【HarmonyOS】React Native实战项目+自定义Hooks开发指南

【HarmonyOS】React Native实战项目+自定义Hooks开发指南


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一、自定义Hook在OpenHarmony中的价值

React Hooks自React 16.8引入以来,彻底改变了组件状态管理的方式。在OpenHarmony平台开发中,精心设计的自定义Hook不仅能提升代码复用性,更能通过针对性的平台优化策略显著改善应用性能。

1.1 Hook设计原则对比

复制代码
┌─────────────────────────────────────────────────────────────┐
│              Hook设计原则演进                              │
├─────────────────────────────────────────────────────────────┤
│                                                           │
│  传统React Hook        OpenHarmony优化Hook                 │
│  ┌─────────────┐       ┌─────────────┐                 │
│  │关注点分离   │       │关注点分离   │                 │
│  │单一职责     │       │单一职责     │                 │
│  │可复用性     │       │可复用性     │                 │
│  └──────┬──────┘       └──────┬──────┘                 │
│         │                      │                          │
│         │    ┌────────────────┘                          │
│         │    │                                           │
│         ▼    ▼                                           │
│  ┌─────────────────────────┐                             │
│  │    OpenHarmony专项优化  │                             │
│  │  ┌─────────────────┐   │                             │
│  │  │平台适配处理     │   │                             │
│  │  │性能优化策略     │   │                             │
│  │  │内存管理机制     │   │                             │
│  │  │渲染优化技巧     │   │                             │
│  │  └─────────────────┘   │                             │
│  └─────────────────────────┘                             │
│                                                           │
│  核心差异:OpenHarmony优化Hook需要额外关注                │
│  • ArkUI渲染引擎特性                                      │
│  • 鸿蒙原生API集成                                       │
│  • 跨设备通信支持                                         │
└─────────────────────────────────────────────────────────────┘

1.2 OpenHarmony平台特性对Hook设计的影响

平台特性 对Hook设计的影响 推荐策略
异步渲染延迟 状态更新可能滞后 使用useRef存储中间值
文本嵌套限制 深度>8层性能下降 扁平化数据结构
内存回收激进 短生命周期对象频繁GC 缓存复用,避免频繁创建
原生API异步 需要Promise封装 createAsyncThunk模式
分布式数据 状态需跨设备同步 实现分布式状态Hook

二、Hook架构设计模式

2.1 基础Hook模板

typescript 复制代码
/**
 * OpenHarmony优化Hook基础模板
 * 提供统一的结构和最佳实践
 */
import { useState, useCallback, useEffect, useRef, useMemo } from 'react';

/**
 * Hook配置接口
 */
interface HookConfig<T, P> {
  /** 初始状态 */
  initialState: T;
  /** 处理函数 */
  handler: (value: T, params: P) => T | Promise<T>;
  /** 依赖项 */
  deps?: any[];
  /** 是否启用持久化 */
  persist?: boolean;
  /** 持久化键名 */
  persistKey?: string;
}

/**
 * 创建OpenHarmony优化Hook
 * @param config Hook配置
 * @returns [state, setState, additionalReturns]
 */
export function createOptimizedHook<T, P>(
  config: HookConfig<T, P>
) {
  const {
    initialState,
    handler,
    deps = [],
    persist = false,
    persistKey,
  } = config;

  return function useOptimizedHook(params: P) {
    // 1. 状态管理 - 使用useState
    const [state, setState] = useState<T>(() => {
      // 持久化恢复
      if (persist && persistKey) {
        const saved = loadFromHarmonyStorage<T>(persistKey);
        return saved !== null ? saved : initialState;
      }
      return initialState;
    });

    // 2. 中间值存储 - 使用useRef避免重渲染
    const stateRef = useRef(state);
    stateRef.current = state;

    // 3. 处理函数 - 使用 useCallback 优化
    const optimizedHandler = useCallback(async () => {
      const result = await handler(stateRef.current, params);

      setState(result);

      // 持久化保存
      if (persist && persistKey) {
        saveToHarmonyStorage(persistKey, result);
      }

      return result;
    }, [handler, params, persist, persistKey]);

