React-native Android Navigator -scene 空白答案

【问题标题】：React-native Android Navigator -scene blankReact-native Android Navigator -scene 空白
【发布时间】：2016-01-26 09:05:20
【问题描述】：

我尝试做一个导航器的例子，但场景总是空白。一些建议告诉我将 flex:1 设置为导航器，但它不起作用！这是我的代码： index.android.js：

'use strict';
import React, {
  AppRegistry,
  Component,
  StyleSheet,
  Navigator,
  Text,
  View
} from 'react-native';
import Homepage from './Homepage' ;
class NavigatorTest extends Component {
  render() {
    var defaultName = 'Homepage' ;
    var defaultCom = Homepage ;
    return (
      <Navigator style = {{flex:1}}
        initialRoute = {{name: defaultName,component:Homepage }}
        configureScene = {() => {
          return Navigator.SceneConfigs.VerticalDownSwipeJump ;
        }}
        renderScene = {(route,navigator) => {
          let Component = route.component ;
          if (route.component) {
            return <Component {...route.params} navigator = {navigator} />
          }
        }} />
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#F5FCFF',
  },
});

AppRegistry.registerComponent('NavigatorTest', () => NavigatorTest);

主页.js

import React, {
  Component,
  StyleSheet,
  TouchableOpacity,
  Text,
  View
} from 'react';
import Detailpage from './Detailpage' ;
export  class Homepage extends React.Component {
  static propTypes = {
  };

  constructor(props) {
    super(props);
  }
  _pressButton() {
    const {navigator} = this.props ;
    if(navigator) {
        navigator.push({
            name: 'Detailpage',
            component:Detailpage,
        })
    }
  }

  render() {
    return (
      <View>
        <TouchableOpacity onPress = {this._pressButton}>
            <Text>click to jump to Detailpage!</Text>
        </TouchableOpacity>
      </View>
    );
  }
}

Detailpage.js

import React, {
  Component,
  StyleSheet,
  TouchableOpacity,
  Text,
  View
} from 'react';
import Homepage from './Homepage' ;
export class Detailpage extends React.Component {
  static propTypes = {
  };
  constructor(props) {
    super(props);
  }
  _pressButton() {
    const {navigator} = this.props ;
    if (navigator) {
        navigator.pop() ;
    }
  }
  render() {
    return (
      <View>
        <TouchableOpacity onPress = {this._pressButton}>
            <Text>click to get back</Text>
        </TouchableOpacity>
      </View>
    );
  }
}

我是react-native新手，请多多指教，先谢谢了！

【问题讨论】：

标签： android react-native navigator

【解决方案1】：

尝试稍微简化和分离您的导航器逻辑。这样调试也会更容易。

class NavigatorTest extends Component {

  render() {
    return (
      <Navigator
        initialRoute={{id: 'Homepage'}}
        configureScene={this.configureScene}
        renderScene={this.renderScene}
      />
    );
  }

  configureScene() {
    return Navigator.SceneConfigs.VerticalDownSwipeJump;
  }

  renderScene(route, navigator) {
    switch(route.id) {
      case 'Homepage':
        return this.renderHomepage(navigator);
      case 'Detailpage':
        return this.renderDetailpage(navigator);
      default:
        throw new Error('No route found for id ' + route.id);
    }
  }

  renderHomepage(navigator) {
    return <Homepage navigator={navigator} />;
  }

  renderDetailpage(navigator) {
    return <Detailpage navigator={navigator} />;
  }

}

Homepage.js

...

_pressButton() {
  this.props.navigator.push({id: 'Detailpage'});
}

...

【讨论】：

感谢您的回答，但我得到“未定义不是函数（正在评估'this.renderHomepage（navigator）'）”，如何找到该函数？

【解决方案2】：

Villeaka 提出的分离 Navigator 逻辑更便于阅读和分析。

方法“this.renderHomepage(navigator)”在“renderScene”范围内被调用，所以其中的“this”指的是“renderScene”而不是NavigatorTest组件，将“this”传递给一个新的变量，如下所示：

renderScene(route, navigator) {
var me = this;
switch(route.id) {
  case 'Homepage':
    return me.renderHomepage(navigator);
  case 'Detailpage':
    return me.renderDetailpage(navigator);
  default:
    throw new Error('No route found for id ' + route.id);
}}

【讨论】：

【解决方案3】：

我觉得你的导航看起来有点乱，我发现这个视频让它变得如此简单

https://www.youtube.com/watch?v=jGOst2TLha0

顺便说一下，我对你的代码的快速理解是

<Navigator style = {{flex:1}}
    initialRoute = {{name: defaultName,component:Homepage }}
    configureScene = {() => {
      return Navigator.SceneConfigs.VerticalDownSwipeJump ;
    }}
    renderScene = {(route,navigator) => {
      let Component = route.component ;
      if (route.component) {
        return <Component {...route.params} navigator = {navigator} />
      }
}} />

“让组件”看起来不正确，因为变量名称不应与代码顶部导入的“组件”库相同，导致模棱两可

【讨论】：