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2024 iThome 鐵人賽
DAY 15
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Mobile Development

從零開始學React Native系列 第 15 篇

【從零開始學React Native】14. 創建Todo Tracker——存儲資料在本地(二)

16th鐵人賽
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我們今天來創建存儲使用者在本地。

創建狀態和service

創建user service，並且登入部份我們先使用mock方法來模擬

// src\services\user.service.ts

import { MMKV } from 'react-native-mmkv';
import { User } from '../types';

const secureStorage = new MMKV({
  id: 'secure-user-storage',
  encryptionKey: 'secret-key',
});

const USER_KEY = 'user';
const IS_LOGGED_IN_KEY = 'isLoggedIn';
const TOKEN_KEY = 'token';

const mockApiCall = <T>(data: T): Promise<T> => {
  return new Promise((resolve) => {
    setTimeout(() => {
      resolve(data);
    }, 1000);
  });
};

export const UserService = {
  saveUser: (user: User) => {
    secureStorage.set(USER_KEY, JSON.stringify(user));
  },

  getUser: (): User | null => {
    const userJson = secureStorage.getString(USER_KEY);
    return userJson ? JSON.parse(userJson) : null;
  },

  setLoggedIn: (isLoggedIn: boolean) => {
    secureStorage.set(IS_LOGGED_IN_KEY, isLoggedIn);
  },

  isLoggedIn: (): boolean => {
    return secureStorage.getBoolean(IS_LOGGED_IN_KEY) || false;
  },

  saveToken: (token: string) => {
    secureStorage.set(TOKEN_KEY, token);
  },

  getToken: (): string | null => {
    return secureStorage.getString(TOKEN_KEY) || null;
  },

  clearUserData: () => {
    secureStorage.delete(USER_KEY);
    secureStorage.delete(IS_LOGGED_IN_KEY);
    secureStorage.delete(TOKEN_KEY);
  },

  login: async (email: string, password: string): Promise<User> => {
    const user: User = await mockApiCall({
      id: '1',
      username: email.split('@')[0],
      email: email,
      createdAt: new Date().toISOString(),
    });

    const token = 'mock-jwt-token';

    UserService.saveUser(user);
    UserService.setLoggedIn(true);
    UserService.saveToken(token);

    return user;
  },

  logout: () => {
    UserService.clearUserData();
  },
};

修改並添加user到我們的atom

// src\stores\atoms.ts
import { atom } from 'jotai';
import { Task, User } from '../types';
import { TaskService } from '../services/task.service';
import { UserService } from '../services/user.service';

export const userAtom = atom<User | null>(UserService.getUser());
export const isLoggedInAtom = atom<boolean>(UserService.isLoggedIn());
export const tokenAtom = atom<string | null>(UserService.getToken());
export const tasksAtom = atom<Task[]>(TaskService.getTasks());

創建登入頁面

接下來我們創建Login Page

// src\pages\login.page.tsx

import React, { useState } from 'react';
import { View, Text, TextInput, TouchableOpacity, StyleSheet, Alert } from 'react-native';
import { useSetAtom } from 'jotai';
import { userAtom, isLoggedInAtom } from '../stores/atoms';
import { UserService } from '../services/user.service';

type LoginPageProps = {
  navigation: any;
};

const LoginPage: React.FC<LoginPageProps> = ({ navigation }) => {
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');
  const setUser = useSetAtom(userAtom);
  const setIsLoggedIn = useSetAtom(isLoggedInAtom);

  const handleLogin = async () => {
    try {
      const user = await UserService.login(email, password);
      setUser(user);
      setIsLoggedIn(true);
      navigation.navigate('user');
    } catch (error) {
      Alert.alert('登錄失敗', '請檢查您的郵箱和密碼');
    }
  };

  return (
    <View style={styles.container}>
      <Text style={styles.title}>登錄</Text>
      <TextInput
        style={styles.input}
        placeholder="郵箱"
        value={email}
        onChangeText={setEmail}
        keyboardType="email-address"
        autoCapitalize="none"
      />
      <TextInput
        style={styles.input}
        placeholder="密碼"
        value={password}
        onChangeText={setPassword}
        secureTextEntry
      />
      <TouchableOpacity style={styles.loginButton} onPress={handleLogin}>
        <Text style={styles.loginButtonText}>登錄</Text>
      </TouchableOpacity>
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    padding: 20,
  },
  title: {
    fontSize: 24,
    fontWeight: 'bold',
    marginBottom: 20,
  },
  input: {
    width: '100%',
    height: 40,
    borderColor: 'gray',
    borderWidth: 1,
    borderRadius: 5,
    marginBottom: 10,
    paddingHorizontal: 10,
  },
  loginButton: {
    backgroundColor: '#007AFF',
    padding: 10,
    borderRadius: 5,
    width: '100%',
    alignItems: 'center',
  },
  loginButtonText: {
    color: 'white',
    fontSize: 16,
    fontWeight: 'bold',
  },
});

export default LoginPage;

