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Semen Osipov
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Created bottom sheet controller
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‎.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata‎

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‎ARBottomSheetViewController.xcodeproj/project.pbxproj‎

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‎ARBottomSheetViewController.xcodeproj/project.xcworkspace/contents.xcworkspacedata‎

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‎ARBottomSheetViewController.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist‎

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>IDEDidComputeMac32BitWarning</key>
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<true/>
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</dict>
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</plist>

‎ARBottomSheetViewController.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved‎

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‎ARBottomSheetViewController/ARBottomSheetViewController.docc/ARBottomSheetViewController.md‎

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# ``ARBottomSheetViewController``
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iOS bottom sheet written on Swift

‎ARBottomSheetViewController/ARBottomSheetViewController.h‎

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//
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// ARBottomSheetViewController.h
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// ARBottomSheetViewController
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//
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// Created by Семён C. Осипов on 14.02.2024.
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//
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#import <Foundation/Foundation.h>
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//! Project version number for ARBottomSheetViewController.
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FOUNDATION_EXPORT double ARBottomSheetViewControllerVersionNumber;
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//! Project version string for ARBottomSheetViewController.
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FOUNDATION_EXPORT const unsigned char ARBottomSheetViewControllerVersionString[];
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// In this header, you should import all the public headers of your framework using statements like #import <ARBottomSheetViewController/PublicHeader.h>
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‎ARBottomSheetViewController/Sources/ARBottomSheetPresentationViewController.swift‎

