ChatLayoutDelegate Protocol Reference


                    
                    
                    shouldPresentHeader(_:at:)

Default implementation

CollectionViewChatLayout will call this method to ask if it should present the header in the current layout.

Default Implementation

Default implementation returns: false.

Declaration

Swift

@MainActor
func shouldPresentHeader(
    _ chatLayout: CollectionViewChatLayout,
    at sectionIndex: Int
) -> Bool

Parameters

`chatLayout`	`CollectionViewChatLayout` reference.
`sectionIndex`	Index of the section.

Return Value

Bool.


                    
                    
                    shouldPresentFooter(_:at:)

Default implementation

CollectionViewChatLayout will call this method to ask if it should present the footer in the current layout.

Default Implementation

Default implementation returns: false.

Declaration

Swift

@MainActor
func shouldPresentFooter(
    _ chatLayout: CollectionViewChatLayout,
    at sectionIndex: Int
) -> Bool

Parameters

`chatLayout`	`CollectionViewChatLayout` reference.
`sectionIndex`	Index of the section.

Return Value

Bool.


                    
                    
                    shouldPinHeaderToVisibleBounds(_:at:)

Default implementation

CollectionViewChatLayout will call this method to ask if it should pin (stick) the header to the visible bounds in the current layout.

NB: This method will be called only if the ChatLayoutSettings.pinnableItems is set to .supplementaryViews

Default Implementation

Default implementation returns: false.

Declaration

Swift

@MainActor
func shouldPinHeaderToVisibleBounds(
    _ chatLayout: CollectionViewChatLayout,
    at sectionIndex: Int
) -> Bool

Parameters

`chatLayout`	`CollectionViewChatLayout` reference.
`sectionIndex`	Index of the section.

Return Value

Bool.


                    
                    
                    shouldPinFooterToVisibleBounds(_:at:)

Default implementation

CollectionViewChatLayout will call this method to ask if it should pin (stick) the footer to the visible bounds in the current layout.

NB: This method will be called only if the ChatLayoutSettings.pinnableItems is set to .supplementaryViews

Default Implementation

Default implementation returns: false.

Declaration

Swift

@MainActor
func shouldPinFooterToVisibleBounds(
    _ chatLayout: CollectionViewChatLayout,
    at sectionIndex: Int
) -> Bool

Parameters

`chatLayout`	`CollectionViewChatLayout` reference.
`sectionIndex`	Index of the section.

Return Value

Bool.


                    
                    
                    pinningTypeForItem(_:at:)

Default implementation

CollectionViewChatLayout will call this method to ask if it should pin (stick) the cell to the visible bounds in the current layout.

NB: This method will be called only if the ChatLayoutSettings.pinnableItems is set to .cells

Default Implementation

Default implementation returns: nil.

Declaration

Swift

@MainActor
func pinningTypeForItem(
    _ chatLayout: CollectionViewChatLayout,
    at indexPath: IndexPath
) -> ChatItemPinningType?

Parameters

`chatLayout`	`CollectionViewChatLayout` reference.
`indexPath`	Index path of the cell.

Return Value

ChatItemPinningType to configure pinning behaviour or nil if pinning is not required.


                    
                    
                    sizeForItem(_:of:at:)

Default implementation

CollectionViewChatLayout will call this method to ask what size the item should have.

NB:

If you are trying to speed up the layout process by returning exact item sizes in this method - do not forget to change UICollectionReusableView.preferredLayoutAttributesFitting(...) method and do not call super.preferredLayoutAttributesFitting(...) there as it will measure the UIView using Autolayout Engine anyway.

Default Implementation

Default implementation returns: ItemSize.auto.

Declaration

Swift

@MainActor
func sizeForItem(
    _ chatLayout: CollectionViewChatLayout,
    of kind: ItemKind,
    at indexPath: IndexPath
) -> ItemSize

Parameters

`chatLayout`	`CollectionViewChatLayout` reference.
`kind`	Type of element represented by `ItemKind`.
`indexPath`	Index path of the item.

Return Value

ItemSize.


                    
                    
                    alignmentForItem(_:of:at:)

Default implementation

CollectionViewChatLayout will call this method to ask what type of alignment the item should have.

Default Implementation

Default implementation returns: ChatItemAlignment.fullWidth.

Declaration

Swift

@MainActor
func alignmentForItem(
    _ chatLayout: CollectionViewChatLayout,
    of kind: ItemKind,
    at indexPath: IndexPath
) -> ChatItemAlignment

Parameters

`chatLayout`	`CollectionViewChatLayout` reference.
`kind`	Type of element represented by `ItemKind`.
`indexPath`	Index path of the item.

Return Value

ChatItemAlignment.


                    
                    
                    initialLayoutAttributesForInsertedItem(_:of:at:modifying:on:)

Default implementation

Asks the delegate to modify a layout attributes instance so that it represents the initial visual state of an item being inserted.

The originalAttributes instance is a reference type, and therefore can be modified directly.

Default Implementation

Default implementation sets a ChatLayoutAttributes.alpha to zero.

Declaration

Swift

@MainActor
func initialLayoutAttributesForInsertedItem(
    _ chatLayout: CollectionViewChatLayout,
    of kind: ItemKind,
    at indexPath: IndexPath,
    modifying originalAttributes: ChatLayoutAttributes,
    on state: InitialAttributesRequestType
)


                    
                    
                    finalLayoutAttributesForDeletedItem(_:of:at:modifying:)

Default implementation

Asks the delegate to modify a layout attributes instance so that it represents the final visual state of an item being removed via UICollectionView.deleteSections(_:).

The originalAttributes instance is a reference type, and therefore can be modified directly.

Default Implementation

Default implementation sets a ChatLayoutAttributes.alpha to zero.

Declaration

Swift

@MainActor
func finalLayoutAttributesForDeletedItem(
    _ chatLayout: CollectionViewChatLayout,
    of kind: ItemKind,
    at indexPath: IndexPath,
    modifying originalAttributes: ChatLayoutAttributes
)


                    
                    
                    interItemSpacing(_:of:after:)

Default implementation

Returns the interval between items. If returns nil - the value from ChatLayoutSettings will be used.

Default Implementation

Default implementation returns: nil.

Declaration

Swift

@MainActor
func interItemSpacing(
    _ chatLayout: CollectionViewChatLayout,
    of kind: ItemKind,
    after indexPath: IndexPath
) -> CGFloat?


                    
                    
                    interSectionSpacing(_:after:)

Default implementation

Returns the interval between sections. If returns nil - the value from ChatLayoutSettings will be used.

Default Implementation

Default implementation returns: nil.

Declaration

Swift

@MainActor
func interSectionSpacing(
    _ chatLayout: CollectionViewChatLayout,
    after sectionIndex: Int
) -> CGFloat?