网络请求，使用的是第三方网络接口- 和风天气（有免费，也有商用的接口），大家可以去注册，登录一下，创建一个项目，会得到一个key，然后就可以免费使用了
和风天气-对应的文档：
https://dev.qweather.com/docs/api/weather/weather-daily-forecast/
测试一下接口--请求三天的天气预报
可以直接用浏览器来测试（写可以用postman软件来测试），
https://devapi.qweather.com/v7/weather/3d?location=116.41,39.92&key=ab016705d280420b8d72f5c6892901dc
结果如下：
image.png
转化为json格式
{
"code": "200",
"updateTime": "2021-11-15T16:35+08:00",
"fxLink": "http://hfx.link/2ax1",
"daily": [
{
"fxDate": "2021-11-15",
"sunrise": "06:58",
"sunset": "16:59",
"moonrise": "15:16",
"moonset": "03:40",
"moonPhase": "盈凸月",
"moonPhaseIcon": "803",
"tempMax": "12",
"tempMin": "-1",
"iconDay": "101",
"textDay": "多云",
"iconNight": "150",
"textNight": "晴",
"wind360Day": "45",
"windDirDay": "东北风",
"windScaleDay": "1-2",
"windSpeedDay": "3",
"wind360Night": "0",
"windDirNight": "北风",
"windScaleNight": "1-2",
"windSpeedNight": "3",
"humidity": "65",
"precip": "0.0",
"pressure": "1020",
"vis": "25",
"cloud": "4",
"uvIndex": "3"
},
{
"fxDate": "2021-11-16",
"sunrise": "07:00",
"sunset": "16:58",
"moonrise": "15:38",
"moonset": "04:40",
"moonPhase": "盈凸月",
"moonPhaseIcon": "803",
"tempMax": "13",
"tempMin": "0",
"iconDay": "100",
"textDay": "晴",
"iconNight": "101",
"textNight": "多云",
"wind360Day": "225",
"windDirDay": "西南风",
"windScaleDay": "1-2",
"windSpeedDay": "3",
"wind360Night": "225",
"windDirNight": "西南风",
"windScaleNight": "1-2",
"windSpeedNight": "3",
"humidity": "74",
"precip": "0.0",
"pressure": "1016",
"vis": "25",
"cloud": "1",
"uvIndex": "3"
},
{
"fxDate": "2021-11-17",
"sunrise": "07:01",
"sunset": "16:57",
"moonrise": "16:01",
"moonset": "05:41",
"moonPhase": "盈凸月",
"moonPhaseIcon": "803",
"tempMax": "13",
"tempMin": "0",
"iconDay": "100",
"textDay": "晴",
"iconNight": "150",
"textNight": "晴",
"wind360Day": "225",
"windDirDay": "西南风",
"windScaleDay": "1-2",
"windSpeedDay": "3",
"wind360Night": "225",
"windDirNight": "西南风",
"windScaleNight": "1-2",
"windSpeedNight": "3",
"humidity": "56",
"precip": "0.0",
"pressure": "1009",
"vis": "25",
"cloud": "0",
"uvIndex": "3"
}
],
"refer": {
"sources": [
"QWeather",
"NMC",
"ECMWF"
],
"license": [
"QWeather Developers License"
]
}
}
测试结果与文档一致，代表接口正常，下面我们就在代码进行请求
代码中请求接口
直接在代码中，用fetch请求
const byFetch = () => {
let appKey = "ab016705d280420b8d72f5c6892901dc"
let cityLocation = "116.41,39.92"
let url = `https://devapi.qweather.com/v7/weather/3d?location=${cityLocation}&key=${appKey}`
fetch(url, {
method: 'GET'
})
.then((response) => response.json())//response.json()返回是一个Promiss对象，才是我们需要的数据
.then((data) => {
console.log(data)
Alert.alert('success', '请求成功')
}).catch((error) => {
Alert.alert('error', JSON.stringify(error))
})
}
需要注意的地方是fetch(url, { method: 'GET' })返回的response，并不是我们想要的，而是要将其转化为json，//response.json()返回是一个Promiss对象，才是我们需要的数据,所以后面可以接着.then()
结果如下
image.png
封装api，用fetch请求
- 新建一个api.js文件
- 封装一个方法，并导出
getWeatherData
api.js文件代码
// 定义一个常量，存储appKey
const appKey = "ab016705d280420b8d72f5c6892901dc"
// 定义一个箭头函数，接收城市经纬度作为参数
export const getWeatherData = async (cityLocation) => {
// 根据城市经纬度获取天气数据
let url = `https://devapi.qweather.com/v7/weather/3d?location=${cityLocation}&key=${appKey}`
try {
// 使用await等待响应
let response = await fetch(url, {
method: 'GET'
})
// 使用await等待数据
let data = await response.json()
// 返回天气数据
return data
} catch (error) {
// 处理错误
console.error(error)
}
}
- 使用封装好的api来请求
getWeatherData
let cityLocation = "116.41,39.92"
getWeatherData(cityLocation)
.then((result) => {
console.log(result)
console.log(result.daily)
Alert.alert('ByFetch 成功', '请求成功')
}).catch((error) => {
Alert.alert('error', JSON.stringify(error))
})
image.png
这样我们就成功请求，并成功收到回复，收到数据
封装api，用axios请求
- 安装axios插件,
npm install axios或yarn add axios命令来安装Axios?？?/li> - ios中，需要去
pod install，下载到本地 - 在项目代码中，引入Axios模块