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//
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// ARBottomSheetViewController.swift
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//
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//
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// Created by Семён C. Осипов on 14.02.2024.
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//
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import UIKit
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import SnapKit
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protocol ARBottomSheetPresentationViewControllerDelegate: AnyObject {
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var preferedControllerHeight: CGFloat {get}
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var interactionScrollView: UIScrollView? {get}
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}
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class ARBottomSheetPresentationViewController: UIPresentationController {
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private weak var customDelegate: ARBottomSheetPresentationViewControllerDelegate?
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private var originalY: CGFloat = 0
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private var controllerHeight: CGFloat?
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private var panGestureRecognizer: ARInitialTouchPanGestureRecognizer?
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private lazy var dimmingView: UIView = {
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let view = UIView()
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let recognizer = UITapGestureRecognizer(target: self,
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action: #selector(handleTap(recognizer:)))
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recognizer.delegate = self
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view.addGestureRecognizer(recognizer)
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return view
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}()
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init(presentedViewController: UIViewController,
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presenting presentingViewController: UIViewController?,
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height: CGFloat = UIScreen.main.bounds.height) {
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self.controllerHeight = height
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super.init(presentedViewController: presentedViewController,
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presenting: presentingViewController)
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}
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init(presentedViewController: UIViewController,
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presenting presentingViewController: UIViewController?,
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delegate: ARBottomSheetPresentationViewControllerDelegate) {
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super.init(presentedViewController: presentedViewController, presenting: presentingViewController)
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self.customDelegate = delegate
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}
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override func containerViewWillLayoutSubviews() {
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super.containerViewWillLayoutSubviews()
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presentedView?.frame = frameOfPresentedViewInContainerView
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}
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override var frameOfPresentedViewInContainerView: CGRect {
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guard let container = containerView else { return super.frameOfPresentedViewInContainerView }
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let width = container.bounds.size.width
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let preferedHeight: CGFloat = customDelegate?.preferedControllerHeight ?? controllerHeight ?? maxHeight()
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let height = min(preferedHeight, maxHeight())
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return CGRect(x: 0, y: container.bounds.size.height - height, width: width, height: height)
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}
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private func maxHeight() -> CGFloat {
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let screenHeight = UIScreen.main.bounds.height
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var topPadding: CGFloat = 0
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if let window = UIApplication.shared.windows.first {
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topPadding = window.safeAreaInsets.top
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}
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return screenHeight - topPadding
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}
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override func presentationTransitionWillBegin() {
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guard let containerView = containerView else { return }
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containerView.insertSubview(dimmingView, at: 0)
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let viewPan = ARInitialTouchPanGestureRecognizer(target: self, action: #selector(viewPanned(_:)))
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viewPan.delegate = self
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containerView.addGestureRecognizer(viewPan)
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panGestureRecognizer = viewPan
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if let panGestureRecognizer = panGestureRecognizer {
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customDelegate?.interactionScrollView?.panGestureRecognizer.require(toFail: panGestureRecognizer)
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}
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dimmingView.snp.makeConstraints {
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$0.top.bottom.leading.trailing.equalToSuperview()
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}
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dimmingView.backgroundColor = .black.withAlphaComponent(0)
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UIView.animate(withDuration: 0.25) {
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self.dimmingView.backgroundColor = .black.withAlphaComponent(0.5)
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}
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}
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override func dismissalTransitionWillBegin() {
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UIView.animate(withDuration: 0.25) {
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self.dimmingView.backgroundColor = .black.withAlphaComponent(0)
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}
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}
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// MARK: Gestures
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@objc private func viewPanned(_ sender: UIPanGestureRecognizer) {
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let translateY = sender.translation(in: presentedView).y
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let velocityY = sender.velocity(in: presentedView).y
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switch sender.state {
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case .began:
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originalY = presentedViewController.view.frame.origin.y
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case .changed:
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if translateY > 0 {
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presentedViewController.view.frame.origin.y = originalY + translateY
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} /*else {
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let diff = presentedViewController.view.frame.origin.y / presentingViewController.view.frame.size.height
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presentedView?.frame.origin.y = originalY + translateY * diff
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containerView?.layoutSubviews()
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}*/
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case .ended:
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let presentedViewHeight = presentedViewController.view.frame.height
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let newY = presentedViewController.view.frame.origin.y + velocityY * 0.2
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let isMoreHalfProgress = dimmingView.frame.height - presentedViewHeight * 0.5 < newY
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isMoreHalfProgress ? moveAndDismissPresentedView() : setBackToOriginalPosition()
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default:
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break
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}
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}
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@objc func handleTap(recognizer: UITapGestureRecognizer) {
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presentingViewController.dismiss(animated: true)
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}
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private func setBackToOriginalPosition() {
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presentedViewController.view.layoutIfNeeded()
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UIView.animate(withDuration: 0.25, delay: 0.0, options: .curveEaseInOut, animations: {
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self.presentedViewController.view.frame.origin.y = self.originalY
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self.presentedViewController.view.layoutIfNeeded()
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}, completion: nil)
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}
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private func moveAndDismissPresentedView() {
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presentedViewController.view.layoutIfNeeded()
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dismissalTransitionWillBegin()
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UIView.animate(withDuration: 0.25, delay: 0.0, options: .curveEaseIn, animations: {
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self.presentedViewController.view.frame.origin.y = self.dimmingView.frame.height
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self.presentedViewController.view.layoutIfNeeded()
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}, completion: { _ in
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self.presentingViewController.dismiss(animated: true, completion: nil)
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})
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}
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}
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extension ARBottomSheetPresentationViewController: UIGestureRecognizerDelegate {
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func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
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guard let panGestureRecognizer = gestureRecognizer as? ARInitialTouchPanGestureRecognizer else { return true }
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let velocity = panGestureRecognizer.velocity(in: presentedView)
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guard abs(velocity.y) > abs(velocity.x) else {return false}
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if let childScrollView = customDelegate?.interactionScrollView,
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let view = presentedView,
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let point = panGestureRecognizer.initialTouchLocation {
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let pointInChildScrollView = view.convert(point, to: childScrollView).y - childScrollView.contentOffset.y
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guard pointInChildScrollView > 0, pointInChildScrollView < childScrollView.bounds.height else {
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return true
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}
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let closeDirection = panGestureRecognizer.translation(in: presentedView).y > 0
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let contentOffset = childScrollView.contentOffset.y
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if closeDirection {
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return contentOffset <= -childScrollView.contentInset.top
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} else {
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return false
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/* let offset = contentOffset + childScrollView.bounds.height - childScrollView.contentInset.bottom
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let contentSize = childScrollView.contentSize.height.rounded(.toNearestOrAwayFromZero)
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return offset >= contentSize */
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}
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}
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return true
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}
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}

