import
React, { useRef, useEffect, useState, useCallback, useMemo } from '
react';
import {
View,
Image,
FlatList,
TouchableOpacity,
StyleSheet,
Dimensions,
Platform,
StyleProp,
ViewStyle,
ViewToken,
NativeSyntheticEvent,
NativeScrollEvent,
GestureResponderEvent,
} from '
react-native';
import { Uri } from 'base/navigator/Uri';
// 设计稿基础参数
const DESIGN_PIT_WIDTH = 320;
const DESIGN_PIT_HEIGHT = 300;
const OUTER_PADDING = 16; // 左右外边距，从30调整为16
const GAP = 16; // 坑之间间距，从30调整为16
const PIT_RADIUS = 18; // 单坑圆角
const AUTO_SCROLL_INTERVAL = 3000;
const { width: screenWidth } = Dimensions.get('window');
// 动态计算单坑宽高（适配不同
屏幕）
const pitWidth = (screenWidth
- OUTER_PADDING * 2
- GAP * 2) / 3;
const pitHeight = pitWidth * DESIGN_PIT_HEIGHT / DESIGN_PIT_WIDTH;
interface PitItem {
image_url: string;
jump_config?: {
[key: string]: any;
};
[key: string]: any;
}
interface HomeSmallPitBannerProps {
data: PitItem[];
bgColor?: string;
bgImage?: string;
onPitPress?: (item: PitItem, index: number) => void;
style?: StyleProp<ViewStyle>;
scrollY?: number; // 新增：父组件传入的 scrollY
}
const HomeSmallPitBanner:
React.FC<HomeSmallPitBannerProps> = (props) => {
// 兼容新老
数据结构
const rawData: any = props.data;
let data: PitItem[] = [];
let bgColor = props.bgColor;
let bgImage = props.bgImage;
if (Array.isArray(rawData)) {
data = rawData;
} else if (rawData && typeof rawData === 'object') {
// 新mock结构：floor.data.data.jianyu_list 或 floor.data.jianyu_list
data = rawData.data?.jianyu_list || rawData.jianyu_list || [];
bgColor = rawData.data?.config?.bg_color || rawData.config?.bg_color || bgColor;
bgImage = rawData.data?.config?.floorBgImg || rawData.config?.floorBgImg || bgImage;
}
const [currentIndex, setCurrentIndex] = useState(0);
const [isVisible, setIsVisible] = useState(true);
const [isManualScrolling, setIsManualScrolling] = useState(false);
const [isTouching, setIsTouching] = useState(false);
const
flatListRef = useRef<
FlatList<PitItem> | null>(null);
const timerRef = useRef<NodeJS.Timeout | null>(null);
const currentIndexRef = useRef(0);
const isScrollingRef = useRef(false);
const isJumpingRef = useRef(false);
const bannerRef = useRef<View | null>(null);
const originalDataLengthRef = useRef(data.length);
const [bannerLayout, setBannerLayout] = useState({ pageY: 0, height: 0 });
// 触摸事件处理
- 通知父组件
const handleTouchStart = () => {
setIsTouching(true);
// 通知父组件轮播开始触摸
if (global.carouselTouchHandler) {
global.carouselTouchHandler(true);
}
};
const handleTouchEnd = () => {
setIsTouching(false);
// 通知父组件轮播结束触摸
if (global.carouselTouchHandler) {
global.carouselTouchHandler(false);
}
};
// 无缝滚动：采用复制首尾元素的方法，实现真正的无缝循环
const seamlessData = useMemo(() => {
if (data.length === 0) return [];
if (data.length <= 3) return data;
// 更新原始
数据长度引用
originalDataLengthRef.current = data.length;
// 前面拼接最后3个
数据（尾部元素复制到头部）
const frontDuplicatedItems = data
.slice(
-3)
.map((item, index) => ({
...item,
_duplicated: true,
_originalIndex: data.length
- 3 + index,
_isFrontDuplicated: true,
}));
// 后面拼接前3个
数据（首部元素复制到尾部）
const backDuplicatedItems = data
.slice(0, 3)
.map((item, index) => ({
...item,
_duplicated: true,
_originalIndex: index,
_isBackDuplicated: true,
}));
return [...frontDuplicatedItems, ...data, ...backDuplicatedItems];
}, [data]);
useEffect(() => {
currentIndexRef.current = currentIndex;
}, [currentIndex]);
// 用 onLayout + scrollY 实
时检测可见性
useEffect(() => {
if (typeof props.scrollY !== 'number') return;