    // 4. 清理函数
    useEffect(() => {
      return () => {
        // 清理资源
      };
    }, []);

    return [state, setState, optimizedHandler] as const;
  };
}

/**
 * OpenHarmony存储工具函数
 */
async function loadFromHarmonyStorage<T>(key: string): Promise<T | null> {
  try {
    // @ts-ignore
    const preferences = await ohosData.getPreferences(getContext(), 'hooks_state');
    const value = await preferences.get(key, null);
    return value as T;
  } catch {
    return null;
  }
}

async function saveToHarmonyStorage<T>(key: string, value: T): Promise<void> {
  try {
    // @ts-ignore
    const preferences = await ohosData.getPreferences(getContext(), 'hooks_state');
    await preferences.put(key, value);
    await preferences.flush();
  } catch (error) {
    console.warn('[Hook] Failed to persist state:', error);
  }
}

2.2 常用Hook模式库

typescript 复制代码
/**
 * OpenHarmony常用Hook模式库
 */

/**
 * 1. 防抖Hook - 针对频繁输入场景
 */
export function useDebounce<T>(value: T, delay: number = 300): T {
  const [debouncedValue, setDebouncedValue] = useState(value);

  useEffect(() => {
    const timer = setTimeout(() => {
      setDebouncedValue(value);
    }, delay);

    return () => clearTimeout(timer);
  }, [value, delay]);

  return debouncedValue;
}

/**
 * 2. 节流Hook - 针对高频事件场景
 */
export function useThrottle<T>(value: T, interval: number = 100): T {
  const [throttledValue, setThrottledValue] = useState(value);
  const lastExecutedRef = useRef(Date.now());

  useEffect(() => {
    const now = Date.now();
    const timePassed = now - lastExecutedRef.current;

    if (timePassed >= interval) {
      setThrottledValue(value);
      lastExecutedRef.current = now;
    } else {
      const timer = setTimeout(() => {
        setThrottledValue(value);
        lastExecutedRef.current = Date.now();
      }, interval - timePassed);

      return () => clearTimeout(timer);
    }
  }, [value, interval]);

  return throttledValue;
}

/**
 * 3. 尺寸监听Hook - OpenHarmony平台适配
 */
export function useDimensions() {
  const [dimensions, setDimensions] = useState(() => ({
    width: 0,
    height: 0,
  }));

  const onLayout = useCallback((event: any) => {
    const { width, height } = event.nativeEvent.layout;
    setDimensions({ width, height });
  }, []);

  return [dimensions, onLayout] as const;
}

/**
 * 4. 异步状态Hook - 统一处理loading/error
 */
interface AsyncState<T> {
  data: T | null;
  loading: boolean;
  error: string | null;
}

export function useAsync<T>() {
  const [state, setState] = useState<AsyncState<T>>({
    data: null,
    loading: false,
    error: null,
  });

  const execute = useCallback(async (promise: Promise<T>) => {
    setState({ data: null, loading: true, error: null });

    try {
      const data = await promise;
      setState({ data, loading: false, error: null });
      return data;
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : 'Unknown error';
      setState({ data: null, loading: false, error: errorMessage });
      throw error;
    }
  }, []);

  return [state, execute] as const;
}

/**
 * 5. 持久化状态Hook - OpenHarmony存储集成
 */
export function usePersistentState<T>(
  key: string,
  initialValue: T
): [T, (value: T) => void] {
  const [state, setState] = useState<T>(() => {
    // 尝试从存储恢复
    try {
      const saved = localStorage.getItem(key);
      return saved ? JSON.parse(saved) : initialValue;
    } catch {
      return initialValue;
    }
  });

  const setPersistentState = useCallback((value: T) => {
    setState(value);
    try {
      localStorage.setItem(key, JSON.stringify(value));
    } catch (error) {
      console.warn('[PersistentState] Failed to save:', error);
    }
  }, [key]);

  return [state, setPersistentState];
}

/**
 * 6. 生命周期Hook - 统一管理组件生命周期
 */
export function useLifecycle(
  onMount?: () => void | (() => void),
  onUpdate?: (prevDeps: any[]) => void,
  onUnmount?: () => void,
  deps: any[] = []
) {
  const prevDepsRef = useRef<any[]>([]);

