83 lines
3.1 KiB
Swift
83 lines
3.1 KiB
Swift
//
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// Copyright 2022 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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//
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import UIKit
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open class MediaTopBar: UIView {
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// Custom layout guide is necessary to allow to adjust the top margin.
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// Usually one could just change layoutMargins.top but that approach
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// sometimes doesn't work for this view because top inset gets overridden by UIKit
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// since `preservesSuperviewLayoutMargins` is set to `true`.
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public let controlsLayoutGuide = UILayoutGuide()
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private lazy var controlsLayoutGuideTop: NSLayoutConstraint = {
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controlsLayoutGuide.topAnchor.constraint(equalTo: topAnchor)
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}()
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private lazy var controlsLayoutGuideLeading: NSLayoutConstraint = {
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controlsLayoutGuide.leadingAnchor.constraint(equalTo: layoutMarginsGuide.leadingAnchor)
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}()
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private lazy var controlsLayoutGuideTrailing: NSLayoutConstraint = {
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controlsLayoutGuide.trailingAnchor.constraint(equalTo: layoutMarginsGuide.trailingAnchor)
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}()
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override public init(frame: CGRect) {
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super.init(frame: frame)
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layoutMargins = .zero
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preservesSuperviewLayoutMargins = true
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installConstraints()
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}
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required public init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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private func installConstraints() {
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addLayoutGuide(controlsLayoutGuide)
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controlsLayoutGuideTop.isActive = true
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controlsLayoutGuideLeading.isActive = true
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controlsLayoutGuideTrailing.isActive = true
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controlsLayoutGuide.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
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}
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public override func updateConstraints() {
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super.updateConstraints()
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let isIPadUIInRegularMode = traitCollection.horizontalSizeClass == .regular && traitCollection.verticalSizeClass == .regular
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let horizontalMargin: CGFloat = isIPadUIInRegularMode ? 12 : 0
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let topMargin: CGFloat = {
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// Unnecessary, but looks better with some more padding on iPad screens.
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if isIPadUIInRegularMode {
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return 10
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}
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// iPhones in landscape mode.
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if traitCollection.verticalSizeClass == .compact {
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return 0
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}
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// iPhones with a screen notch, iPads in windowed mode.
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if UIDevice.current.hasIPhoneXNotch || UIDevice.current.isIPad {
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return 4
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}
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// iPhones with a home button have their status bar hidden (safeArea.top == 0)
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// so it's necessary to add some padding manually.
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return 16
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}()
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controlsLayoutGuideLeading.constant = horizontalMargin
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controlsLayoutGuideTrailing.constant = -horizontalMargin
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controlsLayoutGuideTop.constant = topMargin
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}
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public override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
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super.traitCollectionDidChange(previousTraitCollection)
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setNeedsUpdateConstraints()
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}
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public func install(in view: UIView) {
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view.addSubview(self)
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autoPinWidthToSuperview()
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autoPinEdge(toSuperviewSafeArea: .top)
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}
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}
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