MCPInstall

ui-mobile

Mobile UI patterns - React Native, iOS/Android, touch targets

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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/alinaqi/maggy --skill ui-mobile
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads ui-mobile automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Mobile UI Design Skill (React Native)


MANDATORY: Mobile Accessibility Standards

These rules are NON-NEGOTIABLE. Every UI element must pass these checks.

1. Touch Targets (CRITICAL)

// MINIMUM 44x44 points for ALL interactive elements
const MINIMUM_TOUCH_SIZE = 44;

// EVERY button, link, icon button must meet this
const styles = StyleSheet.create({
  button: {
    minHeight: MINIMUM_TOUCH_SIZE,
    minWidth: MINIMUM_TOUCH_SIZE,
    paddingVertical: 12,
    paddingHorizontal: 16,
  },
  iconButton: {
    width: MINIMUM_TOUCH_SIZE,
    height: MINIMUM_TOUCH_SIZE,
    justifyContent: 'center',
    alignItems: 'center',
  },
});

// NEVER DO THIS:
style={{ height: 30 }}  // ✗ TOO SMALL
style={{ padding: 4 }}  // ✗ RESULTS IN TINY TARGET

2. Color Contrast (CRITICAL)

// WCAG 2.1 AA: 4.5:1 for text, 3:1 for large text/UI

// SAFE COMBINATIONS:
const colors = {
  // Light mode
  textPrimary: '#000000',     // on white = 21:1 ✓
  textSecondary: '#374151',   // gray-700 on white = 9.2:1 ✓

  // Dark mode
  textPrimaryDark: '#FFFFFF', // on gray-900 = 16:1 ✓
  textSecondaryDark: '#E5E7EB', // gray-200 on gray-900 = 11:1 ✓
};

// FORBIDDEN - FAILS CONTRAST:
// ✗ '#9CA3AF' (gray-400) on white = 2.6:1
// ✗ '#6B7280' (gray-500) on '#111827' = 4.0:1
// ✗ Any text below 4.5:1 ratio

3. Visibility Rules

// ALL BUTTONS MUST HAVE visible boundaries

// PRIMARY: Solid background with contrasting text
<Pressable style={styles.primaryButton}>
  <Text style={{ color: '#FFFFFF' }}>Submit</Text>
</Pressable>

const styles = StyleSheet.create({
  primaryButton: {
    backgroundColor: '#1F2937', // gray-800
    paddingVertical: 16,
    paddingHorizontal: 24,
    borderRadius: 12,
    minHeight: 44,
  },
});

// SECONDARY: Visible background
<Pressable style={styles.secondaryButton}>
  <Text style={{ color: '#1F2937' }}>Cancel</Text>
</Pressable>

const styles = StyleSheet.create({
  secondaryButton: {
    backgroundColor: '#F3F4F6', // gray-100
    minHeight: 44,
  },
});

// GHOST: MUST have visible border
<Pressable style={styles.ghostButton}>
  <Text style={{ color: '#374151' }}>Skip</Text>
</Pressable>

const styles = StyleSheet.create({
  ghostButton: {
    borderWidth: 1,
    borderColor: '#D1D5DB', // gray-300
    minHeight: 44,
  },
});

// NEVER CREATE invisible buttons:
// ✗ backgroundColor: 'transparent' without border
// ✗ Text color matching background

4. Accessibility Labels (REQUIRED)

// EVERY interactive element needs accessibility props

// Buttons
<Pressable
  accessible={true}
  accessibilityRole="button"
  accessibilityLabel="Submit form"
  accessibilityHint="Double tap to submit your information"
>
  <Text>Submit</Text>
</Pressable>

// Icon buttons (NO visible text = MUST have label)
<Pressable
  accessible={true}
  accessibilityRole="button"
  accessibilityLabel="Close menu"
>
  <CloseIcon />
</Pressable>

// Images
<Image
  accessible={true}
  accessibilityRole="image"
  accessibilityLabel="User profile photo"
  source={...}
/>

5. Focus/Selection States

// EVERY Pressable needs visible pressed state
<Pressable
  style={({ pressed }) => [
    styles.button,
    pressed && styles.buttonPressed,
  ]}
>
  {children}
</Pressable>

const styles = StyleSheet.create({
  button: {
    backgroundColor: '#1F2937',
  },
  buttonPressed: {
    opacity: 0.7,
    // OR
    backgroundColor: '#374151',
  },
});

Core Philosophy

Mobile UI is about touch, speed, and focus. No hover states, smaller screens, thumb-friendly targets. Design for one-handed use and interruption recovery.

