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Updated example app to demo SwappingContainerView 
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‎ChatLayout.podspec

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@@ -1,6 +1,6 @@
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Pod::Spec.new do |s|
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s.name = 'ChatLayout'
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s.version = '1.2.20'
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s.version = '1.2.21'
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s.summary = 'Chat UI Library. It uses custom UICollectionViewLayout to provide you full control over the presentation.'
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s.swift_version = '5.8'
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‎ChatLayout/Classes/Extras/EdgeAligningView.swift

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@@ -123,6 +123,11 @@ public final class EdgeAligningView<CustomView: UIView>: UIView {
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fatalError("Use init(with:flexibleEdges:) instead.")
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}
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/// A Boolean value that indicates whether the receiver depends on the constraint-based layout system.
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public override class var requiresConstraintBasedLayout: Bool {
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true
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}
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/// Updates constraints for the view.
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public override func updateConstraints() {
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guard lastConstraintsUpdateEdges != flexibleEdges else {
@@ -160,7 +165,7 @@ public final class EdgeAligningView<CustomView: UIView>: UIView {
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}
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customView.translatesAutoresizingMaskIntoConstraints = false
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if !addedConstraints.isEmpty {
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removeConstraints(addedConstraints)
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NSLayoutConstraint.deactivate(addedConstraints)
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addedConstraints.removeAll()
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}
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‎ChatLayout/Classes/Extras/Extensions/NSLayoutAnchor+Extension.swift

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@@ -38,3 +38,7 @@ extension NSLayoutAnchor {
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return constraint
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}
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}
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extension UILayoutPriority {
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static let almostRequired = UILayoutPriority(rawValue: UILayoutPriority.required.rawValue - 1)
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}

‎ChatLayout/Classes/Extras/SwappingContainerView.swift

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‎Example/ChatLayout/Chat/View/Data Source/DefaultChatCollectionDataSource.swift

