MessagesLayoutDelegate

The MessagesLayoutDelegate protocol is responsible for sizing all the content inside a MessageCollectionViewCell and adjusting the cell's subviews position in relation to each other. All of MessagesLayoutDelegate methods have default implementations. You can provide your own implementation to override their behavior.

Adjusting the Size of the Avatar

    func avatarSize(for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> CGSize

You can use the avatarSize method to adjust the size of the AvatarView for each MessageCollectionView cell. The default size is 30 x 30. If you don't want an AvatarView in your cell, just return a value of .zero.

Adjusting the position of the Avatar

    func avatarAlignment(for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> AvatarAlignment

You can use the avatarAlignment method to adjust the position of the AvatarView in the cell relative to the MessageCollectionViewCell or the MessageContainerView. This method requires you return a value from the AvatarAlignment enum which has the following 5 cases:

AvatarAlignment

public enum AvatarAlignment {
	case cellTop
	case messageTop
	case messageCenter
	case messageBottom
	case cellBottom
}

The default value for this method is .cellBottom.

Adjusting the cellTopLabel & cellBottomLabel positions

    func cellTopLabelAlignment(for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> LabelAlignment

    func cellBottomLabelAlignment(for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> LabelAlignment

You can use the cellTopLabelAlignment and cellBottomLabelAlignment methods to adjust the position of the labels relative to the MessageCollectionViewCell or the MessageContainerView. This method requires you return a value from the LabelAlignment enum which has the following 5 cases:

public enum LabelAlignment {
	case cellTrailing
	case cellLeading
	case cellCenter
	case messageTrailing
	case messageLeading
}

By default, the cellTopLabel is aligned .messageTrailing if the message is from the current sender and .messageLeading otherwise.

By default, the cellBottomLabel is aligned .messageLeading if the message is from the current sender and .messageTrailing otherwise.

Adjusting the size of the MessageHeaderView and MessageFooterView

    func headerViewSize(for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> CGSize

    func footerViewSize(for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> CGSize

You can use the headerViewSize and footerViewSize methods to adjust the size of the header or footer views for each MessageCollectionViewCell. If you don't want to display a MessageHeaderView or MessageFooterView just return a size of .zero respectively.

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