const windowHeight = Dimensions.get('window').height;
const { pageY, height } = bannerLayout;
// 只要有
一部分在
屏幕内就算可见
const visible = pageY + height > props.scrollY && pageY < props.scrollY + windowHeight;
setIsVisible(visible);
}, [props.scrollY, bannerLayout]);
// 监听可见性：不可见
时暂停轮播
const handleViewableItemsChanged = useCallback(
({ viewableItems }: { viewableItems: ViewToken[] }) => {
const visible = viewableItems.some((item) => item.isViewable);
setIsVisible(visible);
},
[]
);
// 边界跳转逻辑
- 采用复制首尾元素的方法
const handleEdgeJump = useCallback((index: number) => {
if (seamlessData.length > 3) {
if (index < 3) {
// 滚动到头部复制品，无过渡跳回真实最后
一张
flatListRef.current?.scrollToOffset({
offset: (data.length + 3
- 1) * (pitWidth + GAP),
animated: false,
});
setCurrentIndex(data.length
- 1);
currentIndexRef.current = data.length
- 1;
return true;
} else if (index >= data.length + 3) {
// 滚动到尾部复制品，无过渡跳回真实第
一张
flatListRef.current?.scrollToOffset({
offset: 3 * (pitWidth + GAP),
animated: false,
});
setCurrentIndex(0);
currentIndexRef.current = 0;
return true;
}
}
return false;
}, [data.length, pitWidth, GAP, seamlessData.length]);
// 自动轮播
- 优化版本，参考文章实现真正的无缝轮播
const startAutoScroll = useCallback(() => {
if (timerRef.current) clearInterval(timerRef.current);
if (seamlessData.length <= 3 || !isVisible || isTouching || isManualScrolling) return;
timerRef.current = setInterval(() => {
if (isScrollingRef.current || isJumpingRef.current || isTouching || isManualScrolling) return;
let nextIndex = currentIndexRef.current + 1;
if (nextIndex >= data.length) nextIndex = 0;
// 直接滚动到下
一个位置，无缝轮播
const targetOffset = (nextIndex + 3) * (pitWidth + GAP);
flatListRef.current?.scrollToOffset({
offset: targetOffset,
animated: true,
});
setCurrentIndex(nextIndex);
currentIndexRef.current = nextIndex;
}, AUTO_SCROLL_INTERVAL);
}, [seamlessData.length, isVisible, isTouching, isManualScrolling, pitWidth, data.length, GAP]);
// 监听可见性变化，自动暂停/恢复轮播
useEffect(() => {
if (timerRef.current) {
clearInterval(timerRef.current);
timerRef.current = null;
}
if (isVisible) {
startAutoScroll();
}
// 不可见
时自动暂停，无需额外处理
return () => {
if (timerRef.current) {
clearInterval(timerRef.current);
timerRef.current = null;
}
};
}, [isVisible, startAutoScroll]);
// 滚动事件：更新当前索引
const handleScroll = useCallback(
(event:
NativeSyntheticEvent<
NativeScrollEvent>) => {
if (isJumpingRef.current) return;
const offsetX = event.
nativeEvent.contentOffset.x;
const index = Math.round(offsetX / (pitWidth + GAP));
if (handleEdgeJump(index)) return;
// 只处理有效的索引范围
if (index >= 0 && index < seamlessData.length) {
if (index >= 3 && index < data.length + 3) {
const actualIndex = (index
- 3 + data.length) % data.length;
if (actualIndex !== currentIndex) {
setCurrentIndex(actualIndex);
currentIndexRef.current = actualIndex;
}
}
}
},
[currentIndex, seamlessData.length, pitWidth, handleEdgeJump, data.length]
);
// 手动拖动开始：暂停自动轮播
const handleScrollBegin = useCallback(() => {
isScrollingRef.current = true;
setIsManualScrolling(true);
setIsTouching(true);
// 通知父组件轮播开始触摸
if (global.carouselTouchHandler) {
global.carouselTouchHandler(true);
}
// 立即清除定
时器
if (timerRef.current) {
clearInterval(timerRef.current);
timerRef.current = null;
}
}, []);
// 手动拖动结束：恢复自动轮播
- 优化版本
const handleScrollEnd = useCallback((event) => {
isScrollingRef.current = false;
setIsManualScrolling(false);
setIsTouching(false);
if (global.carouselTouchHandler) {
global.carouselTouchHandler(false);
}
const offsetX = event?.
