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Cupertino Precision Checkbox
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A high-fidelity checkbox component following Apple's iOS design language. It utilizes a custom-engineered SVG path animation that 'draws' the checkmark upon selection. The interaction features a tactile 'pop' animation and uses the signature San Francisco-adjacent typography (Inter). The component is built with accessibility in mind, featuring clear focus rings and a responsive active state that mimics physical button compression.
Features
- SVG Path Drawing Animation
- iOS Signature Blue (#007AFF)
- Tactile Scale-Feedback on Click
- Cubic-Bezier Smooth Transitions
- System-level Accessibility Support
- Resolution-Independent Vector Graphics
Uses
- Mobile-First Web Applications
- Settings and Preference Panels
- Clean Dashboard Interfaces
- Premium Onboarding Flows
Benefits
- Familiar UX for iOS Users
- Ultra-lightweight Asset Footprint
- High Contrast for Improved Readability
- Smooth 60fps Animation Performance
Techniques Used
Tailwind CSS peer-state selectors, SVG stroke-dasharray animations, CSS keyframe transforms, and custom cubic-bezier timing functions.
Frequently Asked Questions
How is the stroke-dashoffset calculated for the checkmark SVG to ensure the 'drawing' animation begins exactly at the vertex?
The component utilizes a normalized pathLength attribute of 100 on the SVG path element. This allows the CSS transition to manipulate the stroke-dashoffset from 100 to 0 using a cubic-bezier(0.65, 0, 0.35, 1) timing function, ensuring the vector line follows the specific coordinates of the checkmark without manual pixel-length calculations.
Does the tactile scale-feedback on click utilize transform: scale() or a physical width/height adjustment to prevent layout reflows?
The 'pop' animation is strictly handled via transform: scale(0.92) on the :active state and scale(1) on the :checked state. By using the GPU-accelerated transform property instead of box-model properties, the component avoids triggering a layout engine reflow, maintaining a consistent 60fps even on low-powered mobile devices.
How does the component maintain the iOS signature blue (#007AFF) accessibility contrast ratios when the background-color is dynamic?
The component implements a color-mix(in srgb, var(--cupertino-blue), #ffffff 20%) fallback for dark modes and uses a forced-colors media query. This ensures that if a user enables high-contrast mode at the OS level, the SVG stroke and focus ring automatically map to System Colors like 'Highlight' or 'CanvasText'.
Can the cubic-bezier transition be modified to simulate a 'stiff' spring versus a 'loose' spring without adding an external physics library?
Yes, the component exposes a --checkbox-transition-timing CSS variable. By adjusting the fourth parameter of the cubic-bezier (e.g., from 1.275 for high overshoot to 1.0 for zero overshoot), you can manipulate the 'springiness' of the scale-up animation while keeping the bundle size minimal.
How is the resolution-independent vector checkmark rendered to prevent pixel-bleeding on non-Retina displays?
The SVG utilizes shape-rendering: geometricPrecision and the stroke-linecap: round attribute. This, combined with an internal 24x24 viewBox and precise integer-based path data, prevents sub-pixel anti-aliasing artifacts that typically cause blurriness when vector graphics are scaled to fractional sizes.