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// StackScrollView.swift
//
// Copyright (c) 2016 muukii
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
import UIKit
open class StackScrollView: UICollectionView, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
private enum LayoutKeys {
static let top = "me.muukii.StackScrollView.top"
static let right = "me.muukii.StackScrollView.right"
static let left = "me.muukii.StackScrollView.left"
static let bottom = "me.muukii.StackScrollView.bottom"
static let width = "me.muukii.StackScrollView.width"
static let height = "me.muukii.StackScrollView.height"
}
private static func defaultLayout() -> UICollectionViewFlowLayout {
let layout = UICollectionViewFlowLayout()
layout.minimumLineSpacing = 0
layout.minimumInteritemSpacing = 0
layout.sectionInset = .zero
return layout
}
@available(*, unavailable)
open override var dataSource: UICollectionViewDataSource? {
didSet {
}
}
@available(*, unavailable)
open override var delegate: UICollectionViewDelegate? {
didSet {
}
}
private var direction: UICollectionView.ScrollDirection {
(collectionViewLayout as! UICollectionViewFlowLayout).scrollDirection
}
// MARK: - Initializers
public override init(frame: CGRect, collectionViewLayout layout: UICollectionViewLayout) {
super.init(frame: frame, collectionViewLayout: layout)
setup()
}
public convenience init(frame: CGRect) {
self.init(frame: frame, collectionViewLayout: StackScrollView.defaultLayout())
setup()
}
public required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setup()
}
private(set) public var views: [UIView] = []
private func identifier(_ v: UIView) -> String {
return v.hashValue.description
}
private func setup() {
backgroundColor = .white
switch direction {
case .vertical:
alwaysBounceVertical = true
case .horizontal:
alwaysBounceHorizontal = true
@unknown default:
fatalError()
}
delaysContentTouches = false
keyboardDismissMode = .interactive
backgroundColor = .clear
super.delegate = self
super.dataSource = self
}
open override func touchesShouldCancel(in view: UIView) -> Bool {
return true
}
open func append(view: UIView) {
views.append(view)
register(Cell.self, forCellWithReuseIdentifier: identifier(view))
reloadData()
}
open func append(views _views: [UIView]) {
views += _views
_views.forEach { view in
register(Cell.self, forCellWithReuseIdentifier: identifier(view))
}
reloadData()
}
@available(*, unavailable, message: "Unimplemented")
func append(lazy: @escaping () -> UIView) {
}
open func insert(views _views: [UIView], at index: Int, animated: Bool, completion: @escaping () -> Void) {
layoutIfNeeded()
var _views = _views
_views.removeAll(where: views.contains(_:))
views.insert(contentsOf: _views, at: index)
_views.forEach { view in
register(Cell.self, forCellWithReuseIdentifier: identifier(view))
}
let batchUpdates: () -> Void = {
self.performBatchUpdates({
self.insertItems(at: (index ..< index.advanced(by: _views.count)).map({ IndexPath(item: $0, section: 0) }))
}, completion: { _ in completion() })
}
if animated {
UIView.animate(
withDuration: 0.5,
delay: 0,
usingSpringWithDamping: 1,
initialSpringVelocity: 0,
options: [
.beginFromCurrentState,
.allowUserInteraction,
.overrideInheritedCurve,
.overrideInheritedOptions,
.overrideInheritedDuration
],
animations: batchUpdates,
completion: nil)
} else {
UIView.performWithoutAnimation(batchUpdates)
}
}
open func insert(views _views: [UIView], before view: UIView, animated: Bool, completion: @escaping () -> Void = {}) {
guard let index = views.firstIndex(of: view) else {
completion()
return
}
insert(views: _views, at: index, animated: animated, completion: completion)
}
open func insert(views _views: [UIView], after view: UIView, animated: Bool, completion: @escaping () -> Void = {}) {
guard let index = views.firstIndex(of: view)?.advanced(by: 1) else {
completion()
return
}
insert(views: _views, at: index, animated: animated, completion: completion)
}
open func remove(view: UIView, animated: Bool, completion: @escaping () -> Void = {}) {
layoutIfNeeded()
if let index = views.firstIndex(of: view) {
views.remove(at: index)
if animated {
UIView.animate(
withDuration: 0.5,
delay: 0,
usingSpringWithDamping: 1,
initialSpringVelocity: 0,
options: [
.beginFromCurrentState,
.allowUserInteraction,
.overrideInheritedCurve,
.overrideInheritedOptions,
.overrideInheritedDuration
],
animations: {
self.performBatchUpdates({
self.deleteItems(at: [IndexPath(item: index, section: 0)])
}, completion: { _ in completion() })
}) { (finish) in
}
} else {
UIView.performWithoutAnimation {
performBatchUpdates({
self.deleteItems(at: [IndexPath(item: index, section: 0)])
}, completion: { _ in completion() })
}
}
}
}
open func remove(views: [UIView], animated: Bool, completion: @escaping () -> Void = {}) {
layoutIfNeeded()
var indicesForRemove: [Int] = []
for view in views {
if let index = self.views.firstIndex(of: view) {
indicesForRemove.append(index)
}
}
// It seems that the layout is not updated properly unless the order is aligned.
