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//
// CustomSplitViewController.swift
// MullvadVPN
//
// Created by pronebird on 07/04/2021.
// Copyright © 2021 Mullvad VPN AB. All rights reserved.
//
import UIKit
class CustomSplitViewController: UISplitViewController, RootContainment {
var preferredHeaderBarPresentation: HeaderBarPresentation {
for case let viewController as RootContainment in viewControllers {
return viewController.preferredHeaderBarPresentation
}
return .default
}
var prefersHeaderBarHidden: Bool {
for case let viewController as RootContainment in viewControllers {
return viewController.prefersHeaderBarHidden
}
return false
}
var dividerColor: UIColor? {
didSet {
if isViewLoaded {
self.updateDividerColor()
}
}
}
override var childForStatusBarStyle: UIViewController? {
if #available(iOS 13, *) {
return super.childForStatusBarStyle
} else {
return viewControllers.last
}
}
override var childForStatusBarHidden: UIViewController? {
if #available(iOS 13, *) {
return super.childForStatusBarHidden
} else {
return viewControllers.last
}
}
override var shouldAutomaticallyForwardAppearanceMethods: Bool {
// iOS 12: force split view controller to forward appearance events.
return true
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
updateDividerColor()
}
private var dividerView: UIView? {
let subviews = view.subviews.flatMap { (view) -> [UIView] in
return [view] + view.subviews
}
return subviews.first { (view) -> Bool in
return view.description.hasPrefix("<UIPanelBorderView")
}
}
private func updateDividerColor() {
guard let dividerColor = dividerColor else { return }
dividerView?.backgroundColor = dividerColor
}
override func overrideTraitCollection(forChild childViewController: UIViewController) -> UITraitCollection? {
guard let traitCollection = super.overrideTraitCollection(forChild: childViewController) else { return nil }
// Pass the split controller's horizontal size class to the primary controller when split
// view is expanded.
if !self.isCollapsed, childViewController == self.viewControllers.last {
let sizeOverrideTraitCollection = UITraitCollection(horizontalSizeClass: self.traitCollection.horizontalSizeClass)
return UITraitCollection(traitsFrom: [traitCollection, sizeOverrideTraitCollection])
} else {
return traitCollection
}
}
}
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