91 lines
3.4 KiB
Swift
91 lines
3.4 KiB
Swift
//
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// Copyright 2024 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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//
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import SignalServiceKit
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import Combine
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/// An interactive sheet view controller with stack view content. Automatically
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/// resizes the sheet and enables/disables scrolling based on content size.
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///
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/// To use, set `contentStackView`'s `spacing` and `alignment`, and add your
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/// content as arranged subviews. Optionally override `stackViewInsets` and/or
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/// `minimumBottomInsetIncludingSafeArea`.
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open class StackSheetViewController: InteractiveSheetViewController {
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public override var interactiveScrollViews: [UIScrollView] { [contentScrollView] }
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private var sizeChangeSubscription: AnyCancellable?
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/// Margins for the content in the stack view. The safe area insets for the
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/// bottom will be added to the value specified here. To set a minimum
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/// bottom inset, see ``minimumBottomInsetIncludingSafeArea``.
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///
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/// Default value is 24 on all sides.
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open var stackViewInsets: UIEdgeInsets {
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.init(margin: 24)
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}
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/// The minimum inset for the bottom of the stack view, including the safe area.
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///
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/// For example, if `stackViewInsets.bottom` is set to 20 and
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/// `minimumBottomInsetIncludingSafeArea` is set to 32, a device with a
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/// 40-pt bottom safe area inset will have a total bottom margin of
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/// 40+20 = 60, which is over the minimum. A device with no bottom safe area
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/// inset will use the minimum-specified bottom inset of 32.
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///
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/// Default value is 0.
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open var minimumBottomInsetIncludingSafeArea: CGFloat { 0 }
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private let contentScrollView = UIScrollView()
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/// The stack view to add your main content to.
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/// Recommended to set a custom `spacing` and `alignment`.
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public lazy var stackView: UIStackView = {
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let stackView = UIStackView()
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stackView.axis = .vertical
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stackView.isLayoutMarginsRelativeArrangement = true
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return stackView
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}()
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open override func viewDidLoad() {
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super.viewDidLoad()
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allowsExpansion = false
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contentView.addSubview(contentScrollView)
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contentScrollView.autoPinEdgesToSuperviewEdges()
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contentScrollView.addSubview(stackView)
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stackView.autoPinEdgesToSuperviewEdges()
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stackView.autoPinWidth(toWidthOf: contentView)
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stackView.preservesSuperviewLayoutMargins = true
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sizeChangeSubscription = stackView
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.publisher(for: \.bounds)
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.removeDuplicates()
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.sink { [weak self] bounds in
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guard let self else { return }
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let totalHandleHeight = Constants.handleSize.height + Constants.handleInsideMargin * 2
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let desiredHeight = bounds.height + totalHandleHeight
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self.minimizedHeight = desiredHeight
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self.contentScrollView.isScrollEnabled = self.maxHeight < desiredHeight
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}
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}
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open override func viewSafeAreaInsetsDidChange() {
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super.viewSafeAreaInsetsDidChange()
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let desiredInsets = self.stackViewInsets
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let bottomMargin = max(
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contentScrollView.safeAreaInsets.bottom + desiredInsets.bottom, minimumBottomInsetIncludingSafeArea
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)
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contentScrollView.layoutMargins = .init(
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top: desiredInsets.top,
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leading: desiredInsets.leading,
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bottom: bottomMargin,
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trailing: desiredInsets.trailing
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)
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}
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}
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