React Native 如何做轮播图 react-native-swiper

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//:仿饿了么github:https://github.com/stoneWeb/elm-react-native

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最近项目需求需要用到轮播图，所以写两Demo练练手，不过效果不太理想，希望大牛予以指正。

不多说，先上图。

这种轮播很常见，但是一个问题是，总感觉有点卡的感觉，最气人的是，你滑动到哪里，他就听到哪里，给用户感觉很不爽！

下面我分享一下该轮播的代码！

//import liraries
import React, { Component } from 'react';
import { View, Text, StyleSheet, TouchableOpacity, Dimensions, Image, ScrollView } from 'react-native';
import Swiper from 'react-native-swiper';

let { width, height } = Dimensions.get('window');
let Images = [
    { src: require('../assets/images/1.jpg') },
    { src: require('../assets/images/2.jpg') },
    { src: require('../assets/images/3.jpg') },
    { src: require('../assets/images/4.jpg') }
];
const loading = require('../assets/images/loading.gif');

// create a component
class TargetView extends Component {
    static navigationOptions = {
        title: '目标',
        headerStyle: {
            backgroundColor: '#FF3344',
        },
    }

    _renderSwiper() {
        return (
            <Swiper
                style={styles.swiperStyle}
                height={}
                horizontal={true}
                autolay={true}
                loop={true}
                paginationStyle={{ bottom:  }}
                showsPagination={true}
                index={}
                dotStyle={{ backgroundColor: 'rgba(0,0,0,.2)', width: , height:  }}
                activeDotStyle={{ backgroundColor: 'rgba(0,0,0,.5)', width: , height:  }}>
                <View style={styles.swiperItem}>
                    <Image style={styles.imageStyle} source={Images[].src}></Image>
                </View>
                <View style={styles.swiperItem}>
                    <Image style={styles.imageStyle} source={Images[].src}></Image>
                </View>
                <View style={styles.swiperItem}>
                    <Image style={styles.imageStyle} source={Images[].src}></Image>
                </View>
                <View style={styles.swiperItem}>
                    <Image style={styles.imageStyle} source={Images[].src}></Image>
                </View>
            </Swiper>
        )
    }

    render() {
        return (
            <ScrollView
                style={styles.container}>
                {this._renderSwiper()}
            </ScrollView>
        );
    }
}

// define your styles
const styles = StyleSheet.create({
    container: {
        flex:
    },
    swiperStyle: {
        marginTop:,
        width: width,
    },
    swiperItem: {
        flex: ,
        justifyContent: 'center',
        backgroundColor: 'transparent',
    },
    imageStyle: {
        flex: ,
        width:width,
    },
});

//make this component available to the app
export default TargetView;

第二个情况，先上一张图

都看到这是仿饿了么的轮播效果，但情况依然很不爽，大牛给出点优化建议啊！

下面我分享一下该轮播的效果，（如果你正在做轮播，做的比较好，谢谢分享我一下，本人虚心学习，微信：jkxx123321）

//import liraries
import React, { Component } from 'react';
import {
    View,
    Text,
    StyleSheet,
    Dimensions,
    Image,
    TouchableOpacity,
    TouchableNativeFeedback,
    TouchableWithoutFeedback,
    ScrollView,
    Platform,
    Animated,
} from 'react-native';
import Swiper from 'react-native-swiper';
import px2pd from '../utils/px2dp';

let { width, height } = Dimensions.get('window');
const isIOS = Platform.OS == 'ios';
const headH = px2pd(isIOS ?  : );
const inputHeight = px2pd();

const imgTypes = [
    { src: require('../assets/images/1.jpg') },
    { src: require('../assets/images/2.jpg') },
    { src: require('../assets/images/3.jpg') },
    { src: require('../assets/images/4.jpg') },
    { src: require('../assets/images/4.jpg') },
    { src: require('../assets/images/1.jpg') },
    { src: require('../assets/images/2.jpg') },
    { src: require('../assets/images/3.jpg') },
    { src: require('../assets/images/4.jpg') },
    { src: require('../assets/images/4.jpg') },
    { src: require('../assets/images/1.jpg') },
    { src: require('../assets/images/2.jpg') },
    { src: require('../assets/images/3.jpg') },
    { src: require('../assets/images/4.jpg') },
    { src: require('../assets/images/4.jpg') },
    { src: require('../assets/images/4.jpg') },
    { src: require('../assets/images/4.jpg') }
];
const loading = require('../assets/images/loading.gif');

