27.7 Summary

The SwiftUI stack container views can be configured using basic alignment settings that control the positioning of all child views relative to the container. Alignment of individual views within a stack may be configured using alignment guides. An alignment guide includes a closure which is passed a ViewDimensions object which can be used to compute the alignment position for the view based on the view’s height and width. These alignment guides can be implemented as custom alignments which can be reused in the same way as standard alignments when declaring a stack view layout. Custom alignments are also a useful tool when views contained in different stacks need to be aligned with each other. Custom alignment of ZStack child views requires both horizontal and vertical alignment guides.