Stack Navigator就是普通导航，可定义页面App最上方的导航条属性。
官方文档在此： https://reactnavigation.org/docs/navigators/stack

我们在views文件夹下新建一个 LoginView，里面放一个登录表单，然后在主页通过点击左上角的登录图标来切换到这个LoginView，然后通过LoginView左上方的返回按钮回到主页面。

通常在 tab 里面定义相应的 stack navigator，比如下面这段代码的意思就是，
ButtonsTab这里面有两个View：

1. 签名为 Buttons ，显示内容来自ButtonsTabView，Path默认的 /
2. 签名为 Button_Detail，显示内容来自 ButtonsDetailTabView，Path默认为buttons_detail

const ButtonsTab = StackNavigator({
  Buttons: {
    screen: ButtonsTabView,
    path: '/',
    navigationOptions: ({ navigation }) => ({
      title: 'Buttons',
      headerLeft: (
        <Icon
          name="menu"
          size={30}
          type="entypo"
          style={{ paddingLeft: 10 }}
          onPress={() => navigation.navigate('DrawerOpen')}
        />
      ),
    }),
  },
  Button_Detail: {
    screen: ButtonsDetailTabView,
    path: '/buttons_detail',
    navigationOptions: {
      title: 'Buttons Detail',
    },
  },
});

而 ButtonsTabView 和 ButtonsDetailTabView 是封装了基本的 view

const ButtonsTabView = ({ navigation }) => (
  <ButtonsHome navigation={navigation} />
);

const ButtonsDetailTabView = ({ navigation }) => (
  <ButtonsDetails
    banner={`${navigation.state.params.name}s Profile`}
    navigation={navigation}
  />
);

实际上这里的 navigation 是传递到 ButtonsHome 和 ButtonsDetails 的 props。

我们来看看修改过后的 Home 和 Login

import React from 'react';
import { StyleSheet, Text, View, ScrollView } from 'react-native';
import { Card, PricingCard, ListItem, Button, Tile, Icon } from 'react-native-elements';
import { StackNavigator } from 'react-navigation';
import { LoginView } from '../views/LoginView'

class Home extends React.Component {

  static navigationOptions = {
    title: '敷点面膜',
    headerLeft: (
      <Icon
        name="calendar"
        size={30}
        type="evilicon"
        style={{ paddingLeft: 10 }}
      />
    ),
    headerRight: (
      <Icon
        name="search"
        size={30}
        type="evilicon"
        style={{ paddingRight: 10 }}
      />
    )
  }

  render() {
    return (
      <ScrollView>

        <Tile
           imageSrc={require('../images/card.jpg')}
           title="敷点面膜"
           featured
           caption="自律带来美丽"
           height={200}
        />

        <Card
          image={{uri:'http://image.tianjimedia.com/uploadImages/2011/253/437L1Y9HRN2U.jpg'}}>
          <Text style={{marginBottom: 10}}>
            The idea with React Native Elements is more about component structure than actual design.
          </Text>
          <Button
            icon={{name: 'code'}}
            backgroundColor='#03A9F4'
            buttonStyle={{borderRadius: 0, marginLeft: 0, marginRight: 0, marginBottom: 0}}
            title='登录'
            onPress={() => this.props.navigation.navigate('Login')} />
        </Card>

        <Card
          title='热门套餐'
          image={{uri:'http://image.tianjimedia.com/uploadImages/2011/253/437L1Y9HRN2U.jpg'}}>
          <Text style={{marginBottom: 10}}>
            The idea with React Native Elements is more about component structure than actual design.
          </Text>
          <Button
            icon={{name: 'code'}}
            backgroundColor='#03A9F4'
            buttonStyle={{borderRadius: 0, marginLeft: 0, marginRight: 0, marginBottom: 0}}
            title='VIEW NOW' />
        </Card>

        <PricingCard
          color='#4f9deb'
          title='Free'
          price='$0'
          info={['1 User', 'Basic Support', 'All Core Features']}
          button={{ title: 'GET STARTED', icon: 'flight-takeoff' }}
        />
      </ScrollView>
    )
  }
}

const HomeTab = StackNavigator({
  Home: {
    screen: Home,
  },
  Login: {
    path: 'login',
    screen: LoginView,
  },
});


export {HomeTab}

import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import { Card, PricingCard, ListItem, Button, Tile } from 'react-native-elements';
import { FormLabel, FormInput } from 'react-native-elements'

class LoginView extends React.Component {
  render() {
    return (
      <View>
        <FormLabel containerStyle={styles.labelContainerStyle}>
          Name
        </FormLabel>
        <FormInput
          ref="form2"
          containerRef="containerRefYOYO"
          textInputRef="textInputRef"
          placeholder="Please enter your name..."
        />
        <FormLabel
          textInputRef="textInputRef"
          containerStyle={styles.labelContainerStyle}
        >
          Address
        </FormLabel>
        <FormInput
          textInputRef="textInputRef"
          ref="form1"
          placeholder="Please enter your address..."
        />
        <FormLabel
          textInputRef="textInputRef"
          containerStyle={styles.labelContainerStyle}
        >
          Phone
        </FormLabel>
        <FormInput
          textInputRef="textInputRef"
          placeholder="Please enter your phone number..."
        />
        <Button
          onPress={() => console.log('yo')}
          icon={{ name: 'done' }}
          buttonStyle={{ marginTop: 15 }}
          title="SUBMIT"
        />
      </View>
    )
  }
}

const styles = StyleSheet.create({
  headingContainer: {
    justifyContent: 'center',
    alignItems: 'center',
    padding: 40,
    backgroundColor: '#00B233',
  },
  heading: {
    color: 'white',
    marginTop: 10,
    fontSize: 22,
  },
  labelContainerStyle: {
    marginTop: 8,
  },
});

export {LoginView}

效果如下：

Home

点击登录后，通过Stack Navigator跳转到登录页面

Login

由于我们的 Home 和 Login 都在 HomeTab 里， HomeTab 又是在 App 的 Tab Navigator 中，所以此处的 Login 页面下方也会有 Tab 在。