Platform Differences

iOS vs Android

import { Platform } from 'react-native';

// Platform-specific values
const styles = StyleSheet.create({
  shadow: Platform.select({
    ios: {
      shadowColor: '#000',
      shadowOffset: { width: 0, height: 2 },
      shadowOpacity: 0.1,
      shadowRadius: 8,
    },
    android: {
      elevation: 4,
    },
  }),

  // iOS uses SF Pro, Android uses Roboto
  text: {
    fontFamily: Platform.OS === 'ios' ? 'System' : 'Roboto',
  },
});

Design Language

iOS (Human Interface Guidelines)
─────────────────────────────────
- Flat design with subtle depth
- SF Symbols for icons
- Large titles (34pt)
- Rounded corners (10-14pt)
- Blue as default tint

Android (Material Design 3)
─────────────────────────────────
- Material You dynamic color
- Outlined/filled icons
- Medium titles (22pt)
- Rounded corners (12-28pt)
- Primary color from theme

Spacing System

4px Base Grid

// React Native spacing - consistent scale
const spacing = {
  xs: 4,
  sm: 8,
  md: 16,
  lg: 24,
  xl: 32,
  '2xl': 48,
} as const;

// Usage
const styles = StyleSheet.create({
  container: {
    padding: spacing.md,
    gap: spacing.sm,
  },
});

Safe Areas

import { useSafeAreaInsets } from 'react-native-safe-area-context';

const Screen = ({ children }) => {
  const insets = useSafeAreaInsets();

  return (
    <View style={{
      flex: 1,
      paddingTop: insets.top,
      paddingBottom: insets.bottom,
      paddingLeft: Math.max(insets.left, 16),
      paddingRight: Math.max(insets.right, 16),
    }}>
      {children}
    </View>
  );
};

Typography

Type Scale

const typography = {
  // Large titles (iOS style)
  largeTitle: {
    fontSize: 34,
    fontWeight: '700' as const,
    letterSpacing: 0.37,
  },

  // Section headers
  title: {
    fontSize: 22,
    fontWeight: '700' as const,
    letterSpacing: 0.35,
  },

  // Card titles
  headline: {
    fontSize: 17,
    fontWeight: '600' as const,
    letterSpacing: -0.41,
  },

  // Body text
  body: {
    fontSize: 17,
    fontWeight: '400' as const,
    letterSpacing: -0.41,
    lineHeight: 22,
  },

  // Secondary text
  callout: {
    fontSize: 16,
    fontWeight: '400' as const,
    letterSpacing: -0.32,
  },

  // Small labels
  caption: {
    fontSize: 12,
    fontWeight: '400' as const,
    letterSpacing: 0,
  },
};

Color System

Semantic Colors

// Use semantic names, not literal colors
const colors = {
  // Backgrounds
  background: '#FFFFFF',
  backgroundSecondary: '#F2F2F7',
  backgroundTertiary: '#FFFFFF',

  // Surfaces
  surface: '#FFFFFF',
  surfaceElevated: '#FFFFFF',

  // Text
  label: '#000000',
  labelSecondary: '#3C3C43', // 60% opacity
  labelTertiary: '#3C3C43',  // 30% opacity

  // Actions
  primary: '#007AFF',
  destructive: '#FF3B30',
  success: '#34C759',
  warning: '#FF9500',

  // Separators
  separator: '#3C3C43', // 29% opacity
  opaqueSeparator: '#C6C6C8',
};

// Dark mode variants
const darkColors = {
  background: '#000000',
  backgroundSecondary: '#1C1C1E',
  label: '#FFFFFF',
  labelSecondary: '#EBEBF5', // 60% opacity
  separator: '#545458',
};

Dynamic Colors (React Native)

import { useColorScheme } from 'react-native';

const useColors = () => {
  const scheme = useColorScheme();
  return scheme === 'dark' ? darkColors : colors;
};

// Usage
const MyComponent = () => {
  const colors = useColors();
  return (
    <View style={{ backgroundColor: colors.background }}>
      <Text style={{ color: colors.label }}>Hello</Text>
    </View>
  );
};

Touch Targets

Minimum Sizes

// CRITICAL: Minimum 44pt touch targets
const touchable = {
  minHeight: 44,
  minWidth: 44,
};

