water-sys/app/navigation/TabNavigator.tsx

import React, { useEffect, useState, useRef } from 'react';
import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
import { Platform, Modal, View, StyleSheet, Text, TouchableOpacity, Animated, Keyboard } from 'react-native';
import Ionicons from '@expo/vector-icons/Ionicons';
import { useNavigation, useRoute } from '@react-navigation/native';
import type { NativeStackNavigationProp } from '@react-navigation/native-stack';
import { RootStackParamList } from '../types/navigation';
import { useAuth } from '../contexts/AuthContext';
import { useTranslation } from 'react-i18next';

import { HomeScreen } from '../screens/HomeScreen';
import { CategoryScreen } from '../screens/CategoryScreen';
import { ChatScreen } from '../screens/ChatScreen';
import { CartScreen } from '../screens/CartScreen';
import { ProfileScreen } from '../screens/ProfileScreen';
type IconProps = {
  name: string;
  size: number;
  color: string;
};

const IconComponent = ({ name, size, color }: IconProps) => {
  const Icon = Ionicons as any;
  return <Icon name={name} size={size} color={color} />;
};

type TabBarIconProps = {
  color: string;
  size: number;
};

const Tab = createBottomTabNavigator();

export const TabNavigator = () => {
  const { t } = useTranslation();
  const navigation = useNavigation<NativeStackNavigationProp<RootStackParamList>>();
  const route = useRoute();
  const { isLoggedIn } = useAuth();
  const [showLoginPrompt, setShowLoginPrompt] = useState(false);
  const [keyboardVisible, setKeyboardVisible] = useState(false);
  
  // 动画值
  const fadeAnim = useRef(new Animated.Value(0)).current;
  const slideAnim = useRef(new Animated.Value(300)).current;

  // 监听键盘事件
  useEffect(() => {
    const keyboardDidShowListener = Keyboard.addListener(
      'keyboardDidShow',
      () => {
        setKeyboardVisible(true);
      }
    );
    const keyboardDidHideListener = Keyboard.addListener(
      'keyboardDidHide',
      () => {
        setKeyboardVisible(false);
      }
    );

    return () => {
      keyboardDidHideListener.remove();
      keyboardDidShowListener.remove();
    };
  }, []);

  // 检查登录状态
  useEffect(() => {
    // 如果是从 CountrySelect 页面来的，不显示登录提示
    if (route.name === 'CountrySelect') {
      return;
    }

    if (!isLoggedIn) {
      setShowLoginPrompt(true);
      Animated.parallel([
        Animated.timing(fadeAnim, {
          toValue: 1,
          duration: 300,
          useNativeDriver: true,
        }),
        Animated.spring(slideAnim, {
          toValue: 0,
          tension: 50,
          friction: 9,
          useNativeDriver: true,
        })
      ]).start();
    } else {
      // 如果已登录，关闭弹窗
      handleCloseModal();
    }
  }, [isLoggedIn, route.name]);

  const handleCloseModal = () => {
    Animated.parallel([
      Animated.timing(fadeAnim, {
        toValue: 0,
        duration: 200,
        useNativeDriver: true,
      }),
      Animated.timing(slideAnim, {
        toValue: 300,
        duration: 200,
        useNativeDriver: true,
      })
    ]).start(() => {
      setShowLoginPrompt(false);
    });
  };

  const handleGoToLogin = () => {
    handleCloseModal();
    navigation.navigate('Login');
  };

