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@ -3,20 +3,21 @@
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import UIKit
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import SessionUIKit
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final class PagedScrollView: UIView, UIScrollViewDelegate {
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final class SessionLabelCarouselView: UIView, UIScrollViewDelegate {
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private static let autoScrollingTimeInterval: TimeInterval = 10
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private var slides: [UIView] = []
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private var slideSize: CGSize = .zero
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private var labelStrings: [NSAttributedString] = []
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private var labelSize: CGSize = .zero
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private var shouldAutoScroll: Bool = false
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private var timer: Timer?
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private lazy var contentWidth = stackView.set(.width, to: 0)
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private lazy var contentHeight = stackView.set(.height, to: 0)
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private var shouldArrowsShow: Bool = false {
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private var shouldScroll: Bool = false {
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didSet {
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arrowLeft.isHidden = !shouldArrowsShow
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arrowRight.isHidden = !shouldArrowsShow
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arrowLeft.isHidden = !shouldScroll
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arrowRight.isHidden = !shouldScroll
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pageControl.isHidden = !shouldScroll
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}
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}
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@ -67,10 +68,10 @@ final class PagedScrollView: UIView, UIScrollViewDelegate {
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// MARK: - Initialization
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init(slides: [UIView] = [], slideSize: CGSize = .zero, shouldAutoScroll: Bool = false) {
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init(labelStrings: [NSAttributedString] = [], labelSize: CGSize = .zero, shouldAutoScroll: Bool = false) {
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super.init(frame: .zero)
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setUpViewHierarchy()
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self.update(with: slides, slideSize: slideSize, shouldAutoScroll: shouldAutoScroll)
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self.update(with: labelStrings, labelSize: labelSize, shouldAutoScroll: shouldAutoScroll)
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}
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required init?(coder: NSCoder) {
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@ -79,29 +80,47 @@ final class PagedScrollView: UIView, UIScrollViewDelegate {
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// MARK: - Content
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public func update(with slides: [UIView] = [], slideSize: CGSize = .zero, shouldAutoScroll: Bool = false) {
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self.slides = slides
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self.slideSize = slideSize
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public func update(with labelStrings: [NSAttributedString] = [], labelSize: CGSize = .zero, shouldAutoScroll: Bool = false) {
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self.labelStrings = labelStrings
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self.labelSize = labelSize
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self.shouldAutoScroll = shouldAutoScroll
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self.shouldArrowsShow = slides.count > 1
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self.shouldScroll = labelStrings.count > 1
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pageControl.numberOfPages = slides.count
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if self.shouldScroll {
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let first: NSAttributedString = labelStrings.first!
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let last: NSAttributedString = labelStrings.last!
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self.labelStrings.append(first)
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self.labelStrings.insert(last, at: 0)
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}
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pageControl.numberOfPages = labelStrings.count
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pageControl.currentPage = 0
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pageControl.isHidden = (slides.count == 1)
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let contentSize = CGSize(width: slideSize.width * CGFloat(slides.count), height: slideSize.height)
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let contentSize = CGSize(width: labelSize.width * CGFloat(self.labelStrings.count), height: labelSize.height)
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scrollView.contentSize = contentSize
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contentWidth.constant = contentSize.width
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contentHeight.constant = contentSize.height
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self.scrollView.setContentOffset(
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CGPoint(
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x: Int(self.labelSize.width) * (self.shouldScroll ? 1 : 0),
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y: 0
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),
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animated: false
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)
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stackView.arrangedSubviews.forEach { $0.removeFromSuperview() }
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self.slides.forEach {
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self.labelStrings.forEach {
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let wrapper: UIView = UIView()
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wrapper.set(.width, to: slideSize.width)
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wrapper.set(.height, to: slideSize.height)
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wrapper.addSubview($0)
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$0.center(in: wrapper)
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wrapper.set(.width, to: labelSize.width)
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wrapper.set(.height, to: labelSize.height)
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let label: UILabel = UILabel()
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label.font = .systemFont(ofSize: Values.verySmallFontSize)
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label.themeTextColor = .textPrimary
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label.lineBreakMode = .byTruncatingTail
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label.attributedText = $0
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wrapper.addSubview(label)
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label.center(in: wrapper)
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stackView.addArrangedSubview(wrapper)
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}
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@ -132,15 +151,15 @@ final class PagedScrollView: UIView, UIScrollViewDelegate {
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private func startScrolling() {
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timer?.invalidate()
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timer = Timer.scheduledTimerOnMainThread(withTimeInterval: Self.autoScrollingTimeInterval, repeats: true) { _ in
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guard self.slides.count != 0 else { return }
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let targetPage = (self.pageControl.currentPage + 1) % self.slides.count
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guard self.labelStrings.count != 0 else { return }
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let targetPage = (self.pageControl.currentPage + 1) % self.labelStrings.count
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self.scrollView.scrollRectToVisible(
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CGRect(
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origin: CGPoint(
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x: Int(self.slideSize.width) * targetPage,
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x: Int(self.labelSize.width) * targetPage,
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y: 0
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),
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size: self.slideSize
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size: self.labelSize
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),
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animated: true
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)
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@ -153,7 +172,43 @@ final class PagedScrollView: UIView, UIScrollViewDelegate {
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}
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func scrollViewDidScroll(_ scrollView: UIScrollView) {
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let pageIndex = round(scrollView.contentOffset.x/slideSize.width)
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pageControl.currentPage = Int(pageIndex)
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let pageIndex: Int = {
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let maybeCurrentPageIndex: Int = Int(round(scrollView.contentOffset.x/labelSize.width))
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if self.shouldScroll {
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if maybeCurrentPageIndex == 0 {
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return pageControl.numberOfPages - 1
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}
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if maybeCurrentPageIndex == self.labelStrings.count - 1 {
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return 0
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}
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return maybeCurrentPageIndex - 1
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}
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return maybeCurrentPageIndex
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}()
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pageControl.currentPage = pageIndex
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}
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func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
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if pageControl.currentPage == 0 {
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scrollView.setContentOffset(
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CGPoint(
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x: Int(self.labelSize.width) * 1,
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y: 0
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),
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animated: false
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)
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}
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if pageControl.currentPage == pageControl.numberOfPages - 1 {
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let realLastIndex: Int = self.labelStrings.count - 2
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scrollView.setContentOffset(
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CGPoint(
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x: Int(self.labelSize.width) * realLastIndex,
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y: 0
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),
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animated: false
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)
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}
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}
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}
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Ryan Zhao
2 years ago