indicesForRemove.sort(by: >)
for index in indicesForRemove {
self.views.remove(at: index)
}
if animated {
UIView.animate(
withDuration: 0.5,
delay: 0,
usingSpringWithDamping: 1,
initialSpringVelocity: 0,
options: [
.beginFromCurrentState,
.allowUserInteraction,
.overrideInheritedCurve,
.overrideInheritedOptions,
.overrideInheritedDuration
],
animations: {
self.performBatchUpdates({
self.deleteItems(at: indicesForRemove.map { IndexPath.init(item: $0, section: 0) })
}, completion: { _ in completion() })
})
} else {
UIView.performWithoutAnimation {
performBatchUpdates({
self.deleteItems(at: indicesForRemove.map { IndexPath.init(item: $0, section: 0) })
}, completion: { _ in completion() })
}
}
}
/// This method might fail if the view is out of bounds. Use `func scroll(to view: UIView, at position: UICollectionView.ScrollPosition, animated: Bool)` instead
@available(*, deprecated, message: "Use `scroll(to view: UIView, at position: UICollectionView.ScrollPosition, animated: Bool)` instead")
open func scroll(to view: UIView, animated: Bool) {
let targetRect = view.convert(view.bounds, to: self)
scrollRectToVisible(targetRect, animated: true)
}
open func scroll(to view: UIView, at position: UICollectionView.ScrollPosition, animated: Bool) {
if let index = views.firstIndex(of: view) {
scrollToItem(at: IndexPath(item: index, section: 0), at: position, animated: animated)
}
}
public func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
public func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return views.count
}
public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let view = views[indexPath.item]
let _identifier = identifier(view)
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: _identifier, for: indexPath)
if view.superview == cell.contentView {
return cell
}
precondition(cell.contentView.subviews.isEmpty)
if view is ManualLayoutStackCellType {
cell.contentView.addSubview(view)
} else {
view.translatesAutoresizingMaskIntoConstraints = false
cell.contentView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
cell.contentView.addSubview(view)
let top = view.topAnchor.constraint(equalTo: cell.contentView.topAnchor)
let right = view.rightAnchor.constraint(equalTo: cell.contentView.rightAnchor)
let bottom = view.bottomAnchor.constraint(equalTo: cell.contentView.bottomAnchor)
let left = view.leftAnchor.constraint(equalTo: cell.contentView.leftAnchor)
top.identifier = LayoutKeys.top
right.identifier = LayoutKeys.right
bottom.identifier = LayoutKeys.bottom
left.identifier = LayoutKeys.left
NSLayoutConstraint.activate([
top,
right,
bottom,
left,
])
}
return cell
}
public func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let view = views[indexPath.item]
if let view = view as? ManualLayoutStackCellType {
switch direction {
case .vertical:
return view.size(maxWidth: collectionView.bounds.width, maxHeight: nil)
case .horizontal:
return view.size(maxWidth: nil, maxHeight: collectionView.bounds.height)
@unknown default:
fatalError()
}
} else {
switch direction {
case .vertical:
let width: NSLayoutConstraint = {
guard let c = view.constraints.first(where: { $0.identifier == LayoutKeys.width }) else {
let width = view.widthAnchor.constraint(equalToConstant: collectionView.bounds.width)
width.identifier = LayoutKeys.width
width.isActive = true
return width
}
return c
}()
width.constant = collectionView.bounds.width
let size = view.superview?.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize) ?? view.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize)
return size
case .horizontal:
let heightConstraint: NSLayoutConstraint = {
guard let c = view.constraints.first(where: { $0.identifier == LayoutKeys.height }) else {
let heightConstraint = view.heightAnchor.constraint(equalToConstant: collectionView.bounds.height)
heightConstraint.identifier = LayoutKeys.height
heightConstraint.isActive = true
return heightConstraint
}
return c
}()
heightConstraint.constant = collectionView.bounds.height
let size = view.superview?.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize) ?? view.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize)
return size
@unknown default:
fatalError()
}
}
}
public func updateLayout(animated: Bool) {
if animated {
UIView.animate(
withDuration: 0.5,
delay: 0,
usingSpringWithDamping: 1,
initialSpringVelocity: 0,
options: [
.beginFromCurrentState,
.allowUserInteraction,
.overrideInheritedCurve,
.overrideInheritedOptions,
.overrideInheritedDuration
],
animations: {
self.performBatchUpdates(nil, completion: nil)
self.layoutIfNeeded()
}) { (finish) in
}
} else {
UIView.performWithoutAnimation {
self.performBatchUpdates(nil, completion: nil)
self.layoutIfNeeded()
}
}
}
final class Cell: UICollectionViewCell {
override func preferredLayoutAttributesFitting(_ layoutAttributes: UICollectionViewLayoutAttributes) -> UICollectionViewLayoutAttributes {
return layoutAttributes
}
}
}