  // Mount
  useEffect(() => {
    const cleanup = onMount?.();

    return () => {
      cleanup?.();
      onUnmount?.();
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  // Update
  useEffect(() => {
    if (prevDepsRef.current.length > 0) {
      onUpdate?.(prevDepsRef.current);
    }
    prevDepsRef.current = deps;
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, deps);
}

/**
 * 7. 间隔器Hook - 自动清理定时器
 */
export function useInterval(callback: () => void, delay: number | null) {
  const savedCallback = useRef(callback);

  useEffect(() => {
    savedCallback.current = callback;
  }, [callback]);

  useEffect(() => {
    if (delay === null) return;

    const timer = setInterval(() => {
      savedCallback.current();
    }, delay);

    return () => clearInterval(timer);
  }, [delay]);
}

/**
 * 8. 数组操作Hook - 常用列表处理
 */
export function useArray<T>(initialValue: T[] = []) {
  const [array, setArray] = useState<T[]>(initialValue);

  const push = useCallback((element: T) => {
    setArray(prev => [...prev, element]);
  }, []);

  const filter = useCallback((callback: (item: T, index: number) => boolean) => {
    setArray(prev => prev.filter(callback));
  }, []);

  const update = useCallback((index: number, newElement: T) => {
    setArray(prev => [
      ...prev.slice(0, index),
      newElement,
      ...prev.slice(index + 1),
    ]);
  }, []);

  const remove = useCallback((index: number) => {
    setArray(prev => [
      ...prev.slice(0, index),
      ...prev.slice(index + 1),
    ]);
  }, []);

  const clear = useCallback(() => setArray([]), []);

  return { array, set: setArray, push, filter, update, remove, clear };
}

/**
 * 9. 布尔状态Hook - 简化开关状态管理
 */
export function useBoolean(initialValue: boolean = false) {
  const [value, setValue] = useState(initialValue);

  const setTrue = useCallback(() => setValue(true), []);
  const setFalse = useCallback(() => setValue(false), []);
  const toggle = useCallback(() => setValue(v => !v), []);

  return {
    value,
    setValue,
    setTrue,
    setFalse,
    toggle,
  };
}

/**
 * 10. 网络状态Hook - OpenHarmony网络监听
 */
export function useNetworkStatus() {
  const [isOnline, setIsOnline] = useState(true);

  useEffect(() => {
    // OpenHarmony网络状态监听
    // @ts-ignore
    if (typeof ohosNet !== 'undefined') {
      // @ts-ignore
      const netManager = ohosNet.createNetConnection();

      const subscribe = () => {
        // @ts-ignore
        netManager.register((netType) => {
          setIsOnline(netType !== -1); // -1表示无网络
        });
      };

      subscribe();

      return () => {
        // @ts-ignore
        netManager.unregister();
      };
    }

    // 降级方案:浏览器事件
    const handleOnline = () => setIsOnline(true);
    const handleOffline = () => setIsOnline(false);

    window.addEventListener('online', handleOnline);
    window.addEventListener('offline', handleOffline);

    return () => {
      window.removeEventListener('online', handleOnline);
      window.removeEventListener('offline', handleOffline);
    };
  }, []);

  return isOnline;
}

/**
 * 11. 媒体查询Hook - 响应式布局支持
 */
export function useMediaQuery(query: string): boolean {
  const [matches, setMatches] = useState(() => {
    if (typeof window !== 'undefined') {
      return window.matchMedia(query).matches;
    }
    return false;
  });

  useEffect(() => {
    if (typeof window === 'undefined') return;

    const mediaQuery = window.matchMedia(query);
    const handler = (e: MediaQueryListEvent) => setMatches(e.matches);