並且在App上添加該page到nav，並稍微修正一下render page的方法。

// App.tsx

// ...
import UserPage from './src/pages/user.page';
import LoginPage from './src/pages/login.page';

function MainContent() {
  const [isDarkMode, setIsDarkMode] = useState(useColorScheme() === 'dark');
  const [currentPage, setCurrentPage] = useState('home');
  const [tasks, setTasks] = useState<Task[]>([]);
  const [selectedTask, setSelectedTask] = useState<Task | null>(null);
  const [user, setUser] = useAtom(userAtom);

  useEffect(() => {
    // 生成隨機任務當應用啟動時
    setTasks(generateRandomTasks(10));
    // 模擬用戶登入
    setUser({
      id: '1',
      username: 'JohnDoe',
      email: 'johndoe@example.com',
      createdAt: new Date().toISOString(),
    });
  }, []);

  const toggleDarkMode = () => {
    setIsDarkMode(!isDarkMode);
  };

  const generateRandomTasks = (count: number): Task[] => {
    const generateRandomDate = (start: Date, end: Date) => {
      return new Date(start.getTime() + Math.random() * (end.getTime() - start.getTime())).toISOString().split('T')[0];
    };

    const possibleTags: Tags[] = [
      { title: '工作' },
      { title: '個人' },
      { title: '學習' },
      { title: '娛樂' },
    ];

    for (let i = 0; i < count; i++) {
      const startDate = generateRandomDate(new Date(), new Date(Date.now() + 30 * 24 * 60 * 60 * 1000));
      const endDate = generateRandomDate(new Date(startDate), new Date(Date.now() + 60 * 24 * 60 * 60 * 1000));
      tasks.push({
        id: `task-${i + 1}`,
        title: `任務 ${i + 1}`,
        startDate,
        endDate,
        description: `隨機生成的第 ${i + 1} 筆內容。`,
        isDone: Math.random() < 0.3,
        tags: possibleTags.filter(() => Math.random() < 0.3),
        subTasks: [],
      });
    }
    return tasks;
  };

  const renderPage = () => {
    const navigation = {
      navigate: (pageName: string) => {
        setCurrentPage(pageName);
      }
    };
  
    switch (currentPage) {
      case 'home':
        return (
          <HomePage
            isDarkMode={isDarkMode}
            tasks={tasks}
            setTasks={setTasks}
            onTaskSelect={(task) => {
              setSelectedTask(task);
              setCurrentPage('taskDetails');
            }}
          />
        );
      case 'add':
        return <AddTaskPage isDarkMode={isDarkMode} />;
      case 'stats':
        return <StatisticsPage isDarkMode={isDarkMode} tasks={tasks} />;
      case 'user':
        return <UserPage navigation={navigation} />;
      case 'login':
        return <LoginPage navigation={navigation} />;
      case 'settings':
        return <SettingsPage isDarkMode={isDarkMode} toggleDarkMode={toggleDarkMode} navigation={navigation} />;
      case 'taskDetails':
        return selectedTask ? (
          <TaskDetailsPage
            isDarkMode={isDarkMode}
            task={selectedTask}
            onBack={() => setCurrentPage('home')}
          />
        ) : null;
      default:
        return <HomePage isDarkMode={isDarkMode} tasks={tasks} setTasks={setTasks} />;
    }
  };

  const backgroundStyle = {
    backgroundColor: isDarkMode ? Colors.darker : Colors.lighter,
    flex: 1,
  };

  return (
    <GestureHandlerRootView style={{ flex: 1 }}>
      <SafeAreaView style={backgroundStyle}>
        <StatusBar
          barStyle={isDarkMode ? 'light-content' : 'dark-content'}
          backgroundColor={backgroundStyle.backgroundColor}
        />
        <View style={styles.topArea}>
          <Text style={styles.topText}>我的應用</Text>
        </View>
        <View style={styles.container}>
          {renderPage()}
        </View>
        <View style={styles.bottomNav}>
          <TouchableOpacity style={styles.navItem} onPress={() => setCurrentPage('home')}>
            <Text style={styles.navText}>主頁</Text>
          </TouchableOpacity>
          <TouchableOpacity style={styles.navItem} onPress={() => setCurrentPage('add')}>
            <Text style={styles.navText}>新增</Text>
          </TouchableOpacity>
          <TouchableOpacity style={styles.navItem} onPress={() => setCurrentPage('stats')}>
            <Text style={styles.navText}>統計</Text>
          </TouchableOpacity>
          <TouchableOpacity style={styles.navItem} onPress={() => setCurrentPage('user')}>
            <Text style={styles.navText}>用戶</Text>
          </TouchableOpacity>
        </View>
      </SafeAreaView>
    </GestureHandlerRootView>
  );
}

function App(): React.JSX.Element {
  return (
    <SafeAreaProvider>
      <MainContent />
    </SafeAreaProvider>
  );
}

// ...