// Button with proper sizing
const styles = StyleSheet.create({
  button: {
    minHeight: 44,
    paddingHorizontal: 16,
    paddingVertical: 12,
    justifyContent: 'center',
    alignItems: 'center',
  },

  // Icon button (square)
  iconButton: {
    width: 44,
    height: 44,
    justifyContent: 'center',
    alignItems: 'center',
  },

  // List row
  listRow: {
    minHeight: 44,
    paddingVertical: 12,
    paddingHorizontal: 16,
  },
});

Touch Feedback

import { Pressable } from 'react-native';

// iOS-style opacity feedback
const Button = ({ children, onPress }) => (
  <Pressable
    onPress={onPress}
    style={({ pressed }) => [
      styles.button,
      pressed && { opacity: 0.7 },
    ]}
  >
    {children}
  </Pressable>
);

// Android-style ripple
const AndroidButton = ({ children, onPress }) => (
  <Pressable
    onPress={onPress}
    android_ripple={{
      color: 'rgba(0, 0, 0, 0.1)',
      borderless: false,
    }}
    style={styles.button}
  >
    {children}
  </Pressable>
);

Component Patterns

Cards

const Card = ({ children, style }) => (
  <View style={[styles.card, style]}>
    {children}
  </View>
);

const styles = StyleSheet.create({
  card: {
    backgroundColor: '#FFFFFF',
    borderRadius: 12,
    padding: 16,
    ...Platform.select({
      ios: {
        shadowColor: '#000',
        shadowOffset: { width: 0, height: 2 },
        shadowOpacity: 0.08,
        shadowRadius: 8,
      },
      android: {
        elevation: 2,
      },
    }),
  },
});

Buttons

// Primary button
const PrimaryButton = ({ title, onPress, disabled }) => (
  <Pressable
    onPress={onPress}
    disabled={disabled}
    style={({ pressed }) => [
      styles.primaryButton,
      pressed && styles.primaryButtonPressed,
      disabled && styles.buttonDisabled,
    ]}
  >
    <Text style={styles.primaryButtonText}>{title}</Text>
  </Pressable>
);

const styles = StyleSheet.create({
  primaryButton: {
    backgroundColor: '#007AFF',
    borderRadius: 12,
    paddingVertical: 16,
    paddingHorizontal: 24,
    alignItems: 'center',
  },
  primaryButtonPressed: {
    backgroundColor: '#0056B3',
  },
  primaryButtonText: {
    color: '#FFFFFF',
    fontSize: 17,
    fontWeight: '600',
  },
  buttonDisabled: {
    opacity: 0.5,
  },
});

// Secondary button
const SecondaryButton = ({ title, onPress }) => (
  <Pressable
    onPress={onPress}
    style={({ pressed }) => [
      styles.secondaryButton,
      pressed && { opacity: 0.7 },
    ]}
  >
    <Text style={styles.secondaryButtonText}>{title}</Text>
  </Pressable>
);

Input Fields

const TextField = ({ label, value, onChangeText, error }) => {
  const [focused, setFocused] = useState(false);

  return (
    <View style={styles.textFieldContainer}>
      {label && (
        <Text style={styles.textFieldLabel}>{label}</Text>
      )}
      <TextInput
        value={value}
        onChangeText={onChangeText}
        onFocus={() => setFocused(true)}
        onBlur={() => setFocused(false)}
        style={[
          styles.textField,
          focused && styles.textFieldFocused,
          error && styles.textFieldError,
        ]}
        placeholderTextColor="#8E8E93"
      />
      {error && (
        <Text style={styles.errorText}>{error}</Text>
      )}
    </View>
  );
};

const styles = StyleSheet.create({
  textFieldContainer: {
    gap: 8,
  },
  textFieldLabel: {
    fontSize: 15,
    fontWeight: '500',
    color: '#3C3C43',
  },
  textField: {
    backgroundColor: '#F2F2F7',
    borderRadius: 10,
    paddingHorizontal: 16,
    paddingVertical: 14,
    fontSize: 17,
    color: '#000000',
    borderWidth: 2,
    borderColor: 'transparent',
  },
  textFieldFocused: {
    borderColor: '#007AFF',
    backgroundColor: '#FFFFFF',
  },
  textFieldError: {
    borderColor: '#FF3B30',
  },
  errorText: {
    fontSize: 13,
    color: '#FF3B30',
  },
});