    // 现代浏览器使用addEventListener
    if (mediaQuery.addEventListener) {
      mediaQuery.addEventListener('change', handler);
      return () => mediaQuery.removeEventListener('change', handler);
    }
    // 降级方案
    else {
      mediaQuery.addListener(handler);
      return () => mediaQuery.removeListener(handler);
    }
  }, [query]);

  return matches;
}

/**
 * 12. 前一次值Hook - 比较状态变化
 */
export function usePrevious<T>(value: T): T | undefined {
  const ref = useRef<T>();

  useEffect(() => {
    ref.current = value;
  }, [value]);

  return ref.current;
}

三、OpenHarmony平台性能优化

3.1 Hook性能分析框架

typescript 复制代码
/**
 * Hook性能分析器 - OpenHarmony专用
 */
class HookPerformanceAnalyzer {
  private metrics = new Map<string, PerformanceMetric>();

  /**
   * 记录Hook执行时间
   */
  measure<T>(hookName: string, fn: () => T): T {
    const startTime = performance.now();
    const result = fn();
    const endTime = performance.now();

    this.recordMetric(hookName, endTime - startTime);

    return result;
  }

  /**
   * 记录性能指标
   */
  private recordMetric(hookName: string, duration: number) {
    if (!this.metrics.has(hookName)) {
      this.metrics.set(hookName, {
        totalTime: 0,
        callCount: 0,
        avgTime: 0,
        maxTime: 0,
      });
    }

    const metric = this.metrics.get(hookName)!;
    metric.totalTime += duration;
    metric.callCount += 1;
    metric.avgTime = metric.totalTime / metric.callCount;
    metric.maxTime = Math.max(metric.maxTime, duration);

    // OpenHarmony性能警告阈值
    if (duration > 16) { // 超过一帧(60fps)
      console.warn(`[Performance] ${hookName} took ${duration.toFixed(2)}ms`);
    }
  }

  /**
   * 获取性能报告
   */
  getReport(): PerformanceReport {
    return {
      hooks: Array.from(this.metrics.entries()).map(([name, metric]) => ({
        name,
        ...metric,
      })),
      summary: this.getSummary(),
    };
  }

  private getSummary() {
    const entries = Array.from(this.metrics.values());
    return {
      totalCalls: entries.reduce((sum, m) => sum + m.callCount, 0),
      totalTime: entries.reduce((sum, m) => sum + m.totalTime, 0),
      slowestHook: Array.from(this.metrics.entries())
        .sort(([, a], [, b]) => b.maxTime - a.maxTime)[0]?.[0],
    };
  }
}

interface PerformanceMetric {
  totalTime: number;
  callCount: number;
  avgTime: number;
  maxTime: number;
}

interface PerformanceReport {
  hooks: Array<{ name: string } & PerformanceMetric>;
  summary: {
    totalCalls: number;
    totalTime: number;
    slowestHook: string | undefined;
  };
}

3.2 内存优化策略

复制代码
┌─────────────────────────────────────────────────────────────┐
│            OpenHarmony Hook内存优化策略                       │
├─────────────────────────────────────────────────────────────┤
│                                                           │
│  优化方向              实现方式              预期收益      │
│  ─────────         ────────────────        ──────────    │
│  对象复用          useMemo缓存            减少30%内存      │
│  引用保存          useRef存储            减少50%GC       │
│  清理时机          useEffect cleanup       避免内存泄漏     │
│  依赖优化          useCallback deps       减少40%重渲染    │
│  惰性初始化        函数初始状态          减少20%启动时间  │
│  结构共享          Immer不可变更新      节省60%内存     │
└─────────────────────────────────────────────────────────────┘

3.3 渲染优化最佳实践

typescript 复制代码
/**
 * 渲染优化Hook集合
 */

/**
 * 1. 深比较Memo - 针对复杂对象
 */
export function useDeepMemo<T>(value: T, deps: any[] = []): T {
  const ref = useRef<{ value: T; deps: any[] }>({
    value,
    deps,
  });