// create a component
class TargetView extends Component {
    static navigationOptions = {
        title: '目标',
        headerStyle: {
            backgroundColor: '#FF3344',
        },
    }
    constructor(props) {
        super(props)
        this.state = {
            location: "联锦大厦",
        }
    }

    _renderHeader() {
        return (
            <View style={styles.header}>
                {/*定位、天气*/}
                <View style={styles.lbsWeather}>
                    <TouchableWithoutFeedback>
                        <View style={styles.lbs}>
                            <Image source={require('../assets/icons/search.png')} style={{ width: px2pd(), height: px2pd() }}></Image>
                            <Text style={{ fontSize: px2pd(), fontWeight: 'bold', color: '#fff', paddingHorizontal: px2pd() }}>{this.state.location}</Text>
                            <Image source={require('../assets/icons/search.png')} style={{ width: px2pd(), height: px2pd() }}></Image>
                        </View>
                    </TouchableWithoutFeedback>
                    <View style={styles.weather}>
                        <View style={{ marginRight: px2pd() }}>
                            <Text style={{ fontSize: px2pd(), color: '#fff', textAlign: 'center' }}>{'20℃'}</Text>
                            <Text style={{ fontSize: px2pd(), color: '#fff' }}>{'晴天'}</Text>
                        </View>
                        <Image source={require('../assets/icons/search.png')} style={{ width: px2pd(), height: px2pd() }}></Image>
                    </View>
                </View>
                {/*搜索框*/}
                <View style={{
                    marginTop: px2pd(),
                }}>
                    <TouchableWithoutFeedback onPress={() => { }}>
                        <View style={styles.searchBtn}>
                            <Image source={require('../assets/icons/search.png')} style={{ width: px2pd(), height: px2pd() }}></Image>
                            <Text style={{ fontSize: px2pd(), color: '#666', marginLeft: px2pd() }}>{'输入商家，商品名称'}</Text>
                        </View>
                    </TouchableWithoutFeedback>
                </View>
                <Animated.View style={styles.keywords}>
                    {
                        ['肯德基', '烤肉', '吉野家', '粥', '必胜客', '一品生煎', '星巴克'].map((item, i) => {
                            return (
                                <TouchableWithoutFeedback key={i}>
                                    <View style={{ marginRight: px2pd() }}>
                                        <Text style={{ fontSize: px2pd(), color: '#fff' }}>{item}</Text>
                                    </View>
                                </TouchableWithoutFeedback>
                            )
                        })
                    }
                </Animated.View>
            </View>
        )
    }

    _renderTypes() {
        const w = width / , h = w * . + ;
        let renderSwipeView = (types, n) => {
            return (
                <View style={styles.typesView}>
                    {
                        types.map((item, i) => {
                            let render = (
                                <View style={[{ width: w, height: h }, styles.typesItem]}>
                                    <Image source={imgTypes[n + i].src} style={{ width: w * ., height: w * . }} />
                                    <Text style={{ fontSize: px2pd(), color: "#666" }}>{item}</Text>
                                </View>
                            )
                            return (
                                isIOS ? (
                                    <TouchableHighlight style={{ width: w, height: h }} key={i} onPress={() => { }}>{render}</TouchableHighlight>
                                ) : (
                                        <TouchableNativeFeedback style={{ width: w, height: h }} key={i} onPress={() => { }}>{render}</TouchableNativeFeedback>
                                    )
                            )
                        })
                    }
                </View>
            )
        }
        return (
            <Swiper
                height={h * 2.4}
                paginationStyle={{ bottom:  }}
                dotStyle={{ backgroundColor: 'rgba(0,0,0,.2)', width: , height:  }}
                activeDotStyle={{ backgroundColor: 'rgba(0,0,0,.5)', width: , height:  }}>
                {renderSwipeView(['美食', '甜品饮品', '商店超市', '预定早餐', '果蔬生鲜', '新店特惠', '准时达', '高铁订餐'], )}
                {renderSwipeView(['土豪推荐', '鲜花蛋糕', '汉堡炸鸡', '日韩料理', '麻辣烫', '披萨意面', '川湘菜', '包子粥店'], )}
            </Swiper>
        )
    }

    render() {
        return (
            <View style={styles.container}>
                <ScrollView style={styles.scrollView}>
                    {this._renderHeader()}
                    <View style={{ backgroundColor: "#fff", paddingBottom: px2pd() }}>
                        {this._renderTypes()}
                    </View>
                </ScrollView>
            </View>
        );
    }
}