import axios from 'axios' - 封装一个方法，并导出
getWeatherDataByAxios
export const getWeatherDataByAxios = async (cityLocation) => {
console.log("getWeatherDataByAxios------")
// 根据城市经纬度获取天气数据
let url = `https://devapi.qweather.com/v7/weather/3d?location=${cityLocation}&key=${appKey}`
try {
// 使用axios发送请求，并使用await等待数据
let result = await axios.get(url)
// 返回天气数据
return result.data
} catch (error) {
// 处理错误
console.error(error)
}
}
需要注意的地方是，我们需要的数据在返回的result中的data中，所以看到代码中是这样返回的result.data
- 使用封装好的api来请求
getWeatherDataByAxios
let cityLocation = "116.41,39.92"
getWeatherDataByAxios(cityLocation)
.then((result) => {
console.log(result)
console.log(result.daily)
Alert.alert('getWeatherDataByAxios 成功', '请求成功')
}).catch((error) => {
Alert.alert('error', JSON.stringify(error))
})
image.png
这样我们就成功请求，并成功收到回复，收到数据
api.js文件里面的完整代码如下
import axios from 'axios';
// 定义一个常量，存储appKey
const appKey = "ab016705d280420b8d72f5c6892901dc"
// 定义一个箭头函数，接收城市经纬度作为参数
export const getWeatherData = async (cityLocation) => {
// 根据城市经纬度获取天气数据
let url = `https://devapi.qweather.com/v7/weather/3d?location=${cityLocation}&key=${appKey}`
try {
// 使用await等待响应
let response = await fetch(url, {
method: 'GET'
})
// 使用await等待数据
let data = await response.json()
// 返回天气数据
return data
} catch (error) {
// 处理错误
console.error(error)
}
}
// 定义一个箭头函数，接收城市经纬度作为参数
export const getWeatherDataByAxios = async (cityLocation) => {
console.log("getWeatherDataByAxios------")
// 根据城市经纬度获取天气数据
let url = `https://devapi.qweather.com/v7/weather/3d?location=${cityLocation}&key=${appKey}`
try {
// 使用axios发送请求，并使用await等待数据
let result = await axios.get(url)
// 返回天气数据
return result.data
} catch (error) {
// 处理错误
console.error(error)
}
}
测试文件home_screen.js里面的完整代码如下
//import liraries
import React, { Component } from 'react';
import { View, Text, StyleSheet, Button, Alert, axios } from 'react-native';
import MyLoading from './custom_component/loading'
import { getWeatherData, getWeatherDataByAxios } from './custom_component/api'
// create a component
const HomeScreen = ({ navigation }) => {
goToDetailScreen = () => {
navigation.navigate('Detail')
}
const byFetch = () => {
let cityLocation = "116.41,39.92"
getWeatherData(cityLocation)
.then((result) => {
console.log(result)
console.log(result.daily)
Alert.alert('ByFetch 成功', '请求成功')
}).catch((error) => {
Alert.alert('error', JSON.stringify(error))
})
// let appKey = "ab016705d280420b8d72f5c6892901dc"
// let cityLocation = "116.41,39.92"
// let url = `https://devapi.qweather.com/v7/weather/3d?location=${cityLocation}&key=${appKey}`
// fetch(url, {
// method: 'GET'
// })
// .then((response) => response.json())//response.json()返回是一个Promiss对象，才是我们需要的数据
// .then((data) => {
// console.log(data)
// Alert.alert('success', '请求成功')
// }).catch((error) => {
// Alert.alert('error', JSON.stringify(error))
// })
}
const byAxios = () => {
let cityLocation = "116.41,39.92"
getWeatherDataByAxios(cityLocation)
.then((result) => {
console.log(result)
console.log(result.daily)
Alert.alert('getWeatherDataByAxios 成功', '请求成功')
}).catch((error) => {
Alert.alert('error', JSON.stringify(error))
})
}
return (
<View style={styles.container}>
<Text>HomeScreen</Text>
<Button title='to detail screen' onPress={goToDetailScreen}></Button>
<MyLoading title="请稍后。。。" onTap={() => {
console.log("loading... tapped")
}}></MyLoading>
<Button title='to get weather data by axios' onPress={byAxios}></Button>
<Button title='to get weather data by fetch' onPress={byFetch}></Button>
</View>
);
};
// define your styles
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#f5f5f5',
},
});
//make this component available to the app
export default HomeScreen;
结尾
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