mirror of https://github.com/oxen-io/session-ios
Created a ScrollableLabelView component for the ConfirmationModal
Morgan Pretty
6 months ago
parent
0bb410d74d
commit
7bfc533882
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// Copyright © 2024 Rangeproof Pty Ltd. All rights reserved.
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import UIKit
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class ScrollableLabelView: UIView {
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private var oldSize: CGSize = .zero
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private var layoutLoopCounter: Int = 0
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var canScroll: Bool = false {
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didSet {
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guard canScroll != oldValue else { return }
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updateContentSizeIfNeeded()
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}
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}
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var font: UIFont {
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get { label.font }
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set { label.font = newValue }
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}
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var text: String? {
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get { label.text }
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set {
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guard label.text != newValue else { return }
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label.text = newValue
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updateContentSizeIfNeeded()
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}
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}
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var attributedText: NSAttributedString? {
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get { label.attributedText }
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set {
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guard label.attributedText != newValue else { return }
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label.attributedText = newValue
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updateContentSizeIfNeeded()
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}
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}
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var themeTextColor: ThemeValue? {
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get { label.themeTextColor }
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set { label.themeTextColor = newValue }
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}
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var textAlignment: NSTextAlignment {
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get { label.textAlignment }
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set { label.textAlignment = newValue }
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}
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var lineBreakMode: NSLineBreakMode {
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get { label.lineBreakMode }
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set { label.lineBreakMode = newValue }
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}
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var numberOfLines: Int {
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get { label.numberOfLines }
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set { label.numberOfLines = newValue }
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}
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var maxNumberOfLinesWhenScrolling: Int = 5 {
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didSet {
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guard maxNumberOfLinesWhenScrolling != oldValue else { return }
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updateContentSizeIfNeeded()
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}
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}
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// MARK: - Initialization
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init() {
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super.init(frame: .zero)
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setupViews()
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setupConstraints()
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}
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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// MARK: - UI Components
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private lazy var labelHeightAnchor: NSLayoutConstraint = label.set(.height, to: .height, of: scrollView).setting(isActive: false)
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private lazy var scrollViewHeightAnchor: NSLayoutConstraint = scrollView.set(.height, to: 0).setting(isActive: false)
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private let scrollView: UIScrollView = UIScrollView()
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private let label: UILabel = UILabel()
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// MARK: - Layout
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private func setupViews() {
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addSubview(scrollView)
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scrollView.addSubview(label)
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}
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private func setupConstraints() {
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scrollView.pin(to: self)
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label.setContentHugging(.vertical, to: .required)
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label.pin(to: scrollView)
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label.set(.width, to: .width, of: scrollView)
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}
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override func layoutSubviews() {
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super.layoutSubviews()
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guard frame.size != oldSize else {
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layoutLoopCounter = 0
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return
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}
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updateContentSizeIfNeeded()
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}
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private func updateContentSizeIfNeeded() {
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// Ensure we don't get stuck in an infinite layout loop somehow
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guard layoutLoopCounter < 5 else { return }
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// Update the contentSize of the scrollView to match the size of the label
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scrollView.contentSize = label.sizeThatFits(
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CGSize(width: scrollView.bounds.width, height: CGFloat.greatestFiniteMagnitude)
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)
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// If scrolling is enabled and the maximum height we want to show is smaller than the scrollable height
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// then we need to fix the height of the scroll view to our desired maximum, other
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let maxCalculatedHeight: CGFloat = (label.font.lineHeight * CGFloat(maxNumberOfLinesWhenScrolling))
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switch (canScroll, maxCalculatedHeight <= scrollView.contentSize.height) {
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case (false, _), (true, false):
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scrollViewHeightAnchor.isActive = false
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labelHeightAnchor.isActive = true
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case (true, true):
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labelHeightAnchor.isActive = false
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scrollViewHeightAnchor.constant = maxCalculatedHeight
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scrollViewHeightAnchor.isActive = true
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}
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oldSize = frame.size
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// The view should have the same height as the scrollView, if it doesn't then we might need to relayout
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// again to ensure the frame size is correct
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guard
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scrollView.frame.size.height < CGFloat.leastNonzeroMagnitude ||
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abs(frame.size.height - scrollView.frame.size.height) > CGFloat.leastNonzeroMagnitude
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else { return }
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layoutLoopCounter += 1
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setNeedsLayout()
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layoutIfNeeded()
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}
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}
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