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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,191 @@ | ||
| // | ||
| // TagsView.swift | ||
| // Apple-Music-Search-Chips-Demo | ||
| // | ||
| // Created by Seb Vidal on 07/09/2024. | ||
| // Modified by XITRIX on 14/11/2024. | ||
| // | ||
|
|
||
| import Combine | ||
| import UIKit | ||
|
|
||
| class TagsView: UIScrollView { | ||
| private var lastUpdatedFrame: CGRect = .zero | ||
| private var bottomStackView: UIStackView! | ||
| private var topStackView: UIStackView! | ||
| private var backgroundView: UIView! | ||
| private var tagMaskView: UIView! | ||
|
|
||
| var titles: [String] = [] { | ||
| didSet { updateButtons(for: titles) } | ||
| } | ||
|
|
||
| @Published var selectedTagIndex: Int = 0 { | ||
| didSet { | ||
| updateSelection(for: selectedTagIndex, animated: true) | ||
| } | ||
| } | ||
|
|
||
| override init(frame: CGRect) { | ||
| super.init(frame: frame) | ||
| setupScrollView() | ||
| setupBottomStackView() | ||
| setupTopStackView() | ||
| setupBackgroundView() | ||
| setupTagMaskView() | ||
| } | ||
|
|
||
| @available(*, unavailable) | ||
| required init?(coder: NSCoder) { | ||
| fatalError("init(coder:) has not been implemented") | ||
| } | ||
|
|
||
| func scrollToSelectedItem() { | ||
| let button = bottomStackView.arrangedSubviews[selectedTagIndex] | ||
| scrollRectToVisible(button.frame, animated: true) | ||
| } | ||
|
|
||
| private func setupScrollView() { | ||
| alwaysBounceHorizontal = true | ||
| showsHorizontalScrollIndicator = false | ||
| contentInsetAdjustmentBehavior = .automatic | ||
| } | ||
|
|
||
| private func setupBottomStackView() { | ||
| bottomStackView = UIStackView() | ||
| bottomStackView.axis = .horizontal | ||
| bottomStackView.distribution = .fillProportionally | ||
| bottomStackView.isLayoutMarginsRelativeArrangement = true | ||
| bottomStackView.translatesAutoresizingMaskIntoConstraints = false | ||
|
|
||
| addSubview(bottomStackView) | ||
|
|
||
| NSLayoutConstraint.activate([ | ||
| bottomStackView.topAnchor.constraint(equalTo: topAnchor), | ||
| bottomStackView.leadingAnchor.constraint(equalTo: leadingAnchor), | ||
| bottomStackView.trailingAnchor.constraint(equalTo: trailingAnchor), | ||
| bottomStackView.bottomAnchor.constraint(equalTo: bottomAnchor) | ||
| ]) | ||
| } | ||
|
|
||
| private func setupTopStackView() { | ||
| topStackView = UIStackView() | ||
| topStackView.axis = .horizontal | ||
| topStackView.isUserInteractionEnabled = false | ||
| topStackView.distribution = .fillProportionally | ||
| topStackView.isLayoutMarginsRelativeArrangement = true | ||
| topStackView.translatesAutoresizingMaskIntoConstraints = false | ||
|
|
||
| addSubview(topStackView) | ||
|
|
||
| NSLayoutConstraint.activate([ | ||
| topStackView.topAnchor.constraint(equalTo: topAnchor), | ||
| topStackView.leadingAnchor.constraint(equalTo: leadingAnchor), | ||
| topStackView.trailingAnchor.constraint(equalTo: trailingAnchor), | ||
| topStackView.bottomAnchor.constraint(equalTo: bottomAnchor) | ||
| ]) | ||
| } | ||
|
|
||
| private func setupBackgroundView() { | ||
| backgroundView = UIView() | ||
| backgroundView.clipsToBounds = true | ||
| backgroundView.backgroundColor = .tintColor | ||
| backgroundView.layer.cornerCurve = .continuous | ||
|
|
||
