SwiftUI layout containers use alignment guides to position views relative to each other. The post covers three levels of alignment control: using built-in guides (like firstTextBaseline) on containers, overriding a specific view's guide value with alignmentGuide(_:computeValue:) for custom artwork, and defining entirely custom alignment guides via the AlignmentID protocol. The custom guide technique is especially useful when the target reference point lives inside a nested container — an explicit value from a descendant propagates up to the outer container, enabling precise alignment across hierarchy boundaries without fixed offsets or frame math.
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