react-narive-picker+ sectionList高性能的分组列表组件+webview

(1) react-native-picker第三方组件

(1)安装

npm install react-native-picker --save

(2) link

react-native link react-native-picker

(3) 引入

import Picker from 'react-native-picker'

(4) 使用
(一) Picker.init选项
pickerData ：数据源
selectedValue ：默认选择第几项
pickerConfirmBtnText ：确定按钮
pickerCancelBtnText ：取消按钮
pickerTitleText ：pickerToolBar的标题
pickerToolBarBg ：顶部菜单背景（pickerToolBar背景）
pickerBg ：选项内容的背景
pickerToolBarFontSize ：顶部菜单文字大小
pickerFontSize ：选项内容文字大小
onPickerConfirm() ：点击确定按钮后执行的函数
onPickerCancel() ：取消后执行的回调函数
onPickerSelect() ： 选择后执行的回掉函数
示例代码：

_pickerShow(){
Picker.init({
pickerData: [
{
北京:[
{
朝阳区:['艾欧尼亚','暗影岛']
},
{
东城区:['艾欧尼亚2','暗影岛2']
}
]
},

{
重庆:[
{
渝北区:['光电园','嘉州']
},
{
江北区:['观音桥','华新街']
}
]
},

],
selectedValue: ['重庆','渝北区','嘉州'],
pickerConfirmBtnText:'确定',
pickerCancelBtnText:'取消',
pickerTitleText:'选择城市',
pickerToolBarBg: [232, 232, 232, 1],
pickerBg:[245,245,245,1],
pickerToolBarFontSize: 16,
pickerFontSize: 20,
onPickerConfirm: (data) => {
// console.log(data)
var pp = JSON.stringify(data)

AsyncStorage.setItem('cityContent',pp)

AsyncStorage.getItem('cityContent').then( (data) => {
var mm = JSON.parse(data)

this.setState({
cityContent: mm
})
})
}
});
Picker.show();
}

----------------------------------------------------

<TouchableNativeFeedback
onPress={ this._pickerShow.bind(this) }
>
<View style={ styles.cityContainer}>
<Text style={ styles.cityText}>选择城市：</Text>
<Text style={styles.cityText_showtext}>
{this.state.cityContent}
</Text>
</View>
</TouchableNativeFeedback>

(github地址)https://github.com/beefe/react-native-picker/blob/master/README.md
http://www.jianshu.com/p/90f8d1f3d638

效果图

效果图2

(2) sectionList分组列表组件 （这个组件踩了很多坑）

(1)常用属性：
sections ： 数据源，数据格式是数组Array
renderItem ：每一个section(分组)中的item(列表)
renderSectionHeader ：每个section(分组)中的header(头部)
keyExtractor ：为每一个item生成唯一的key，也可以在所有的对象数组中都加上key,就不会出现黄色的缺少key的警告
refreshing ：是否处于刷新状态（和flatList，listView一样）
onRefresh ：下拉刷新 （和flatList，listView一样）
onEndReached ：上拉加载（和flatList，listView一样）
onEndReachedThreshold ：到底部多大距离触发上拉加载（和flatList，listView一样）
ItemSeparatorComponent ：每个item的分割组件，不会出现在第一行之前和最后一行之后(注意是组件哦，第一个字母要大写)
SectionSeparatorComponent ：每个分组的分割组件。(注意是组件哦，第一个字母要大写)
ListHeaderComponent ：头部组件(注意是组件哦，第一个字母要大写)
ListFooterComponent ：尾部组件(注意是组件哦，第一个字母要大写)
(2)关于sectios数据源
注意，这里坑比较多
(1) sectons数组里面，必须是 key和data，不能换成其他的属性变量，比如：data不能换成value
(2) 数据的格式必须是：

const array =  [
{  key:'xxx',data:[ {title:'xxx',content:'xxx'} ,{title:'xxx',content:'xxx'}]  } ,
{  key:'xxx',data:[ {title:'xxx',content:'xxx'} ,{title:'xxx',content:'xxx'}]  } ,
....
]

(3) 使用例子

render() {
return (
<View style={styles.container}>
<SectionList
sections={ Data.data }
renderItem= { this._renderItem }
renderSectionHeader = { this._renderSectionHeader}
keyExtractor={(item,index)=>("index"+index+item)}
SectionSeparatorComponent={()=><View style={{height:20,backgroundColor:'blue'}}></View>}
ItemSeparatorComponent={ () => <View style={{height:3,backgroundColor:'#ffb02e'}}></View>}
/>
</View>
);
}
-----------------------------------------------------
_renderItem(item){
console.log(item)
return(
<View>
<Text style={{ color: 'blue' }}>{ item.item.title }</Text>
<Text style={{ color: 'green' }}>{ item.item.content }</Text>
</View>
)
}

