ios – React-native无法访问Parse数据

我正在尝试使用Parse作为Reactive Native应用程序中ListView的数据提供程序.我已经按照Parse指南关于订阅查询,但由于某些未知原因,数据源为空.我已经验证并编写了一个测试对象,Parse工作得很好.

似乎应该在getinitialState()之前调用observe()或者我错过了什么？

'use strict';
var React = require('react-native');
var Strings = require('./LocalizedStrings');
var Parse = require('parse').Parse;
var ParseReact = require('parse-react');

Parse.initialize("api_key_here","api_key_here");

/*
var TestObject = Parse.Object.extend("TestObject");
var testObject = new TestObject();
testObject.save({foo: "bar"}).then(function(object) {
  alert("yay! it worked");
});
*/

var {
  View,Text,ListView,StyleSheet
} = React;

var styles = StyleSheet.create({
  mainContainer: {
    flex: 1,padding: 30,marginTop: 65,flexDirection: 'column',justifyContent: 'center',backgroundColor: '#fff'
  },title: {
    marginBottom: 20,fontSize: 22,textAlign: 'center',color: '#000'
  },});

var ds = new ListView.DataSource({rowHasChanged: (r1,r2) => r1 !== r2}) // assumes immutable objects

var WorkoutList = React.createClass({
  mixins: [ParseReact.Mixin],observe: function() {
    return {
      workouts: (new Parse.Query("Workout")).descending("createdAt")
    };
  },getinitialState: function() {
    return {dataSource: ds.cloneWithRows(this.data.workouts)}
  },renderRow: function() {
    return (<View><Text>Testing</Text></View>)
  },render: function() {
    return (
      <View style = {{flex: 1,flexDirection: 'column'}}>
          {Strings.workoutsTabTitle}
          <ListView
            ref = "listview"
            dataSource = {this.state.dataSource}
            renderRow = {this.renderRow}
            automaticallyAdjustContentInsets = {false}
            keyboarddismissMode = "onDrag"
            keyboardShouldPersistTaps = {true}
            showsverticalScrollIndicator = {true}
            style = {styles.mainContainer}
          />
      </View>
    )
  }
})

module.exports = WorkoutList;

解决方法

我没有使用ParseReact,而是使用Parse Rest API从Parse获取数据.从componentDidMount调用以下代码.

fetch("https://api.parse.com/1/classes/Workout",{
  headers: {
    "X-Parse-Application-Id": "Your application Id","X-Parse-REST-API-Key": "Your API Key"
  }
})
  .then((response) => response.json())
  .then((responseData) => {
    this.setState({
      dataSource: this.state.dataSource.cloneWithRows(responseData.results),loaded: true,})
  })
  .catch(function(error) {
    console.log(error)
  })
 .done();

使用此方法,您需要等到数据加载后再显示ListView.使用this.state.loaded来了解何时是这种情况.