  return (
    <>
      <Tab.Navigator
        screenOptions={{
          tabBarActiveTintColor: '#0066FF',
          tabBarInactiveTintColor: '#999999',
          tabBarStyle: {
            height: Platform.OS === 'ios' ? 88 : 60,
            paddingBottom: Platform.OS === 'ios' ? 28 : 8,
            paddingTop: 8,
            backgroundColor: '#FFFFFF',
            borderTopWidth: 1,
            borderTopColor: '#F0F0F0',
            display: keyboardVisible ? 'none' : 'flex',
          },
          headerShown: false,
        }}
      >
        <Tab.Screen
          name="Home"
          component={HomeScreen}
          options={{
            tabBarLabel: '首页',
            tabBarIcon: ({ color, size }: TabBarIconProps) => (
              <IconComponent name="home-outline" size={size} color={color} />
            ),
          }}
        />
        <Tab.Screen
          name="Category"
          component={CategoryScreen}
          options={{
            tabBarLabel: '分类',
            tabBarIcon: ({ color, size }: TabBarIconProps) => (
              <IconComponent name="grid-outline" size={size} color={color} />
            ),
          }}
        />
        <Tab.Screen
          name="Chat"
          component={ChatScreen}
          options={{
            tabBarLabel: '聊天',
            tabBarIcon: ({ color, size }: TabBarIconProps) => (
              <IconComponent name="chatbubble-outline" size={size} color={color} />
            ),
          }}
        />
        <Tab.Screen
          name="Cart"
          component={CartScreen}
          options={{
            tabBarLabel: '购物车',
            tabBarIcon: ({ color, size }: TabBarIconProps) => (
              <IconComponent name="cart-outline" size={size} color={color} />
            ),
          }}
        />
        <Tab.Screen
          name="Profile"
          component={ProfileScreen}
          options={{
            tabBarLabel: '我的',
            tabBarIcon: ({ color, size }: TabBarIconProps) => (
              <IconComponent name="person-outline" size={size} color={color} />
            ),
          }}
        />
      </Tab.Navigator>

      <Modal
        visible={showLoginPrompt}
        transparent={true}
        animationType="none"
        statusBarTranslucent={true}
        onRequestClose={handleCloseModal}
      >
        <Animated.View 
          style={[
            styles.modalContainer,
            {
              opacity: fadeAnim,
            }
          ]}
        >
          <Animated.View 
            style={[
              styles.modalOverlay,
              {
                opacity: fadeAnim,
              }
            ]}
          >
            <TouchableOpacity 
              style={styles.modalOverlayTouch}
              activeOpacity={1}
              onPress={handleCloseModal}
            />
          </Animated.View>
          <Animated.View
            style={[
              styles.modalContent,
              {
                transform: [{ translateY: slideAnim }],
              },
            ]}
          >
            <TouchableOpacity 
              style={styles.closeButton}
              onPress={handleCloseModal}
            >
              <Text style={styles.closeButtonText}>✕</Text>
            </TouchableOpacity>
            <View style={styles.modalHeader}>
              <View style={styles.modalIndicator} />
            </View>
            <Text style={styles.modalTitle}>{t('welcomeTitle')}</Text>
            <Text style={styles.modalText}>
              {t('welcomeMessage')}
            </Text>
            <TouchableOpacity 
              style={styles.modalButton}
              onPress={handleGoToLogin}
            >
              <Text style={styles.modalButtonText}>{t('loginNow')}</Text>
            </TouchableOpacity>
          </Animated.View>
        </Animated.View>
      </Modal>
    </>
  );
};

const styles = StyleSheet.create({
  modalContainer: {
    flex: 1,
    justifyContent: 'flex-end',
  },
  modalOverlay: {
    ...StyleSheet.absoluteFillObject,
    backgroundColor: 'rgba(0, 0, 0, 0.5)',
  },
  modalOverlayTouch: {
    flex: 1,
  },
  modalContent: {
    backgroundColor: '#fff',
    borderTopLeftRadius: 24,
    borderTopRightRadius: 24,
    paddingHorizontal: 20,
    paddingBottom: Platform.OS === 'ios' ? 40 : 20,
    position: 'relative',
  },
  closeButton: {
    position: 'absolute',
    top: 20,
    right: 20,
    width: 24,
    height: 24,
    justifyContent: 'center',
    alignItems: 'center',
    zIndex: 1,
  },
  closeButtonText: {
    fontSize: 20,
    color: '#999',
  },
  modalHeader: {
    alignItems: 'center',
    paddingTop: 12,
    paddingBottom: 20,
  },
  modalIndicator: {
    width: 40,
    height: 4,
    backgroundColor: '#E0E0E0',
    borderRadius: 2,
  },
  modalTitle: {
    fontSize: 20,
    fontWeight: '600',
    color: '#000',
    textAlign: 'center',
    marginBottom: 12,
  },
  modalText: {
    fontSize: 16,
    color: '#666',
    textAlign: 'center',
    marginBottom: 24,
    lineHeight: 22,
  },
  modalButton: {
    backgroundColor: '#0066FF',
    height: 50,
    borderRadius: 25,
    justifyContent: 'center',
    alignItems: 'center',
  },
  modalButtonText: {
    color: '#fff',
    fontSize: 16,
    fontWeight: '600',
  },
});