_renderSectionHeader(header) {
return (
<Text  style={{ color: 'red' }}>
{ header.section.key}
</Text>
)
}
----------------------------------------
mock的JSON数据：引入是取名是Data，所以sections数据源用Data.data取到数组
{
"data":[
{
"key":"居家易肝病",
"data":[
{ "title": "53种病停止输注抗菌药 乱输液有七大危害",
"content":"http://jiankang.163.com/17/0801/14/CQOQGE2N0038804U.html",
"date":"2017-08-01 14:00",
"image":"http://imgsize.ph.126.net/?imgurl=http://cms-bucket.nosdn.127.net/32e39ba9aed74dfa845708493f897ba320170801140018.png_150x100x1x85.jpg"
},
{ "title": "生男生女神药”真的神？不靠谱别上当",
"content":"http://jiankang.163.com/17/0801/14/CQOQGE2N0038804U.html",
"date":"2017-07-31 12:10",
"image":"http://imgsize.ph.126.net/?imgurl=http://cms-bucket.nosdn.127.net/44f4e117250d49e8aa9f0150e7b503a820170731121632.png_150x100x1x85.jpg"
},
{ "title": "专家建议：预防药物性肝病莫乱服药",
"content":"http://jiankang.163.com/17/0801/14/CQOQGE2N0038804U.html",
"date":"2017-08-01 14:00",
"image":"http://imgsize.ph.126.net/?imgurl=http://cms-bucket.nosdn.127.net/a46d0f817efe42e8aa93b28fd747e58220170728100007.png_150x100x1x85.jpg"
},
{ "title": "北京人期望寿命82.03岁 高于全国平均水平",
"content":"http://jiankang.163.com/17/0801/14/CQOQGE2N0038804U.html",
"date":"2017-08-01 14:00",
"image":"http://imgsize.ph.126.net/?imgurl=http://cms-bucket.nosdn.127.net/32e39ba9aed74dfa845708493f897ba320170801140018.png_150x100x1x85.jpg"
}, { "title": "人社部解读36种药品进入医保药品目录",
"content":"http://jiankang.163.com/17/0801/14/CQOQGE2N0038804U.html",
"date":"2017-08-01 14:00",
"image":"http://imgsize.ph.126.net/?imgurl=http://cms-bucket.nosdn.127.net/32e39ba9aed74dfa845708493f897ba320170801140018.png_150x100x1x85.jpg"
}

]
},
{
"key":"居家易肺病",
"data":[
{ "title": "53种病停止输注抗菌药 乱输液有七大危害",
"content":"http://jiankang.163.com/17/0801/14/CQOQGE2N0038804U.html",
"date":"2017-08-01 14:00",
"image":"http://imgsize.ph.126.net/?imgurl=http://cms-bucket.nosdn.127.net/32e39ba9aed74dfa845708493f897ba320170801140018.png_150x100x1x85.jpg"
},
{ "title": "生男生女神药”真的神？不靠谱别上当",
"content":"http://jiankang.163.com/17/0801/14/CQOQGE2N0038804U.html",
"date":"2017-07-31 12:10",
"image":"http://imgsize.ph.126.net/?imgurl=http://cms-bucket.nosdn.127.net/44f4e117250d49e8aa9f0150e7b503a820170731121632.png_150x100x1x85.jpg"
},
{ "title": "专家建议：预防药物性肝病莫乱服药",
"content":"http://jiankang.163.com/17/0801/14/CQOQGE2N0038804U.html",
"date":"2017-08-01 14:00",
"image":"http://imgsize.ph.126.net/?imgurl=http://cms-bucket.nosdn.127.net/a46d0f817efe42e8aa93b28fd747e58220170728100007.png_150x100x1x85.jpg"
},
{ "title": "北京人期望寿命82.03岁 高于全国平均水平",
"content":"http://jiankang.163.com/17/0801/14/CQOQGE2N0038804U.html",
"date":"2017-08-01 14:00",
"image":"http://imgsize.ph.126.net/?imgurl=http://cms-bucket.nosdn.127.net/32e39ba9aed74dfa845708493f897ba320170801140018.png_150x100x1x85.jpg"
}, { "title": "人社部解读36种药品进入医保药品目录",
"content":"http://jiankang.163.com/17/0801/14/CQOQGE2N0038804U.html",
"date":"2017-08-01 14:00",
"image":"http://imgsize.ph.126.net/?imgurl=http://cms-bucket.nosdn.127.net/32e39ba9aed74dfa845708493f897ba320170801140018.png_150x100x1x85.jpg"
}

]
}

]
}

效果图：

效果图

http://blog.csdn.net/mengks1987/article/details/70236823
http://www.jianshu.com/p/6302c4d48b97

(清晰)https://segmentfault.com/a/1190000009736867

(详细)http://blog.csdn.net/qq_38453189/article/details/72810741

(scrollView,listView,flatList,sectionList的区别)http://www.jianshu.com/p/6302c4d48b97
http://www.jianshu.com/p/346474013915

(3)WebView

属性：
source ：需要加载网页的网址
automaticallyAdjustContentInsets ：是否自动调整内容，默认是true

<WebView
source={{uri: params.webview }}
automaticallyAdjustContentInsets={true}

/>

(常用属性)http://www.jianshu.com/p/bce419c39af3

(详细)http://blog.csdn.net/sinat_17775997/article/details/60872714

(踩坑)http://www.jianshu.com/p/f963839fca1a

效果图：

webview

(ReactNative实现图片上传功能 )http://blog.csdn.net/codetomylaw/article/details/52446786

(React-native使用FormDate上传图片异常总结)http://www.jianshu.com/p/b5c81d7dfbb9

(react-native图片循环上传七牛)http://www.jianshu.com/p/1b78787c56be

(七牛上传图片的了解与使用)http://www.jianshu.com/p/5d7b5324786d

作者：省局到

链接：http://www.jianshu.com/p/ea94c8c1ee44

來源：简书

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