調整使用者頁面

接著調整User page，並且在未登入時可以點擊進行登入。

// src\pages\user.page.tsx
import React from 'react';
import { View, Text, StyleSheet, Image, TouchableOpacity, ScrollView } from 'react-native';
import { useAtom } from 'jotai';
import { userAtom, isLoggedInAtom } from '../stores/atoms';
import { UserService } from '../services/user.service';

type UserPageProps = {
  navigation: any;
};

const UserPage: React.FC<UserPageProps> = ({ navigation }) => {
  const [user, setUser] = useAtom(userAtom);
  const [isLoggedIn, setIsLoggedIn] = useAtom(isLoggedInAtom);

  const handleLogout = () => {
    UserService.logout();
    setUser(null);
    setIsLoggedIn(false);
  };

  if (!isLoggedIn) {
    return (
      <View style={styles.container}>
        <Text style={styles.title}>請先登入</Text>
        <TouchableOpacity
          style={styles.loginButton}
          onPress={() => navigation.navigate('login')}
        >
          <Text style={styles.loginButtonText}>登入</Text>
        </TouchableOpacity>
      </View>
    );
  }

  return (
    <ScrollView style={styles.container}>
      <View style={styles.profileHeader}>
        <Image
          source={{ uri: user?.avatar || 'https://via.placeholder.com/150' }}
          style={styles.avatar}
        />
        <Text style={styles.username}>{user?.username}</Text>
        <Text style={styles.email}>{user?.email}</Text>
      </View>

      <View style={styles.section}>
        <Text style={styles.sectionTitle}>用戶信息</Text>
        <View style={styles.infoItem}>
          <Text style={styles.infoLabel}>ID:</Text>
          <Text style={styles.infoValue}>{user?.id}</Text>
        </View>
        <View style={styles.infoItem}>
          <Text style={styles.infoLabel}>創建日期:</Text>
          <Text style={styles.infoValue}>{user?.createdAt ? new Date(user.createdAt).toLocaleDateString() : 'N/A'}</Text>
        </View>
      </View>

      <TouchableOpacity
        style={styles.settingsButton}
        onPress={() => navigation.navigate('settings')}
      >
        <Text style={styles.settingsButtonText}>設置</Text>
      </TouchableOpacity>

      <TouchableOpacity style={styles.logoutButton} onPress={handleLogout}>
        <Text style={styles.logoutButtonText}>登出</Text>
      </TouchableOpacity>
    </ScrollView>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    padding: 20,
  },
  title: {
    fontSize: 24,
    fontWeight: 'bold',
    marginBottom: 20,
    textAlign: 'center',
  },
  profileHeader: {
    alignItems: 'center',
    marginBottom: 20,
  },
  avatar: {
    width: 100,
    height: 100,
    borderRadius: 50,
    marginBottom: 10,
  },
  username: {
    fontSize: 24,
    fontWeight: 'bold',
    marginBottom: 5,
  },
  email: {
    fontSize: 16,
    color: '#666',
  },
  section: {
    marginBottom: 20,
  },
  sectionTitle: {
    fontSize: 18,
    fontWeight: 'bold',
    marginBottom: 10,
  },
  infoItem: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    marginBottom: 5,
  },
  infoLabel: {
    fontWeight: 'bold',
  },
  infoValue: {
    color: '#666',
  },
  settingsButton: {
    backgroundColor: '#007AFF',
    padding: 10,
    borderRadius: 5,
    alignItems: 'center',
    marginBottom: 10,
  },
  settingsButtonText: {
    color: 'white',
    fontSize: 16,
    fontWeight: 'bold',
  },
  loginButton: {
    backgroundColor: '#007AFF',
    padding: 10,
    borderRadius: 5,
    alignItems: 'center',
  },
  loginButtonText: {
    color: 'white',
    fontSize: 16,
    fontWeight: 'bold',
  },
  logoutButton: {
    backgroundColor: '#FF3B30',
    padding: 10,
    borderRadius: 5,
    alignItems: 'center',
  },
  logoutButtonText: {
    color: 'white',
    fontSize: 16,
    fontWeight: 'bold',
  },
});

export default UserPage;

心得

今天我們實現了簡易的使用者頁面和登入頁面，明天會先對所有的部分進行調整，並添加路由系統。


上一篇
【從零開始學React Native】13. 創建Todo Tracker——存儲資料在本地
下一篇
-【從零開始學React Native】15. 創建Todo Tracker——調整並新增路由
系列文
從零開始學React Native 共 20 篇
  1. 16
    -【從零開始學React Native】15. 創建Todo Tracker——調整並新增路由
  2. 17
    【從零開始學React Native】16. 什麼是BAAS
  3. 18
    【從零開始學React Native】17. 創建Todo Tracker——建構並架設parse server
  4. 19
    【從零開始學React Native】18. 創建Todo Tracker——app設置並連接到parse server (上)
  5. 20
    【從零開始學React Native】19. 創建Todo Tracker——app設置並連接到parse server (中)
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