nativeEvent?.contentOffset?.x ?? 0;
const index = Math.round(offsetX / (pitWidth + GAP));
handleEdgeJump(index);
// 减少延迟
时间，提升响应性
setTimeout(() => {
if (timerRef.current) clearInterval(timerRef.current);
if (seamlessData.length <= 3 || !isVisible) return;
timerRef.current = setInterval(() => {
if (isScrollingRef.current || isJumpingRef.current || isTouching || isManualScrolling) return;
let nextIndex = currentIndexRef.current + 1;
if (nextIndex >= data.length) nextIndex = 0;
const targetOffset = (nextIndex + 3) * (pitWidth + GAP);
flatListRef.current?.scrollToOffset({
offset: targetOffset,
animated: true,
});
setCurrentIndex(nextIndex);
currentIndexRef.current = nextIndex;
}, AUTO_SCROLL_INTERVAL);
}, 300); // 减少延迟
时间
}, [seamlessData.length, isVisible, pitWidth, handleEdgeJump, data.length]);
// 动量滚动开始：暂停自动轮播
const handleMomentumScrollBegin = useCallback(() => {
isScrollingRef.current = true;
setIsManualScrolling(true);
setIsTouching(true);
// 通知父组件轮播开始触摸
if (global.carouselTouchHandler) {
global.carouselTouchHandler(true);
}
if (timerRef.current) {
clearInterval(timerRef.current);
timerRef.current = null;
}
}, []);
// 动量滚动结束：恢复自动轮播
- 优化版本
const handleMomentumScrollEnd = useCallback((event) => {
isScrollingRef.current = false;
setIsManualScrolling(false);
setIsTouching(false);
if (global.carouselTouchHandler) {
global.carouselTouchHandler(false);
}
const offsetX = event?.
nativeEvent?.contentOffset?.x ?? 0;
const index = Math.round(offsetX / (pitWidth + GAP));
handleEdgeJump(index);
// 减少延迟
时间，提升响应性
setTimeout(() => {
if (timerRef.current) clearInterval(timerRef.current);
if (seamlessData.length <= 3 || !isVisible) return;
timerRef.current = setInterval(() => {
if (isScrollingRef.current || isJumpingRef.current || isTouching || isManualScrolling) return;
let nextIndex = currentIndexRef.current + 1;
if (nextIndex >= data.length) nextIndex = 0;
const targetOffset = (nextIndex + 3) * (pitWidth + GAP);
flatListRef.current?.scrollToOffset({
offset: targetOffset,
animated: true,
});
setCurrentIndex(nextIndex);
currentIndexRef.current = nextIndex;
}, AUTO_SCROLL_INTERVAL);
}, 200); // 进
一步减少延迟
时间
}, [seamlessData.length, isVisible, pitWidth, handleEdgeJump, data.length]);
// 渲染单个坑位（只显示图片）
const renderPit = useCallback(
({ item, index }: { item: PitItem & { _duplicated?: boolean; _originalIndex?: number; _isFrontDuplicated?: boolean; _isBackDuplicated?: boolean }; index: number }) => (
<TouchableOpacity
style={[
styles.pitContainer,
{
width: pitWidth,
height: pitHeight,
marginRight: index !== seamlessData.length
- 1 ? GAP : 0,
// 硬件加速优化
- 使用兼容的transform
transform: [{ translateX: 0 }],
},
]}
activeOpacity={0.85}
onPress={() => Uri.openUri(1, item.jump_config?.url)}
>
<Image
source={{ uri: item.image_url }}
style={[
styles.pitImage,
// 硬件加速优化
- 使用兼容的transform
{ transform: [{ translateX: 0 }] }
]}
resizeMode="contain"
/>
</TouchableOpacity>
),
[pitWidth, pitHeight, seamlessData.length]
);
// 唯
一 key 生成
const keyExtractor = useCallback(
(item: PitItem & { _duplicated?: boolean; _originalIndex?: number; _isFrontDuplicated?: boolean; _isBackDuplicated?: boolean }, index: number) => {
if (item._isFrontDuplicated) {
return `front
-${item._originalIndex}
-${index}`;
}
if (item._isBackDuplicated) {
return `back
-${item._originalIndex}
-${index}`;
}
return `original
-${index}`;
},
[]
);
// 初始化
时滚动到正确位置（第4个位置，即原始
数据的第1个）
useEffect(() => {
if (seamlessData.length > 3) {
setTimeout(() => {
flatListRef.current?.scrollToOffset({
offset: 3 * (pitWidth + GAP),
animated: false,
});
}, 100);
}
}, [seamlessData.length, pitWidth]);
return (
<View
ref={bannerRef}
style={props.style}
onLayout={e => {
// 使用 onLayout 事件直接获取布局信息，避免 UIManager.measure 回调泄漏
const { y, height } = e.
