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68 lines
2.3 KiB
Swift
68 lines
2.3 KiB
Swift
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final class ScrollToBottomButton : UIView {
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private weak var delegate: ScrollToBottomButtonDelegate?
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// MARK: Settings
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private static let size: CGFloat = 40
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private static let iconSize: CGFloat = 16
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// MARK: Lifecycle
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init(delegate: ScrollToBottomButtonDelegate) {
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self.delegate = delegate
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super.init(frame: CGRect.zero)
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setUpViewHierarchy()
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}
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override init(frame: CGRect) {
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preconditionFailure("Use init(delegate:) instead.")
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}
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required init?(coder: NSCoder) {
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preconditionFailure("Use init(delegate:) instead.")
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}
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private func setUpViewHierarchy() {
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// Background & blur
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let backgroundView = UIView()
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backgroundView.backgroundColor = isLightMode ? .white : .black
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backgroundView.alpha = Values.lowOpacity
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addSubview(backgroundView)
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backgroundView.pin(to: self)
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let blurView = UIVisualEffectView(effect: UIBlurEffect(style: .regular))
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addSubview(blurView)
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blurView.pin(to: self)
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// Size & shape
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let size = ScrollToBottomButton.size
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set(.width, to: size)
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set(.height, to: size)
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layer.cornerRadius = size / 2
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layer.masksToBounds = true
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// Border
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layer.borderWidth = Values.separatorThickness
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let borderColor = (isLightMode ? UIColor.black : UIColor.white).withAlphaComponent(Values.veryLowOpacity)
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layer.borderColor = borderColor.cgColor
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// Icon
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let tint = isLightMode ? UIColor.black : UIColor.white
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let icon = UIImage(named: "ic_chevron_down")!.withTint(tint)
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let iconImageView = UIImageView(image: icon)
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iconImageView.set(.width, to: ScrollToBottomButton.iconSize)
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iconImageView.set(.height, to: ScrollToBottomButton.iconSize)
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iconImageView.contentMode = .scaleAspectFit
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addSubview(iconImageView)
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iconImageView.center(in: self)
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// Gesture recognizer
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let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(handleTap))
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addGestureRecognizer(tapGestureRecognizer)
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}
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// MARK: Interaction
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@objc private func handleTap() {
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delegate?.handleScrollToBottomButtonTapped()
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}
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}
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protocol ScrollToBottomButtonDelegate : class {
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func handleScrollToBottomButtonTapped()
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}
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