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@@ -19,6 +19,7 @@ typealias TextMessageCollectionCell = ContainerCollectionViewCell<MessageContain
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typealias URLCollectionCell = ContainerCollectionViewCell<MessageContainerView<EditingAccessoryView, MainContainerView<AvatarView, URLView, StatusView>>>
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typealias ImageCollectionCell = ContainerCollectionViewCell<MessageContainerView<EditingAccessoryView, MainContainerView<AvatarView, ImageView, StatusView>>>
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typealias TitleCollectionCell = ContainerCollectionViewCell<UILabel>
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typealias UserTitleCollectionCell = ContainerCollectionViewCell<SwappingContainerView<EdgeAligningView<UILabel>, UIImageView>>
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typealias TypingIndicatorCollectionCell = ContainerCollectionViewCell<MessageContainerView<EditingAccessoryView, MainContainerView<AvatarPlaceholderView, TextMessageView, VoidViewFactory>>>
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typealias TextTitleView = ContainerCollectionReusableView<UILabel>
@@ -55,6 +56,7 @@ final class DefaultChatCollectionDataSource: NSObject, ChatCollectionDataSource
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collectionView.register(TextMessageCollectionCell.self, forCellWithReuseIdentifier: TextMessageCollectionCell.reuseIdentifier)
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collectionView.register(ImageCollectionCell.self, forCellWithReuseIdentifier: ImageCollectionCell.reuseIdentifier)
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collectionView.register(TitleCollectionCell.self, forCellWithReuseIdentifier: TitleCollectionCell.reuseIdentifier)
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collectionView.register(UserTitleCollectionCell.self, forCellWithReuseIdentifier: UserTitleCollectionCell.reuseIdentifier)
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collectionView.register(TypingIndicatorCollectionCell.self, forCellWithReuseIdentifier: TypingIndicatorCollectionCell.reuseIdentifier)
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collectionView.register(TextTitleView.self, forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: TextTitleView.reuseIdentifier)
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collectionView.register(TextTitleView.self, forSupplementaryViewOfKind: UICollectionView.elementKindSectionFooter, withReuseIdentifier: TextTitleView.reuseIdentifier)
@@ -139,13 +141,35 @@ final class DefaultChatCollectionDataSource: NSObject, ChatCollectionDataSource
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return cell
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}
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private func createGroupTitle(collectionView: UICollectionView, indexPath: IndexPath, alignment: ChatItemAlignment, title: String) -> TitleCollectionCell {
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let cell = collectionView.dequeueReusableCell(withReuseIdentifier: TitleCollectionCell.reuseIdentifier, for: indexPath) as! TitleCollectionCell
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cell.customView.text = title
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cell.customView.preferredMaxLayoutWidth = (collectionView.collectionViewLayout as? CollectionViewChatLayout)?.layoutFrame.width ?? collectionView.frame.width
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cell.customView.textColor = .gray
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cell.customView.numberOfLines = 0
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cell.customView.font = .preferredFont(forTextStyle: .caption2)
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private func createGroupTitle(collectionView: UICollectionView, indexPath: IndexPath, alignment: ChatItemAlignment, title: String) -> UserTitleCollectionCell {
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let cell = collectionView.dequeueReusableCell(withReuseIdentifier: UserTitleCollectionCell.reuseIdentifier, for: indexPath) as! UserTitleCollectionCell
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cell.customView.spacing = 2
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cell.customView.customView.customView.text = title
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cell.customView.customView.customView.preferredMaxLayoutWidth = (collectionView.collectionViewLayout as? CollectionViewChatLayout)?.layoutFrame.width ?? collectionView.frame.width
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cell.customView.customView.customView.textColor = .gray
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cell.customView.customView.customView.numberOfLines = 0
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cell.customView.customView.customView.font = .preferredFont(forTextStyle: .caption2)
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cell.customView.customView.flexibleEdges = [.top]
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cell.customView.accessoryView.contentMode = .scaleAspectFit
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cell.customView.accessoryView.tintColor = .gray
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cell.customView.accessoryView.translatesAutoresizingMaskIntoConstraints = false
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if #available(iOS 13.0, *) {
159+
if cell.customView.accessoryView.image == nil {
160+
cell.customView.accessoryView.image = UIImage(systemName: "person")
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let constraints = [
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cell.customView.accessoryView.widthAnchor.constraint(equalTo: cell.customView.accessoryView.heightAnchor),
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cell.customView.accessoryView.heightAnchor.constraint(equalTo: cell.customView.customView.customView.heightAnchor, constant: 2)
164+
]
165+
constraints.forEach { $0.priority = UILayoutPriority(rawValue: 999) }
166+
cell.customView.customView.customView.setContentHuggingPriority(.required, for: .vertical)
167+
cell.customView.accessoryView.setContentCompressionResistancePriority(.defaultLow, for: .vertical)
168+
NSLayoutConstraint.activate(constraints)
169+
}
170+
} else {
171+
cell.customView.accessoryView.isHidden = true
172+
}
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cell.contentView.layoutMargins = UIEdgeInsets(top: 2, left: 40, bottom: 2, right: 40)
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return cell
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}

‎Example/Podfile.lock

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PODS:
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- ChatLayout (1.2.20):
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- ChatLayout/Ultimate (= 1.2.20)
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- ChatLayout/Core (1.2.20)
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- ChatLayout/Extras (1.2.20):
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- ChatLayout (1.2.21):
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- ChatLayout/Ultimate (= 1.2.21)
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- ChatLayout/Core (1.2.21)
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- ChatLayout/Extras (1.2.21):
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- ChatLayout/Core
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- ChatLayout/Ultimate (1.2.20):
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- ChatLayout/Ultimate (1.2.21):
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- ChatLayout/Core
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- ChatLayout/Extras
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- DifferenceKit (1.3.0):
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:path: "../"
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SPEC CHECKSUMS:
38-
ChatLayout: 6c92dd2c744e32f89310cad07bd1f4a61005be9d
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ChatLayout: 41e1c411b8e32210df9f335ccf93a3ac30a861c5
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DifferenceKit: ab185c4d7f9cef8af3fcf593e5b387fb81e999ca
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FPSCounter: 884afec377de66637808c4f52ecc3b85a404732b
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InputBarAccessoryView: 1d7b0a672b36e370f01f264b3907ef39d03328e3

‎docs/Classes/CellLayoutContainerView.html

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<header class="header">
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<p class="header-col header-col--primary">
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<a class="header-link" href="../index.html">
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ChatLayout 1.2.20 Docs
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ChatLayout 1.2.21 Docs
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</a>
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(100% documented)
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</p>

