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

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

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

Parameters

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

Return Value

Bool.


                    
                    
                    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

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

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

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

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

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

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