  // 深比较依赖
  const hasChanged = !deepEqual(ref.current.deps, deps);

  if (hasChanged) {
    ref.current = { value, deps };
  }

  return ref.current.value;
}

function deepEqual(a: any, b: any): boolean {
  if (a === b) return true;

  if (typeof a !== typeof b) return false;
  if (typeof a !== 'object') return false;

  const keysA = Object.keys(a);
  const keysB = Object.keys(b);

  if (keysA.length !== keysB.length) return false;

  return keysA.every(key => deepEqual(a[key], b[key]));
}

/**
 * 2. 虚拟列表Hook - 长列表性能优化
 */
export function useVirtualList<T>(
  items: T[],
  itemHeight: number,
  containerHeight: number
) {
  const [scrollTop, setScrollTop] = useState(0);

  const visibleStart = Math.floor(scrollTop / itemHeight);
  const visibleEnd = Math.min(
    visibleStart + Math.ceil(containerHeight / itemHeight) + 1,
    items.length
  );

  const visibleItems = useMemo(
    () => items.slice(visibleStart, visibleEnd),
    [items, visibleStart, visibleEnd]
  );

  const totalHeight = items.length * itemHeight;
  const offsetY = visibleStart * itemHeight;

  return {
    visibleItems,
    totalHeight,
    offsetY,
    onScroll: (e: any) => setScrollTop(e.nativeEvent.contentOffset.y),
  };
}

/**
 * 3. 批量更新Hook - 减少setState调用
 */
export function useBatchUpdate<T>(initialState: T) {
  const [state, setState] = useState<T>(initialState);
  const pendingUpdatesRef = useRef<Partial<T>>({});
  const timeoutRef = useRef<NodeJS.Timeout>();

  const batchSetState = useCallback((updates: Partial<T>) => {
    // 合并更新
    Object.assign(pendingUpdatesRef.current, updates);

    // 清除之前的定时器
    if (timeoutRef.current) {
      clearTimeout(timeoutRef.current);
    }

    // 延迟批量应用
    timeoutRef.current = setTimeout(() => {
      setState(prev => ({ ...prev, ...pendingUpdatesRef.current }));
      pendingUpdatesRef.current = {};
    }, 0);
  }, []);

  useEffect(() => {
    return () => {
      if (timeoutRef.current) {
        clearTimeout(timeoutRef.current);
      }
    };
  }, []);

  return [state, batchSetState] as const;
}

四、完整应用示例

typescript 复制代码
/**
 * HooksDemoScreen - 自定义Hooks综合演示
 */
import React, { useState } from 'react';
import {
  View,
  Text,
  StyleSheet,
  ScrollView,
  TouchableOpacity,
  TextInput,
} from 'react-native';
import {
  useDebounce,
  useBoolean,
  useArray,
  useMediaQuery,
  useNetworkStatus,
} from '../hooks';

export function HooksDemoScreen({ onBack }: { onBack: () => void }) {
  // useDebounce演示
  const [inputValue, setInputValue] = useState('');
  const debouncedValue = useDebounce(inputValue, 500);

  // useBoolean演示
  const { value: isToggled, toggle, setTrue, setFalse } = useBoolean(false);

  // useArray演示
  const {
    array: items,
    push,
    remove,
    clear
  } = useArray(['Item 1', 'Item 2']);

  // useMediaQuery演示
  const isMobile = useMediaQuery('(max-width: 768px)');

  // useNetworkStatus演示
  const isOnline = useNetworkStatus();

  return (
    <View style={styles.container}>
      <View style={styles.header}>
        <TouchableOpacity onPress={onBack}>
          <Text style={styles.backBtn}>← 返回</Text>
        </TouchableOpacity>
        <Text style={styles.title}>自定义Hooks</Text>
      </View>

      <ScrollView style={styles.content}>
        {/* 防抖Hook演示 */}
        <View style={styles.card}>
          <Text style={styles.cardTitle}>useDebounce</Text>
          <View style={styles.demoSection}>
            <TextInput
              style={styles.input}
              value={inputValue}
              onChangeText={setInputValue}
              placeholder="输入内容(500ms防抖)"
            />
            <View style={styles.resultBox}>
              <Text style={styles.resultLabel}>原始值:</Text>
              <Text style={styles.resultValue}>{inputValue || '-'}</Text>
            </View>
            <View style={styles.resultBox}>
              <Text style={styles.resultLabel}>防抖值:</Text>
              <Text style={styles.resultValue}>
                {debouncedValue || '-'}
              </Text>
            </View>
          </View>
        </View>

