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//
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// RouteComposer
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// SplitControllerAdapter.swift
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// https://github.com/ekazaev/route-composer
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//
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// Created by Eugene Kazaev in 2018-2022.
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// Distributed under the MIT license.
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//
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// Become a sponsor:
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// https://github.com/sponsors/ekazaev
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//
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import Foundation
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import UIKit
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/// Default `ContainerAdapter` for `UISplitViewController`
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public struct SplitControllerAdapter<VC: UISplitViewController>: ConcreteContainerAdapter {
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// MARK: Properties
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weak var splitViewController: VC?
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// MARK: Methods
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public init(with splitViewController: VC) {
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self.splitViewController = splitViewController
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}
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public var containedViewControllers: [UIViewController] {
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splitViewController?.viewControllers ?? []
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}
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/// ###NB
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/// `UISplitViewController` does not support showing primary view controller overlay programmatically out of the box in `primaryOverlay`
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/// mode. So all the contained view controllers are considered as visible in the default implementation.
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public var visibleViewControllers: [UIViewController] {
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containedViewControllers
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}
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/// ###NB
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/// `UISplitViewController` does not support showing primary view controller overlay programmatically out of the box in `primaryOverlay`
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/// mode, so default implementation of `makeVisible` method wont be able to serve it.
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public func makeVisible(_ viewController: UIViewController, animated: Bool, completion: @escaping (_: RoutingResult) -> Void) {
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guard splitViewController != nil else {
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completion(.failure(RoutingError.compositionFailed(.init("\(String(describing: VC.self)) has been deallocated"))))
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return
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}
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guard contains(viewController) else {
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completion(.failure(RoutingError.compositionFailed(.init("\(String(describing: splitViewController)) does not contain \(String(describing: viewController))"))))
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return
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}
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completion(.success)
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}
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/// Replacing of the child view controllers is not fully supported by the implementation of `UISplitViewController`.
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/// Only some common cases are covered by this method.
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///
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/// ###NB
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/// [https://developer.apple.com/documentation/uikit/uisplitviewcontroller](https://developer.apple.com/documentation/uikit/uisplitviewcontroller):
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/// **Quote:** When designing your split view interface, it is best to install primary and secondary view controllers that do not change.
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/// A common technique is to install navigation controllers in both positions and then push and pop new content as needed.
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public func setContainedViewControllers(_ containedViewControllers: [UIViewController], animated: Bool, completion: @escaping (_: RoutingResult) -> Void) {
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guard let splitViewController else {
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completion(.failure(RoutingError.compositionFailed(.init("\(String(describing: VC.self)) has been deallocated"))))
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return
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}
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if containedViewControllers.count > 1,
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let primaryViewController = self.containedViewControllers.first,
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primaryViewController === containedViewControllers.first,
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let detailsViewController = containedViewControllers.last {
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splitViewController.showDetailViewController(detailsViewController, sender: self)
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} else {
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splitViewController.viewControllers = containedViewControllers
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}
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completion(.success)
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}
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}
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