Auto Layout: Describing Relationships, Not Frames
Auto Layout lets you describe a UI by its relationships, not hardcoded coordinates. You declare "this button is centered and 8 points below the logo," and the system calculates its position.
Auto Layout is a declarative system for describing your UI's layout through relationships, not fixed coordinates. You define constraints like "this button is centered and 8 points below the logo," and the system calculates the frames. This is crucial for adaptive UIs that handle external changes (device rotation, split-screen) and internal changes (translated text, Dynamic Type). The main footgun is creating conflicting or incomplete rules, leading to unsatisfiable or ambiguous layout errors at runtime.
Read the original → developer.apple.com
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