Lists

// Grouped list (iOS Settings style)
const GroupedList = ({ sections }) => (
  <ScrollView style={styles.groupedList}>
    {sections.map((section, i) => (
      <View key={i} style={styles.section}>
        {section.title && (
          <Text style={styles.sectionHeader}>{section.title}</Text>
        )}
        <View style={styles.sectionContent}>
          {section.items.map((item, j) => (
            <React.Fragment key={j}>
              {j > 0 && <View style={styles.separator} />}
              <Pressable
                style={({ pressed }) => [
                  styles.listRow,
                  pressed && { backgroundColor: '#E5E5EA' },
                ]}
                onPress={item.onPress}
              >
                <Text style={styles.listRowText}>{item.title}</Text>
                <ChevronRight color="#C7C7CC" />
              </Pressable>
            </React.Fragment>
          ))}
        </View>
      </View>
    ))}
  </ScrollView>
);

const styles = StyleSheet.create({
  groupedList: {
    flex: 1,
    backgroundColor: '#F2F2F7',
  },
  section: {
    marginTop: 35,
  },
  sectionHeader: {
    fontSize: 13,
    fontWeight: '400',
    color: '#6D6D72',
    textTransform: 'uppercase',
    marginLeft: 16,
    marginBottom: 8,
  },
  sectionContent: {
    backgroundColor: '#FFFFFF',
    borderRadius: 10,
    marginHorizontal: 16,
    overflow: 'hidden',
  },
  listRow: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingVertical: 12,
    paddingHorizontal: 16,
    minHeight: 44,
  },
  separator: {
    height: StyleSheet.hairlineWidth,
    backgroundColor: '#C6C6C8',
    marginLeft: 16,
  },
});

Navigation Patterns

Bottom Tab Bar

// Proper bottom tab sizing
const tabBarStyle = {
  height: Platform.OS === 'ios' ? 83 : 65, // Account for home indicator
  paddingBottom: Platform.OS === 'ios' ? 34 : 10,
  paddingTop: 10,
  backgroundColor: '#F8F8F8',
  borderTopWidth: StyleSheet.hairlineWidth,
  borderTopColor: '#C6C6C8',
};

// Tab item
const TabItem = ({ icon, label, active }) => (
  <View style={styles.tabItem}>
    <Icon name={icon} color={active ? '#007AFF' : '#8E8E93'} size={24} />
    <Text style={[
      styles.tabLabel,
      { color: active ? '#007AFF' : '#8E8E93' }
    ]}>
      {label}
    </Text>
  </View>
);

Header

// Large title header (iOS)
const LargeTitleHeader = ({ title, rightAction }) => {
  const insets = useSafeAreaInsets();

  return (
    <View style={[styles.header, { paddingTop: insets.top }]}>
      <View style={styles.headerContent}>
        <Text style={styles.largeTitle}>{title}</Text>
        {rightAction}
      </View>
    </View>
  );
};

const styles = StyleSheet.create({
  header: {
    backgroundColor: '#F8F8F8',
    borderBottomWidth: StyleSheet.hairlineWidth,
    borderBottomColor: '#C6C6C8',
  },
  headerContent: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    paddingHorizontal: 16,
    paddingBottom: 8,
  },
  largeTitle: {
    fontSize: 34,
    fontWeight: '700',
    letterSpacing: 0.37,
  },
});

Animations

Native Driver Animations

import { Animated } from 'react-native';

// Always use native driver when possible
const fadeIn = (value: Animated.Value) => {
  Animated.timing(value, {
    toValue: 1,
    duration: 200,
    useNativeDriver: true, // CRITICAL for performance
  }).start();
};

// Spring for natural feel
const bounce = (value: Animated.Value) => {
  Animated.spring(value, {
    toValue: 1,
    damping: 15,
    stiffness: 150,
    useNativeDriver: true,
  }).start();
};

Reanimated for Complex Animations

import Animated, {
  useSharedValue,
  useAnimatedStyle,
  withSpring,
} from 'react-native-reanimated';

const AnimatedCard = ({ children }) => {
  const scale = useSharedValue(1);

  const animatedStyle = useAnimatedStyle(() => ({
    transform: [{ scale: scale.value }],
  }));

  const onPressIn = () => {
    scale.value = withSpring(0.95);
  };

  const onPressOut = () => {
    scale.value = withSpring(1);
  };

  return (
    <Pressable onPressIn={onPressIn} onPressOut={onPressOut}>
      <Animated.View style={[styles.card, animatedStyle]}>
        {children}
      </Animated.View>
    </Pressable>
  );
};

