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Return empty layout model is layout delegate is empty. #304

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Mar 13, 2017
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Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,15 @@ public struct ChatCollectionViewLayoutModel {
calculatedForWidth: collectionViewWidth
)
}

public static func createEmptyModel() -> ChatCollectionViewLayoutModel {
return ChatCollectionViewLayoutModel(
contentSize: .zero,
layoutAttributes: [],
layoutAttributesBySectionAndItem: [],
calculatedForWidth: 0
)
}
}

open class ChatCollectionViewLayout: UICollectionViewLayout {
Expand All @@ -77,7 +86,10 @@ open class ChatCollectionViewLayout: UICollectionViewLayout {
open override func prepare() {
super.prepare()
guard self.layoutNeedsUpdate else { return }
guard let delegate = self.delegate else { return }
guard let delegate = self.delegate else {
self.layoutModel = ChatCollectionViewLayoutModel.createEmptyModel()
return
}
var oldLayoutModel = self.layoutModel
self.layoutModel = delegate.chatCollectionViewLayoutModel()
self.layoutNeedsUpdate = false
Expand Down