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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,196 @@ | ||
| // | ||
| // UIBottomSheet+.swift | ||
| // KkuMulKum | ||
| // | ||
| // Created by 이지훈 on 8/14/24. | ||
| //// ref: https://velog.io/@minsang/iOS-Bottom-Sheet | ||
|
|
||
| import UIKit | ||
| import SnapKit | ||
| import Then | ||
|
|
||
| enum BottomSheetViewState { | ||
| case expanded | ||
| case normal | ||
| } | ||
|
|
||
| class BottomSheetViewController: BaseViewController { | ||
| private lazy var dimmedView = UIView().then { | ||
| $0.backgroundColor = UIColor.darkGray.withAlphaComponent(self.dimmedAlpha) | ||
| $0.alpha = 0 | ||
| } | ||
|
|
||
| private lazy var bottomSheetView = UIView().then { | ||
| $0.backgroundColor = .white | ||
| $0.layer.cornerRadius = self.cornerRadius | ||
| $0.layer.cornerCurve = .continuous | ||
| $0.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner] | ||
| $0.clipsToBounds = true | ||
| } | ||
|
|
||
| private let dragIndicatorView = UIView().then { | ||
| $0.backgroundColor = .black | ||
| $0.tintColor = .black | ||
| $0.layer.cornerRadius = 1.5 | ||
| $0.alpha = 0 | ||
| } | ||
|
|
||
| let defaultHeight: CGFloat | ||
| // bottomSheetView의 상단 CornerRadius 값 | ||
| let cornerRadius: CGFloat | ||
| // dimmedView의 alpha값 | ||
| let dimmedAlpha: CGFloat | ||
| // pannedGesture 활성화 여부 | ||
| let isPannedable: Bool | ||
|
|
||
| // Bottom Sheet과 safe Area Top 사이의 최소값을 지정하기 위한 프로퍼티 | ||
| private let bottomSheetPanMinTopConstant: CGFloat = 40 | ||
| // 드래그 하기 전에 Bottom Sheet의 top Constraint value를 저장하기 위한 프로퍼티 | ||
| private lazy var bottomSheetPanStartingTopConstant: CGFloat = bottomSheetPanMinTopConstant | ||
|
|
||
| private let contentViewController: UIViewController | ||
|
|
||
| init( | ||
| contentViewController: UIViewController, | ||
| defaultHeight: CGFloat, | ||
| cornerRadius: CGFloat = 8, | ||
| dimmedAlpha: CGFloat = 0.6, | ||
| isPannedable: Bool = false | ||
| ) { | ||
| self.contentViewController = contentViewController | ||
| self.defaultHeight = defaultHeight | ||
| self.cornerRadius = cornerRadius | ||
| self.dimmedAlpha = dimmedAlpha | ||
| self.isPannedable = isPannedable | ||
|
|
||
| super.init(nibName: nil, bundle: nil) | ||
| self.modalPresentationStyle = .overFullScreen | ||
| } | ||
|
|
||
| required init?(coder: NSCoder) { | ||
| fatalError("init(coder:) has not been implemented") | ||
| } | ||
|
|
||
| override func viewDidLoad() { | ||
| super.viewDidLoad() | ||
|
|
||
| self.configureUI() | ||
| self.configureLayout() | ||
| self.configureDimmedTapGesture() | ||
| self.dragIndicatorView.alpha = 1 | ||
| self.bottomSheetView.transform = CGAffineTransform(translationX: 0, y: self.defaultHeight) | ||
| } | ||
|
|
||
| override func viewDidAppear(_ animated: Bool) { | ||
| super.viewDidAppear(animated) | ||
| self.showBottomSheet() | ||
| } | ||
|
|
||
| override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) { | ||
| super.viewWillTransition(to: size, with: coordinator) | ||
| coordinator.animate { [weak self] _ in | ||
| self?.showBottomSheet() | ||
| } | ||
| } | ||
|
|
||
| override func setupView() { | ||
| super.setupView() | ||
|
|
||
| view.backgroundColor = .clear | ||
| configureUI() | ||
| configureLayout() | ||
| self.dragIndicatorView.alpha = 1 | ||