‎docs/Classes/ChatLayoutAttributes.html

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<header class="header">
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<p class="header-col header-col--primary">
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<a class="header-link" href="../index.html">
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ChatLayout 1.2.20 Docs
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ChatLayout 1.2.21 Docs
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</a>
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(100% documented)
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</p>

‎docs/Classes/ChatLayoutInvalidationContext.html

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<header class="header">
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<p class="header-col header-col--primary">
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<a class="header-link" href="../index.html">
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ChatLayout 1.2.20 Docs
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ChatLayout 1.2.21 Docs
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</a>
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(100% documented)
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</p>

‎docs/Classes/CollectionViewChatLayout.html

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<header class="header">
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<p class="header-col header-col--primary">
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<a class="header-link" href="../index.html">
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ChatLayout 1.2.20 Docs
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ChatLayout 1.2.21 Docs
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</a>
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(100% documented)
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</p>

‎docs/Classes/ContainerCollectionReusableView.html

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<header class="header">
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<p class="header-col header-col--primary">
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<a class="header-link" href="../index.html">
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ChatLayout 1.2.20 Docs
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ChatLayout 1.2.21 Docs
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</a>
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(100% documented)
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</p>

‎docs/Classes/ContainerCollectionViewCell.html

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<header class="header">
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<p class="header-col header-col--primary">
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<a class="header-link" href="../index.html">
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ChatLayout 1.2.20 Docs
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ChatLayout 1.2.21 Docs
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</a>
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(100% documented)
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</p>

‎docs/Classes/EdgeAligningView.html

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<header class="header">
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<p class="header-col header-col--primary">
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<a class="header-link" href="../index.html">
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ChatLayout 1.2.20 Docs
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ChatLayout 1.2.21 Docs
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</a>
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(100% documented)
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</p>
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</section>
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</div>
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</li>
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<li class="item">
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<div>
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<code>
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<a name="/s:10ChatLayout16EdgeAligningViewC023requiresConstraintBasedB0SbvpZ"></a>
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<a name="//apple_ref/swift/Variable/requiresConstraintBasedLayout" class="dashAnchor"></a>
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<a class="token" href="#/s:10ChatLayout16EdgeAligningViewC023requiresConstraintBasedB0SbvpZ">requiresConstraintBasedLayout</a>
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</code>
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</div>
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<div class="height-container">
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<div class="pointer-container"></div>
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<section class="section">
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<div class="pointer"></div>
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<div class="abstract">
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<p>A Boolean value that indicates whether the receiver depends on the constraint-based layout system.</p>
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</div>
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<div class="declaration">
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<h4>Declaration</h4>
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<div class="language">
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<p class="aside-title">Swift</p>
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<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">override</span> <span class="kd">class</span> <span class="k">var</span> <span class="nv">requiresConstraintBasedLayout</span><span class="p">:</span> <span class="kt">Bool</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
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</div>
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</div>
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</section>
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</div>
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</li>
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<li class="item">
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<div>
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<code>

‎docs/Classes/EdgeAligningView/Edge.html

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<header class="header">
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<p class="header-col header-col--primary">
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<a class="header-link" href="../../index.html">
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ChatLayout 1.2.20 Docs
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ChatLayout 1.2.21 Docs
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</a>
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(100% documented)
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</p>

‎docs/Classes/ImageMaskedView.html

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<header class="header">
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<p class="header-col header-col--primary">
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<a class="header-link" href="../index.html">
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ChatLayout 1.2.20 Docs
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ChatLayout 1.2.21 Docs
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</a>
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(100% documented)
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</p>

‎docs/Classes/MessageContainerView.html

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<header class="header">
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<p class="header-col header-col--primary">
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<a class="header-link" href="../index.html">
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ChatLayout 1.2.20 Docs
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ChatLayout 1.2.21 Docs
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</a>
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(100% documented)
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</p>

‎docs/Classes/RoundedCornersContainerView.html

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<header class="header">
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<p class="header-col header-col--primary">
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<a class="header-link" href="../index.html">
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ChatLayout 1.2.20 Docs
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ChatLayout 1.2.21 Docs
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</a>
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(100% documented)
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</p>

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