React-native IOS:网络请求失败 [英] React-native IOS: Network request failed

问题描述

我正在测试本机应用程序(在 xcode 模拟器 v9.2/xcode 7.2.1 中的 OS X Yosemite 上).我收到以下代码的 Network request failed 错误.具有正确 appid 的实际 url 在浏览器中工作正常，并以 json 格式为我提供正确的信息，并且 promise/api 调用看起来不错.

I'm testing a react native app (on OS X Yosemite in the xcode simulator v9.2 / xcode 7.2.1). I'm getting a Network request failed error with the below code. The actual url with the correct appid works just fine in a browser and gives me the correct information in json format, and the promise / api call looks fine.

我不在防火墙后面.我已尝试对连接进行故障排除，并在开发人员设置中激活 Allow HTTP Services，但我仍然收到错误消息.

I'm not behind a firewall. I've tried troubleshooting the connection, and activating the Allow HTTP Services in the Developer settings, but I'm still getting the error.

知道这里有什么问题吗?实际错误如下:

Any idea what the problem is here? The actual errors are as follows:

-- There has been a problem with your fetch operation: Network request failed
-- Api call error =  Network request failed

这是 api.js 代码:

Here's the api.js code:

var _ = require('lodash');
var rootUrl = 'http://api.openweathermap.org/data/2.5/weather?APPID=xxxxxxxxxxxxxxxxxxxxxx';

var kelvinToF = function(kelvin) {
  return Math.round((kelvin - 273.15) * 1.8 + 32) + ' ˚F'
};

var kelvinToC = function(kelvin) {
  return Math.round(kelvin - 273.15) + ' ˚C'
};  

module.exports = function(latitude, longitude) {
  var url = `${rootUrl}&lat=${latitude}&lon=${longitude}`;
  console.log(url);
  return fetch(url)
    .then(function(response){
      return response.json();
    })
    .then(function(json){
      return {
        city: json.name,
        temperature1: kelvinToF(json.main.temp),
        temperature2: kelvinToC(json.main.temp),
        description: _.capitalize(json.weather[0].description)
      }
    })
    .catch(function(error) {
    console.log('There has been a problem with your fetch operation: ' + error.message);
    throw error;
});
}

这是 index.ios.js 代码.

Here's the index.ios.js code.

/*  --depreciated

var React = require('react-native'); 

var {
  AppRegistry,
  MapView,
  View,
  Text,
  StyleSheet
} = React;
*/ 


// updated
import React from 'react';

// updated
import {
  AppRegistry,
  MapView,
  View,
  Text,
  StyleSheet,
} from 'react-native';

var Api = require('./src/api');

var Weather = React.createClass({
  getInitialState: function() {
    return {
      pin: {
        latitude: 0,
        longitude: 0
      },
      city: '',
      temperature1: '',
      temperature2: '',
      description: ''
    };
  },
  render: function() {
    return <View style={styles.container}>
      <MapView
        annotations={[this.state.pin]}
        onRegionChangeComplete={this.onRegionChangeComplete}
        style={styles.map}>
      </MapView>
      <View style={styles.textWrapper}>
        <Text style={styles.text}>{this.state.city}</Text>
        <Text style={styles.text}>{this.state.temperature1}</Text>
        <Text style={styles.text}>{this.state.temperature2}</Text>
        <Text style={styles.text}>{this.state.description}</Text>
      </View>
    </View>
  },
  onRegionChangeComplete: function(region) {
    this.setState({
      pin: {
        longitude: region.longitude,
        latitude: region.latitude
      }
    });

    Api(region.latitude, region.longitude)
      .then((data) => {
        console.log(region.latitude);
        console.log(region.longitude);
        console.log('data = ' + data);
        this.setState(data);
      })
      .catch((error)=>{
     console.log("Api call error = ", error.message);
    // alert(error.message);     
  });
  }
});


var styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'stretch',
    backgroundColor: '#F5FCFF'
  },
  map: {
    flex: 2,
    marginTop: 30
  },
  textWrapper: {
    flex: 1,
    alignItems: 'center'
  },
  text: {
    fontSize: 30
  }
});

AppRegistry.registerComponent('weather', () => Weather);

推荐答案

您需要更改 info.plist 中的 NSAppTransportSecurity 策略.默认情况下，ios 8 和更大的纯文本请求被阻止.请参阅传输安全已阻止明文 HTTP

You will need to change your NSAppTransportSecurity policy in info.plist. By default in ios 8 and greater plaintext request are blocked. See Transport security has blocked a cleartext HTTP

这篇关于React-native IOS:网络请求失败的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！