        {/* 布尔Hook演示 */}
        <View style={styles.card}>
          <Text style={styles.cardTitle}>useBoolean</Text>
          <View style={styles.demoSection}>
            <View style={[
              styles.toggleIndicator,
              isToggled && styles.toggleIndicatorOn
            ]}>
              <Text style={styles.toggleText}>
                {isToggled ? 'ON' : 'OFF'}
              </Text>
            </View>
            <View style={styles.buttonRow}>
              <TouchableOpacity style={styles.button} onPress={toggle}>
                <Text style={styles.buttonText}>Toggle</Text>
              </TouchableOpacity>
              <TouchableOpacity style={styles.button} onPress={setTrue}>
                <Text style={styles.buttonText}>Set True</Text>
              </TouchableOpacity>
              <TouchableOpacity style={styles.button} onPress={setFalse}>
                <Text style={styles.buttonText}>Set False</Text>
              </TouchableOpacity>
            </View>
          </View>
        </View>

        {/* 数组Hook演示 */}
        <View style={styles.card}>
          <Text style={styles.cardTitle}>useArray</Text>
          <View style={styles.demoSection}>
            <View style={styles.list}>
              {items.map((item, index) => (
                <View key={index} style={styles.listItem}>
                  <Text style={styles.listItemText}>{item}</Text>
                  <TouchableOpacity
                    style={styles.removeBtn}
                    onPress={() => remove(index)}
                  >
                    <Text style={styles.removeBtnText}>×</Text>
                  </TouchableOpacity>
                </View>
              ))}
            </View>
            <View style={styles.buttonRow}>
              <TouchableOpacity
                style={styles.button}
                onPress={() => push(`Item ${items.length + 1}`)}
              >
                <Text style={styles.buttonText}>Add Item</Text>
              </TouchableOpacity>
              <TouchableOpacity style={styles.button} onPress={clear}>
                <Text style={styles.buttonText}>Clear All</Text>
              </TouchableOpacity>
            </View>
          </View>
        </View>

        {/* 媒体查询Hook演示 */}
        <View style={styles.card}>
          <Text style={styles.cardTitle}>useMediaQuery</Text>
          <View style={styles.demoSection}>
            <View style={[
              styles.statusBox,
              isMobile && styles.statusBoxMobile
            ]}>
              <Text style={styles.statusText}>
                {isMobile ? '📱 移动端' : '🖥️ 桌面端'}
              </Text>
            </View>
            <Text style={styles.infoText}>
              窗口宽度: {isMobile ? '<= 768px' : '> 768px'}
            </Text>
          </View>
        </View>

        {/* 网络状态Hook演示 */}
        <View style={styles.card}>
          <Text style={styles.cardTitle}>useNetworkStatus</Text>
          <View style={styles.demoSection}>
            <View style={[
              styles.statusBox,
              isOnline ? styles.statusBoxOnline : styles.statusBoxOffline
            ]}>
              <Text style={styles.statusText}>
                {isOnline ? '🟢 在线' : '🔴 离线'}
              </Text>
            </View>
          </View>
        </View>
      </ScrollView>
    </View>
  );
}

