121 lines
4.6 KiB
Swift
121 lines
4.6 KiB
Swift
// Copyright © 2022 Rangeproof Pty Ltd. All rights reserved.
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import UIKit
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import SessionUIKit
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import SessionUtilitiesKit
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public extension UIViewController {
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func findFrontmostViewController(ignoringAlerts: Bool) -> UIViewController {
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var visitedViewControllers: [UIViewController] = []
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var viewController: UIViewController = self
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while true {
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visitedViewControllers.append(viewController)
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var nextViewController: UIViewController? = viewController.presentedViewController
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if
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let topBannerController: TopBannerController = nextViewController as? TopBannerController,
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!topBannerController.children.isEmpty
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{
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nextViewController = (
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topBannerController.children[0].presentedViewController ??
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topBannerController.children[0]
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)
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}
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if let nextViewController: UIViewController = nextViewController {
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if !ignoringAlerts || !(nextViewController is UIAlertController) {
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if visitedViewControllers.contains(nextViewController) {
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// Cycle detected
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return viewController
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}
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viewController = nextViewController
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continue
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}
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}
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if let navController: UINavigationController = viewController as? UINavigationController {
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nextViewController = navController.topViewController
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if let nextViewController: UIViewController = nextViewController {
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if !ignoringAlerts || !(nextViewController is UIAlertController) {
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if visitedViewControllers.contains(nextViewController) {
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// Cycle detected
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return viewController
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}
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viewController = nextViewController
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continue
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}
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}
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break
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}
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break
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}
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return viewController
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}
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func createOWSBackButton() -> UIBarButtonItem {
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return UIViewController.createOWSBackButton(target: self, selector: #selector(backButtonPressed))
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}
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static func createOWSBackButton(target: Any?, selector: Selector) -> UIBarButtonItem {
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let backButton: UIButton = UIButton(type: .custom)
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let isRTL: Bool = CurrentAppContext().isRTL
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// Nudge closer to the left edge to match default back button item.
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let extraLeftPadding: CGFloat = (isRTL ? 0 : -8)
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// Give some extra hit area to the back button. This is a little smaller
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// than the default back button, but makes sense for our left aligned title
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// view in the MessagesViewController
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let extraRightPadding: CGFloat = (isRTL ? -0 : 10)
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// Extra hit area above/below
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let extraHeightPadding: CGFloat = 8
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// Matching the default backbutton placement is tricky.
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// We can't just adjust the imageEdgeInsets on a UIBarButtonItem directly,
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// so we adjust the imageEdgeInsets on a UIButton, then wrap that
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// in a UIBarButtonItem.
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backButton.addTarget(target, action: selector, for: .touchUpInside)
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let config: UIImage.Configuration = UIImage.SymbolConfiguration(pointSize: 22, weight: .medium)
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backButton.setImage(
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UIImage(systemName: "chevron.backward", withConfiguration: config)?
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.withRenderingMode(.alwaysTemplate),
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for: .normal
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)
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backButton.themeTintColor = .textPrimary
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backButton.contentHorizontalAlignment = .left
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backButton.imageEdgeInsets = UIEdgeInsets(top: 0, leading: extraLeftPadding, bottom: 0, trailing: 0)
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backButton.frame = CGRect(
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x: 0,
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y: 0,
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width: ((backButton.image(for: .normal)?.size.width ?? 0) + extraRightPadding),
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height: ((backButton.image(for: .normal)?.size.height ?? 0) + extraHeightPadding)
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)
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let backItem: UIBarButtonItem = UIBarButtonItem(
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customView: backButton,
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accessibilityIdentifier: "\(type(of: self)).back"
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)
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backItem.width = backButton.frame.width
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return backItem;
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}
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// MARK: - Event Handling
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@objc func backButtonPressed() {
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self.navigationController?.popViewController(animated: true)
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}
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}
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