nativeEvent.layout;
setBannerLayout({ pageY: y, height });
}}
>
{bgImage && (
<Image
source={{ uri: bgImage }}
style={styles.bgImage}
resizeMode="cover"
/>
)}
<
FlatList
ref={
flatListRef}
data={seamlessData}
renderItem={renderPit}
keyExtractor={keyExtractor}
horizontal
showsHorizontalScrollIndicator={false}
snapToInterval={pitWidth + GAP}
decelerationRate="fast"
bounces={false}
pagingEnabled={false}
onScroll={handleScroll}
onScrollBeginDrag={handleScrollBegin}
onScrollEndDrag={handleScrollEnd}
onMomentumScrollBegin={handleMomentumScrollBegin}
onMomentumScrollEnd={handleMomentumScrollEnd}
viewabilityConfig={{ viewAreaCoveragePercentThreshold: 50 }}
onViewableItemsChanged={handleViewableItemsChanged}
style={styles.
flatList}
contentContainerStyle={styles.
flatListContent}
removeClippedSubviews={false}
// 添加触摸事件处理
onTouchStart={handleTouchStart}
onTouchEnd={handleTouchEnd}
// 简化手势处理，避免冲突
onStartShouldSetResponder={() => false}
onMoveShouldSetResponder={() => false}
// 确保轮播优先响应手势
- 参考文章优化
scrollEventThrottle={16}
directionalLockEnabled={true}
alwaysBounceHorizontal={false}
alwaysBounceVertical={false}
nestedScrollEnabled={true}
// 新增：优化滚动体验
keyboardShouldPersistTaps="handled"
getItemLayout={(data, index) => ({
length: pitWidth + GAP,
offset: (pitWidth + GAP) * index,
index,
})}
/>
</View>
);
};
const styles = StyleSheet.create({
container: {
position: 'relative',
overflow: 'hidden',
paddingHorizontal: 0,
},
bgImage: {
position: 'absolute',
top: 0,
left: 0,
width: '100%',
height: '100%',
zIndex: 0,
},
flatList: {
zIndex: 1,
},
flatListContent: {
paddingVertical: 8, // 从12调整为8
paddingHorizontal: OUTER_PADDING,
flexDirection: 'row',
alignItems: 'center',
},
pitContainer: {
borderRadius: PIT_RADIUS,
overflow: Platform.OS === 'android' ? 'hidden' : 'visible',
backgroundColor: '#fff',
justifyContent: 'center',
alignItems: 'center',
},
pitImage: {
width: '100%',
height: '100%',
borderRadius: PIT_RADIUS,
},
});
export default HomeSmallPitBanner;
这个无缝轮播有问题，无论是手动滑动还是自动轮播最后
一张到第
一张的
时候会出现卡顿往返晃
一下的情况，解决
一下
解决iOS FlatList下拉刷新难题
本文分享了一次解决iOS端FlatList组件在数据不满一屏时无法下拉刷新的问题经历，深入探讨了alwaysBounceVertical属性的作用及设置方法，为开发者提供了宝贵的实战经验。
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