| insertSubview(backgroundView, aboveSubview: bottomStackView) | ||
| } | ||
|
|
||
| private func setupTagMaskView() { | ||
| tagMaskView = UIView() | ||
| tagMaskView.clipsToBounds = true | ||
| tagMaskView.backgroundColor = .black | ||
| tagMaskView.layer.cornerCurve = .continuous | ||
|
|
||
| topStackView.mask = tagMaskView | ||
| } | ||
|
|
||
| private func updateButtons(for titles: [String]) { | ||
| bottomStackView.arrangedSubviews.forEach { subview in | ||
| subview.removeFromSuperview() | ||
| } | ||
|
|
||
| topStackView.arrangedSubviews.forEach { subview in | ||
| subview.removeFromSuperview() | ||
| } | ||
|
|
||
| for title in titles { | ||
| let bottomButton = button(with: title, foregroundColor: .label) | ||
| bottomStackView.addArrangedSubview(bottomButton) | ||
|
|
||
| let topButton = button(with: title, foregroundColor: .white) | ||
| topStackView.addArrangedSubview(topButton) | ||
| } | ||
|
|
||
| setNeedsLayout() | ||
| layoutIfNeeded() | ||
|
|
||
| updateSelection(for: selectedTagIndex, animated: false) | ||
| } | ||
|
|
||
| private func button(with title: String, foregroundColor: UIColor) -> UIButton { | ||
| let titleTextAttributesTransformer = UIConfigurationTextAttributesTransformer { container in | ||
| var container = container | ||
| container.font = UIFont.systemFont(ofSize: 13, weight: .semibold) | ||
|
|
||
| return container | ||
| } | ||
|
|
||
| let button = UIButton(type: .system) | ||
| button.configuration = .plain() | ||
| button.configuration?.title = title | ||
| button.configuration?.cornerStyle = .capsule | ||
| button.configuration?.baseForegroundColor = foregroundColor | ||
| button.configuration?.titleTextAttributesTransformer = titleTextAttributesTransformer | ||
| button.configuration?.contentInsets = NSDirectionalEdgeInsets(top: 8.33, leading: 12, bottom: 8, trailing: 12.66) | ||
| button.addTarget(self, action: #selector(tagButtonTapped), for: .touchUpInside) | ||
|
|
||
| return button | ||
| } | ||
|
|
||
| @objc private func tagButtonTapped(_ sender: UIButton) { | ||
| selectedTagIndex = bottomStackView.arrangedSubviews.firstIndex(of: sender)! | ||
| } | ||
|
|
||
| private func updateSelection(for selectedTagIndex: Int, animated: Bool) { | ||
| let update = { [self] in | ||
| if bottomStackView.arrangedSubviews.indices.contains(selectedTagIndex) { | ||
| let button = bottomStackView.arrangedSubviews[selectedTagIndex] | ||
|
|
||
| tagMaskView.layer.cornerRadius = button.frame.height / 2 | ||
| tagMaskView.frame = button.frame | ||
|
|
||
| backgroundView.layer.cornerRadius = button.frame.height / 2 | ||
| backgroundView.frame = button.frame | ||
|
|
||
| scrollRectToVisible(button.frame, animated: true) | ||
| } | ||
| } | ||
|
|
||
| guard animated | ||
| else { return update() } | ||
|
|
||
| if #available(iOS 17.0, *) { | ||
| UIView.animate(springDuration: 0.25, bounce: 0.25) { | ||
| update() | ||
| } | ||
| } else { | ||
| UIView.animate(withDuration: 0.25) { | ||
| update() | ||
| } | ||
| } | ||
| } | ||
|
|
||
| override func layoutSubviews() { | ||
| super.layoutSubviews() | ||
|
|
||
| guard backgroundView.frame == .zero | ||
| else { return } | ||
|
|
||
| updateSelection(for: selectedTagIndex, animated: false) | ||
| } | ||
| } |
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