Loading States

Skeleton Loader

const SkeletonLoader = ({ width, height, borderRadius = 4 }) => {
  const opacity = useSharedValue(0.3);

  useEffect(() => {
    opacity.value = withRepeat(
      withSequence(
        withTiming(1, { duration: 500 }),
        withTiming(0.3, { duration: 500 })
      ),
      -1,
      false
    );
  }, []);

  const animatedStyle = useAnimatedStyle(() => ({
    opacity: opacity.value,
  }));

  return (
    <Animated.View
      style={[
        { width, height, borderRadius, backgroundColor: '#E5E5EA' },
        animatedStyle,
      ]}
    />
  );
};

Activity Indicator

import { ActivityIndicator } from 'react-native';

// Use platform-native indicator
<ActivityIndicator size="large" color="#007AFF" />

// Button with loading state
const LoadingButton = ({ loading, title, onPress }) => (
  <Pressable
    onPress={onPress}
    disabled={loading}
    style={styles.button}
  >
    {loading ? (
      <ActivityIndicator color="#FFFFFF" />
    ) : (
      <Text style={styles.buttonText}>{title}</Text>
    )}
  </Pressable>
);

Accessibility

VoiceOver / TalkBack

// Accessible button
<Pressable
  onPress={onPress}
  accessible={true}
  accessibilityRole="button"
  accessibilityLabel="Submit form"
  accessibilityHint="Double tap to submit your information"
>
  <Text>Submit</Text>
</Pressable>

// Accessible image
<Image
  source={icon}
  accessible={true}
  accessibilityRole="image"
  accessibilityLabel="User profile picture"
/>

// Group related elements
<View
  accessible={true}
  accessibilityRole="summary"
  accessibilityLabel={`${name}, ${role}, ${status}`}
>
  <Text>{name}</Text>
  <Text>{role}</Text>
  <Text>{status}</Text>
</View>

Dynamic Type (iOS)

import { PixelRatio } from 'react-native';

// Scale fonts with system settings
const fontScale = PixelRatio.getFontScale();
const scaledFontSize = (size: number) => size * fontScale;

// Or use allowFontScaling
<Text allowFontScaling={true} style={{ fontSize: 17 }}>
  This text scales with system settings
</Text>

Anti-Patterns

Never Do

✗ Touch targets smaller than 44pt
✗ Text smaller than 12pt
✗ Hover states (no hover on mobile)
✗ Fixed heights that break with large text
✗ Ignoring safe areas
✗ Heavy shadows on Android (use elevation)
✗ White text on light backgrounds without checking contrast
✗ Non-native animations (JS-driven transforms)
✗ Ignoring platform conventions (iOS vs Android)
✗ Inline styles everywhere (use StyleSheet.create)

Common Mistakes

// ✗ Hardcoded dimensions that break accessibility
style={{ height: 40 }}  // Text might be larger

// ✓ Minimum height with padding
style={{ minHeight: 44, paddingVertical: 12 }}

// ✗ Shadow on Android
shadowColor: '#000'  // Won't work

// ✓ Platform-specific
...Platform.select({
  ios: { shadowColor: '#000', ... },
  android: { elevation: 4 },
})

// ✗ Fixed status bar height
paddingTop: 44

// ✓ Use safe area
paddingTop: insets.top

Quick Reference

Mobile Defaults

Touch targets: 44pt minimum
Font sizes: 12pt min, 17pt body, 34pt large title
Border radius: 10-14pt (iOS), 12-28pt (Android)
Spacing: 4/8/16/24/32 grid
Animations: 200-300ms, native driver
Shadow: iOS shadowOpacity 0.08-0.15, Android elevation 2-8

Premium Feel Checklist

□ All touch targets 44pt+
□ Consistent spacing (4pt grid)
□ Platform-appropriate styling
□ Safe area handling
□ Native animations (60fps)
□ Proper loading states
□ Dark mode support
□ Accessibility labels
□ Haptic feedback on actions
□ Pull-to-refresh where appropriate

FAQ

What does the ui-mobile skill do?

Mobile UI patterns - React Native, iOS/Android, touch targets

How do I install ui-mobile?

Run npx skills add https://github.com/alinaqi/maggy --skill ui-mobile in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/ui-mobile/ (personal) or .claude/skills/ui-mobile/ (project).

Which AI agents can use ui-mobile?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is ui-mobile safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains ui-mobile?

It is published by alinaqi in alinaqi/maggy. It has 1,179 recorded installs.

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