttributes: [NSAttributedString.Key: Any] = [
.foregroundColor: UIColor.NavigationBar.backButtonTitleColor
]
private static let setupAppearanceForIOS12Once: Void = {
if #available(iOS 13, *) {
// no-op
} else {
let buttonAppearance = UIBarButtonItem.appearance(whenContainedInInstancesOf: [CustomNavigationBar.self])
buttonAppearance.setBackButtonTitlePositionAdjustment(CustomNavigationBar.backButtonTitlePositionOffset, for: .default)
buttonAppearance.setTitleTextAttributes(CustomNavigationBar.titleTextAttributes, for: .normal)
}
}()
private let customBackIndicatorImage = UIImage(named: "IconBack")?
.backport_withTintColor(UIColor.NavigationBar.backButtonIndicatorColor, renderingMode: .alwaysOriginal)
private let customBackIndicatorTransitionMask = UIImage(named: "IconBackTransitionMask")
// Returns the distance from the title label to the bottom of navigation bar
var titleLabelBottomInset: CGFloat {
// Go two levels deep only
let subviewsToExamine = subviews.flatMap { (view) -> [UIView] in
return [view] + view.subviews
}
let titleLabel = subviewsToExamine.first { (view) -> Bool in
return view is UILabel
}
if let titleLabel = titleLabel {
let titleFrame = titleLabel.convert(titleLabel.bounds, to: self)
return max(bounds.maxY - titleFrame.maxY, 0)
} else {
return 0
}
}
override init(frame: CGRect) {
Self.setupAppearanceForIOS12Once
super.init(frame: frame)
var margins = layoutMargins
margins.left = UIMetrics.contentLayoutMargins.left
margins.right = UIMetrics.contentLayoutMargins.right
layoutMargins = margins
setupNavigationBarAppearance()
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
private func setupNavigationBarAppearance() {
tintColor = UIColor.NavigationBar.titleColor
backgroundColor = UIColor.NavigationBar.backgroundColor
isTranslucent = false
if #available(iOS 13, *) {
standardAppearance = makeNavigationBarAppearance()
scrollEdgeAppearance = makeNavigationBarAppearance()
} else {
backIndicatorImage = customBackIndicatorImage
backIndicatorTransitionMaskImage = customBackIndicatorTransitionMask
barTintColor = UIColor.NavigationBar.backgroundColor
titleTextAttributes = Self.titleTextAttributes
largeTitleTextAttributes = Self.titleTextAttributes
shadowImage = UIImage()
}
}
@available(iOS 13, *)
private func makeNavigationBarAppearance() -> UINavigationBarAppearance {
let navigationBarAppearance = UINavigationBarAppearance()
navigationBarAppearance.configureWithTransparentBackground()
navigationBarAppearance.titleTextAttributes = Self.titleTextAttributes
navigationBarAppearance.largeTitleTextAttributes = Self.titleTextAttributes
let plainBarButtonAppearance = UIBarButtonItemAppearance(style: .plain)
plainBarButtonAppearance.normal.titleTextAttributes = Self.titleTextAttributes
let doneBarButtonAppearance = UIBarButtonItemAppearance(style: .done)
doneBarButtonAppearance.normal.titleTextAttributes = Self.titleTextAttributes
let backButtonAppearance = UIBarButtonItemAppearance(style: .plain)
backButtonAppearance.normal.titlePositionAdjustment = Self.backButtonTitlePositionOffset
backButtonAppearance.normal.titleTextAttributes = Self.backButtonTitleTextAttributes
navigationBarAppearance.buttonAppearance = plainBarButtonAppearance
navigationBarAppearance.doneButtonAppearance = doneBarButtonAppearance
navigationBarAppearance.backButtonAppearance = backButtonAppearance
if #available(iOS 14, *) {
navigationBarAppearance.setBackIndicatorImage(customBackIndicatorImage, transitionMaskImage: customBackIndicatorTransitionMask)
} else {
// Bug: on iOS 13 setBackIndicatorImage accepts parameters in backward order
// https://stackoverflow.com/a/58171229/351305
navigationBarAppearance.setBackIndicatorImage(customBackIndicatorTransitionMask, transitionMaskImage: customBackIndicatorImage)
}
return navigationBarAppearance
}
}
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