React-native IOS:网络请求失败

Question

我正在测试一个react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Network request failed以下代码的错误.具有正确appid的实际url在浏览器中运行良好,并以json格式提供正确的信息,并且promise/api调用看起来很好.

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

知道这里的问题是什么吗？实际错误如下:

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

这是api.js代码:

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.

/*  --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);

Answer 1

好的,谢谢@while1上面的回答,我发现答案对我有用.我上面的问题中的代码很好.我不得不更改info.plist文件.哇苹果的痛苦是什么,为什么它们会如此复杂？

我基本上将以下内容添加到info.plist文件中.

<key>NSAllowsArbitraryLoads</key>
<true/> 

像这样:

<key>NSAppTransportSecurity</key>
    <dict>
        <key>NSAllowsArbitraryLoads</key>
        <true/>
        <key>NSExceptionDomains</key>
        <dict>
            <key>localhost</key>
            <dict>
                <key>NSTemporaryExceptionAllowsInsecureHTTPLoads</key>
                <true/>
            </dict>
        </dict>
    </dict>

有关详细信息,请参阅@ while1上面的答案中的链接.

Answer 2

您需要在info.plist中更改NSAppTransportSecurity策略.默认情况下,ios 8和更高版本的明文请求被阻止.请参阅传输安全性已阻止明文HTTP