| self.bottomSheetView.transform = CGAffineTransform(translationX: 0, y: self.defaultHeight) | ||
| } | ||
|
|
||
| private func configureUI() { | ||
| view.addSubviews(dimmedView, bottomSheetView, dragIndicatorView) | ||
| addChild(contentViewController) | ||
| bottomSheetView.addSubview(contentViewController.view) | ||
| bottomSheetView.addSubview(dragIndicatorView) | ||
| contentViewController.didMove(toParent: self) | ||
| dragIndicatorView.backgroundColor = .black | ||
| } | ||
|
|
||
| private func showBottomSheet(atState: BottomSheetViewState = .normal) { | ||
| let screenHeight: CGFloat = view.frame.height | ||
|
|
||
| if atState == .normal { | ||
| bottomSheetView.snp.updateConstraints { | ||
| $0.height.equalTo(defaultHeight) | ||
| } | ||
| } else { | ||
| bottomSheetView.snp.updateConstraints { | ||
| $0.height.equalTo(screenHeight - bottomSheetPanMinTopConstant) | ||
| } | ||
| } | ||
|
|
||
| UIView.animate(withDuration: 0.25, delay: 0, options: .curveEaseOut, animations: { | ||
| self.dimmedView.alpha = self.dimmedAlpha | ||
| self.bottomSheetView.transform = .identity | ||
| self.view.layoutIfNeeded() | ||
| }, completion: nil) | ||
| } | ||
|
|
||
| } | ||
|
|
||
| // MARK: Configure | ||
| extension BottomSheetViewController { | ||
| private func configureLayout() { | ||
| dimmedView.snp.makeConstraints { | ||
| $0.edges.equalToSuperview() | ||
| } | ||
|
|
||
| bottomSheetView.snp.makeConstraints { | ||
| $0.leading.trailing.bottom.equalTo(view.safeAreaLayoutGuide) | ||
| $0.bottom.equalToSuperview() | ||
| $0.height.equalTo(defaultHeight) | ||
| } | ||
|
|
||
| contentViewController.view.snp.makeConstraints { | ||
| $0.edges.equalToSuperview() | ||
| } | ||
|
|
||
| dragIndicatorView.snp.makeConstraints { | ||
| $0.width.equalTo(60) | ||
| $0.height.equalTo(3) | ||
| $0.centerX.equalTo(view.safeAreaLayoutGuide) | ||
| $0.bottom.equalTo(bottomSheetView.snp.top).offset(12) | ||
| } | ||
| } | ||
|
|
||
| private func configureDimmedTapGesture() { | ||
| let dimmedTap = UITapGestureRecognizer(target: self, action: #selector(dimmedViewTapped(_:))) | ||
| dimmedView.addGestureRecognizer(dimmedTap) | ||
| dimmedView.isUserInteractionEnabled = true | ||
| } | ||
| } | ||
|
|
||
| // MARK: Gesture | ||
| extension BottomSheetViewController { | ||
| @objc private func dimmedViewTapped(_ tapRecognizer: UITapGestureRecognizer) { | ||
| self.hideBottomSheetAndGoBack() | ||
| } | ||
| } | ||
|
|
||
| extension BottomSheetViewController { | ||
| private func hideBottomSheetAndGoBack() { | ||
| let hideTransform = CGAffineTransform(translationX: 0, y: self.defaultHeight) | ||
|
|
||
| UIView.animate(withDuration: 0.25, delay: 0, options: .curveEaseIn, animations: { | ||
| self.dimmedView.alpha = 0.0 | ||
| self.bottomSheetView.transform = hideTransform | ||
| self.view.layoutIfNeeded() | ||
| }) { _ in | ||
| if self.presentingViewController != nil { | ||
| self.dismiss(animated: false, completion: nil) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private func nearest(to number: CGFloat, inValues values: [CGFloat]) -> CGFloat { | ||
| guard let nearestVal = values.min(by: { abs(number - $0) < abs(number - $1) }) | ||
| else { return number } | ||
| return nearestVal | ||
| } | ||
| } |
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