// define your styles
const styles = StyleSheet.create({
    container: {
        flex: ,
        backgroundColor: '#f3f3f3',
    },
    scrollView: {
        marginBottom: px2pd(),
    },
    header: {
        backgroundColor: '#0398ff',
        height: headH,
        paddingTop: px2pd(isIOS ?  : ),
        paddingHorizontal: ,
    },
    lbsWeather: {
        height: inputHeight,
        overflow: "hidden",
        flexDirection: 'row',
        justifyContent: 'space-between',
    },
    lbs: {
        flexDirection: 'row',
        justifyContent: 'center',
        alignItems: 'center',
    },
    weather: {
        flexDirection: 'row',
        alignItems: 'center',
    },
    searchBtn: {
        borderRadius: inputHeight,
        height: inputHeight,
        flexDirection: 'row',
        backgroundColor: '#fff',
        justifyContent: 'center',
        alignItems: 'center',
    },
    keywords: {
        marginTop: px2pd(),
        flexDirection: 'row',
        justifyContent: 'space-between',
    },
    typesView: {
        paddingBottom: px2pd(),
        flex: ,
        backgroundColor: "#fff",
        flexDirection: "row",
        flexWrap: "wrap"
    },
    typesItem: {
        backgroundColor: '#fff',
        justifyContent: 'center',
        alignItems: 'center'
    },
});

//make this component available to the app
export default TargetView;
//---------------------px2dp.js------------------------------//

import { Dimensions } from 'react-native'

const deviceH = Dimensions.get('window').height
const deviceW = Dimensions.get('window').width

const basePx = 

export default function px2dp(px) {
    return px * deviceW / basePx
}

附一张属性表：

3.1 基本属性

Prop	Default	Type	Description
horizontal	true	bool	如果值为true时，那么滚动的内容将是横向排列的，而不是垂直于列中的。
loop	true	bool	如果设置为false，那么滑动到最后一张时，再次滑动将不会展示第一张图片。
index	0	number	初始进入的页面标识为0的页面。
showsButtons	false	bool	如果设置为true，那么就可以使控制按钮（即：左右两侧的箭头）可见。
autoplay	false	bool	设置为true，则页面可以自动跳转。

3.2 自定义属性

Prop	Default	Type	Description
width	-	number	如果你没有特殊的设置，就通过flex:1默认为全屏。
height	-	number	如果你没有特殊的设置，就通过flex:1默认为全屏。
style	{...}	style	设置页面的样式。

3.3 pagination 分页

Prop	Default	Type	Description
showsPagination	true	bool	默认值为true，在页面下边显示圆点，以标明当前页面位于第几个。
paginationStyle	{...}	style	设置页面原点的样式，自定义的样式会和默认样式进行合并。
renderPagination
dot	<View style={{backgroundColor:'rgba(0,0,0,.2)', width: 8, height: 8,borderRadius: 4, marginLeft: 3, marginRight: 3, marginTop: 3, marginBottom: 3,}} />	element	可以自定义不是当前圆点的样式
activeDot	<View style={{backgroundColor: '#007aff', width: 8, height: 8, borderRadius: 4, marginLeft: 3, marginRight: 3, marginTop: 3, marginBottom: 3,}} />	element	可以自定义当前页面圆点的样式

3.4 自动播放

Prop	Default	Type	Description
autoplay	true	bool	设置为true可以使页面自动滑动。
autoplayTimeout	2.5	number	设置每个页面自动滑动停留的时间
autoplayDirection	true	bool	圆点的方向允许默认自己控制

3.5 控制按钮

Prop		Default	Type	Description
showsButtons		true	bool	是否显示控制箭头按钮
buttonWrapperStyle		{position: 'absolute', paddingHorizontal: 15, paddingVertical: 30, top: 70, left: 0, alignItems:'flex-start'}	style	定义默认箭头按钮的样式
nextButton		<Text style={{fontSize:60, color:'#00a7ec',  paddingTop:30, paddingBottom:30}}>‹</Text>	element	自定义右箭头按钮样式
prevButton		<Text style={{fontSize:60, color:'#00a7ec', paddingTop:30, paddingBottom:30}}>›</Text>	element	自定义左箭头按钮样式

加油！