Generate Apple HIG Presentation Components

Compiles Apple's Human Interface Guidelines for five presentation components - alerts, action sheets, popovers, sheets, and digit entry views - into ten synthesized "Key Principles" plus the full underlying Apple guidance for each component. The principles set out when to reach for each: alerts sparingly, for critical situations needing acknowledgment or destructive-action confirmation; sheets for focused tasks that preserve context (creating items, editing settings, multi-step forms); popovers as the non-modal choice on iPad and Mac, appearing next to their trigger and dismissed by tapping outside; and action sheets for choosing among actions, especially when one is destructive (sliding up from the bottom on iPhone, appearing as popovers on iPad). It also gives concrete content rules pulled from Apple's own docs: alert button titles should be specific verbs ("Delete," "Save") rather than "OK," destructive buttons get the destructive red style and are placed where users are less likely to tap them reflexively, action sheets should cap at four buttons including Cancel, and iOS sheets support "large" and "medium" detents with a draggable grabber for resizing.

Use it when deciding which presentation component fits a given interruption or task, and when writing the title, message, and button copy for it, across iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. The guidance is explicit about restraint: avoid an alert merely to convey information (find an in-context alternative instead), avoid alerting on common, undoable, destructive actions like deleting an email, and avoid showing an alert at app launch. Digit entry views are a narrow case - a secure, full-screen PIN-style keyboard - and per Apple's own platform table are not supported on iOS, iPadOS, macOS, visionOS, or watchOS. Popovers are unsupported on tvOS and watchOS, and action sheets are unsupported on visionOS; picking a component means checking its platform-support list first.

There is no API - output is a recommended presentation type with rationale, per the skill's own Output Format (recommended type, content guidelines, dismiss behavior, non-modal alternatives), informed by asking what information or action is needed, whether it's blocking, which platforms are targeted, and how often it appears. The underlying reference files spell out per-platform button placement (macOS sheet dismiss buttons sit bottom-trailing, iOS ones sit top-trailing for Done and top-leading for Cancel), developer API pointers (SwiftUI's alert(_:isPresented:actions:), confirmationDialog, popover(...), and sheet(item:onDismiss:content:); UIKit's UIAlertController and UISheetPresentationController; AppKit's NSAlert and NSPopover), and dated change-log entries tracking when platform guidance such as visionOS support was added.

Cross-references four sibling HIG skills covering adjacent surfaces: hig-components-menus for the buttons and toolbar items that trigger these presentations, hig-components-controls for input controls used inside sheets and popovers, hig-patterns for modality and interruption-flow guidance, and hig-foundations for the color, typography, and layout rules that style them.

Designers and developers building native Apple-platform UIs who need to choose the right modal or non-modal presentation and write Apple-style, platform-correct copy and dismiss behavior for it, without re-deriving the rules from Apple's documentation site each time.