const styles = StyleSheet.create({
  container: { flex: 1, backgroundColor: '#f5f5f5' },
  header: {
    flexDirection: 'row',
    alignItems: 'center',
    padding: 16,
    paddingTop: 48,
    backgroundColor: '#9C27B0',
  },
  backBtn: { color: '#fff', fontSize: 16, fontWeight: '600' },
  title: {
    flex: 1,
    color: '#fff',
    fontSize: 18,
    fontWeight: '700',
    textAlign: 'center',
  },
  content: { flex: 1, padding: 16 },
  card: {
    backgroundColor: '#fff',
    borderRadius: 12,
    padding: 16,
    marginBottom: 16,
    shadowColor: '#000',
    shadowOffset: { width: 0, height: 2 },
    shadowOpacity: 0.1,
    shadowRadius: 4,
    elevation: 3,
  },
  cardTitle: {
    fontSize: 18,
    fontWeight: '700',
    color: '#333',
    marginBottom: 16,
  },
  demoSection: { gap: 12 },
  input: {
    height: 48,
    backgroundColor: '#f8f8f8',
    borderRadius: 8,
    paddingHorizontal: 16,
    fontSize: 14,
    borderWidth: 1,
    borderColor: '#e0e0e0',
  },
  resultBox: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    backgroundColor: '#f8f8f8',
    borderRadius: 8,
    padding: 12,
  },
  resultLabel: { fontSize: 13, color: '#888' },
  resultValue: { fontSize: 14, fontWeight: '600', color: '#333' },
  toggleIndicator: {
    height: 60,
    borderRadius: 8,
    backgroundColor: '#f0f0f0',
    alignItems: 'center',
    justifyContent: 'center',
  },
  toggleIndicatorOn: { backgroundColor: '#9C27B0' },
  toggleText: {
    fontSize: 20,
    fontWeight: '700',
    color: '#333',
  },
  buttonRow: { flexDirection: 'row', gap: 10 },
  button: {
    flex: 1,
    paddingVertical: 10,
    backgroundColor: '#9C27B0',
    borderRadius: 8,
    alignItems: 'center',
  },
  buttonText: { fontSize: 14, fontWeight: '600', color: '#fff' },
  list: { gap: 8, marginBottom: 12 },
  listItem: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    backgroundColor: '#f8f8f8',
    borderRadius: 8,
    paddingHorizontal: 16,
    paddingVertical: 12,
  },
  listItemText: { fontSize: 14, color: '#333' },
  removeBtn: {
    width: 24,
    height: 24,
    borderRadius: 12,
    backgroundColor: '#e0e0e0',
    alignItems: 'center',
    justifyContent: 'center',
  },
  removeBtnText: { fontSize: 16, color: '#666', fontWeight: '700' },
  statusBox: {
    height: 60,
    borderRadius: 8,
    alignItems: 'center',
    justifyContent: 'center',
  },
  statusBoxMobile: { backgroundColor: '#E3F2FD' },
  statusBoxOnline: { backgroundColor: '#E8F5E9' },
  statusBoxOffline: { backgroundColor: '#FFEBEE' },
  statusText: {
    fontSize: 16,
    fontWeight: '700',
    color: '#333',
  },
  infoText: {
    fontSize: 13,
    color: '#888',
    textAlign: 'center',
  },
});

五、最佳实践总结

5.1 Hook设计检查清单

检查项 说明 优先级
✅ 单一职责 Hook只负责一个功能点 必须实现
✅ 参数验证 验证输入参数合法性 强烈推荐
✅ 错误处理 优雅处理异常情况 强烈推荐
✅ 内存清理 useEffect返回清理函数 必须实现
✅ 性能优化 使用useMemo/useCallback 推荐实现
✅ TypeScript类型 完整的类型定义 必须实现
✅ 文档注释 JSDoc格式文档 推荐实现

5.2 OpenHarmony特定建议

  1. 避免深度嵌套:文本组件嵌套不超过8层
  2. 使用useRef:存储不触发渲染的中间值
  3. 防抖输入:所有用户输入都应考虑防抖
  4. 持久化策略:关键状态应持久化到鸿蒙存储
  5. 网络状态:使用useNetworkStatus监听网络变化

六、项目源码

完整项目Demo : AtomGitDemos

技术栈:

  • React Native 0.72.5
  • OpenHarmony 6.0.0 (API 20)
  • TypeScript 4.8.4

社区支持 : 开源鸿蒙跨平台社区


📕个人领域 :Linux/C++/java/AI

🚀 个人主页有点流鼻涕 · CSDN

💬 座右铭 : "向光而行,沐光而生。"

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