‎ARBottomSheetViewController/Sources/ARBottomSheetViewController.swift‎

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//
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// ARBottomSheetViewController.swift
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//
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//
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// Created by Семён C. Осипов on 14.02.2024.
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//
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import UIKit
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import SnapKit
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public protocol ARBottomSheetViewControllerDelegate: AnyObject {
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var contentHeight: CGFloat {get}
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var childScrollView: UIScrollView? {get}
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}
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public class ARBottomSheetViewController: UIViewController {
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public weak var sheetDelegate: ARBottomSheetViewControllerDelegate?
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// MARK: Views
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private let stickView: UIView = {
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let view = UIView()
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if #available(iOS 13.0, *) {
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view.backgroundColor = .label
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} else {
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view.backgroundColor = .black
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}
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view.snp.makeConstraints {
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$0.width.equalTo(65)
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$0.height.equalTo(5)
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}
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view.layer.cornerRadius = 2.5
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return view
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}()
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private let contentView: UIView = {
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let view = UIView()
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view.backgroundColor = .clear
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return view
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}()
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/**
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Add your content on this view
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*/
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public var contentBackgroundView: UIView {
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contentView
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}
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/**
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Init View controller
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*/
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public init() {
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super.init(nibName: nil, bundle: nil)
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commonInit()
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}
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required init?(coder: NSCoder) {
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super.init(coder: coder)
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commonInit()
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}
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private func commonInit() {
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modalPresentationStyle = .custom
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transitioningDelegate = self
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setupViews()
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view.clipsToBounds = true
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view.layer.cornerRadius = 30
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view.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
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if #available(iOS 13.0, *) {
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view.backgroundColor = .systemBackground
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} else {
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view.backgroundColor = .white
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}
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}
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private func setupViews() {
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view.addSubview(stickView)
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view.addSubview(contentView)
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stickView.snp.makeConstraints {
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$0.centerX.equalToSuperview()
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$0.top.equalToSuperview().inset(20)
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}
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contentView.snp.makeConstraints {
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$0.leading.trailing.bottom.equalToSuperview()
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$0.top.equalTo(stickView.snp.bottom).offset(20)
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}
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}
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}
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// MARK: - UIViewControllerTransitioningDelegate
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extension ARBottomSheetViewController: UIViewControllerTransitioningDelegate {
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public func presentationController(forPresented presented: UIViewController,
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presenting: UIViewController?,
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source: UIViewController) -> UIPresentationController? {
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return ARBottomSheetPresentationViewController(presentedViewController: presented,
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presenting: presenting,
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delegate: self)
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}
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}
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// MARK: - LRVBottomSheetPresentationViewControllerDelegate
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extension ARBottomSheetViewController: ARBottomSheetPresentationViewControllerDelegate {
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var interactionScrollView: UIScrollView? {
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return sheetDelegate?.childScrollView
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}
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var preferedControllerHeight: CGFloat {
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let stickSize: CGFloat = 5 + 20 + 20
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var bottomPadding: CGFloat = 0
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if let window = UIApplication.shared.windows.first {
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bottomPadding = window.safeAreaInsets.bottom
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}
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return stickSize + (sheetDelegate?.contentHeight ?? 0) + bottomPadding
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}
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}
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‎ARBottomSheetViewController/Sources/ARInitialTouchPanGestureRecognizer.swift‎

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//
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// ARInitialTouchPanGestureRecognizer.swift
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//
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//
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// Created by Семён C. Осипов on 14.02.2024.
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//
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import UIKit.UIGestureRecognizerSubclass
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class ARInitialTouchPanGestureRecognizer: UIPanGestureRecognizer {
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var initialTouchLocation: CGPoint?
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override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent) {
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super.touchesBegan(touches, with: event)
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initialTouchLocation = touches.first?.location(in: view)
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}
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}
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