react-navigation使用redux-saga等处理各种跳转、清除堆栈、返回不同页面的问题

一直没有找到有关于 react-navigation 处理app各种不同状态需要默认不同首页的例子，于是只能自己写了。

整个思路大概是这样的: 默认设置一个空页面为root页，根据需求rest至其他页面。

以下完整代码已放在github

实现效果图

ios效果

ios效果

安卓效果

路由设置

AppNavigation.js

// 用户token有效时默认
export const INITIAL_AUTHEN_ROUTE_NAME = 'Tab'
// 未登录时默认
export const INITIAL_UNAUTHEN_ROUTE_NAME = 'SignIn'
// 引导页首页
export const APPINTRO_ROUTE_NAME = 'AppIntro'
// 其他情况下的首页
...

// 登陆后的路由
const AUTHEN_ROUTES = {
  [INITIAL_AUTHEN_ROUTE_NAME]: { screen: TabNavigation },
  Jump1: { screen: Jump1 },
  Jump2: { screen: Jump2 }
}

export function isAuthenRouteName (routeName) {
  return !!AUTHEN_ROUTES[routeName]
}

// 无需登陆的路由
const UNAUTHEN_ROUTES = {
  SignIn: { screen: SignIn },
  Register: { screen: Register }
}

export function isUnauthenRouteName (routeName) {
  return !!UNAUTHEN_ROUTES[routeName]
}

// 其他特殊情况的路由
const GLOBAL_SCREEN = {
  AppIntro: { screen: AppIntro }
}

// 整个App路由整合
export const AppNavigation = StackNavigator({
  Launcher: { screen: Launcher },
  ...AUTHEN_ROUTES,
  ...UNAUTHEN_ROUTES,
  ...GLOBAL_SCREEN
}, {
  initialRouteName: 'Launcher',
  gesturesEnabled: true,
  headerMode: 'none',
  transitionConfig: () => ({
    screenInterpolator: CardStackStyleInterpolator.forHorizontal
  })
})

处理安卓返回多次问题

AppNavigation.js

const defaultGetStateForAction = AppNavigation.router.getStateForAction
AppNavigation.router.getStateForAction = (action, state) => {
  const { type, routeName } = action

  // jump twice
  if (state &&
    type === NavigationActions.NAVIGATE &&
    routeName === state.routes[state.routes.length - 1].routeName
  ) return null
  
  ...

  return defaultGetStateForAction(action, state)
}

处理返回至某个堆栈

AppNavigation.js

const defaultGetStateForAction = AppNavigation.router.getStateForAction
AppNavigation.router.getStateForAction = (action, state) => {
  const { type, routeName } = action

  ...

  // back to one stack
  if (state && type === NavigationActions.BACK) {
    const backRoute = state.routes.find(route => route.routeName === action.key)
    if (backRoute) {
      const backRouteIndex = state.routes.indexOf(backRoute)
      const route = {
        ...state,
        routes: state.routes.slice(0, backRouteIndex + 1),
        index: backRouteIndex
      }
      return route
    }
  }

  return defaultGetStateForAction(action, state)
}

根据不同状态设置不同根路径

NavigationSagas.js

import { put, select } from 'redux-saga/effects'
import { NavigationActions } from 'react-navigation'

import {
  isAuthenRouteName,
  isUnauthenRouteName,
  INITIAL_AUTHEN_ROUTE_NAME,
  INITIAL_UNAUTHEN_ROUTE_NAME,
  APPINTRO_ROUTE_NAME
} from '../Navigation/AppNavigation'

export function * redirectFlow () {
  const state = yield select()

  const authenticated = state.user.isLoggedIn
  const app = state.app

  const index = state.nav.index
  const routeName = state.nav.routes[index].routeName

  const redirectRoute = (name, childRouteName) => NavigationActions.reset({
    index: 0,
    actions: [
      NavigationActions.navigate({ routeName: name })
    ]
  })
  
  // 需要引导页时
  if (!app.hasReadAppintro) {
    yield put(redirectRoute(APPINTRO_ROUTE_NAME))
  }
  ...
  else {
    // 用户登陆时
    if (authenticated && !isAuthenRouteName(routeName)) {
      yield put(redirectRoute(INITIAL_AUTHEN_ROUTE_NAME))
      
    // 用户未登录时
    } else if (!authenticated && !isUnauthenRouteName(routeName)) {
      yield put(redirectRoute(INITIAL_UNAUTHEN_ROUTE_NAME))
    }
  }
  // 利用启动页遮盖跳转过程
  // SplashScreen.hide()
}

跳转后清除某些堆栈

NavigationSagas.js

// routeName 为要跳转的栈
export function * resetFlow ({ routeName, stackName }) {
  const state = yield select()

  let routes = []

  // 清除 堆栈中 stackName 到 routeName 之间的堆栈
  if (stackName) {
    for (let i = 0; i < state.nav.routes.length; i++) {
      routes.push(state.nav.routes[i])
      if (state.nav.routes[i].routeName === stackName) break
    }
  } else {
    routes = state.nav.routes
  }

  let actions = routes.map((item, key) =>
    key === (routes.length - 1)
    ? NavigationActions.navigate({ routeName: routeName })
    : NavigationActions.navigate({ routeName: item.routeName })
  )

  const redirectRoute = NavigationActions.reset({
    index: actions.length - 1,
    actions: actions
  })

  yield put(redirectRoute)
}

android 返回键处理

RootContainer.js

_BackHandler = () => {
  BackHandler.addEventListener('hardwareBackPress', () => {
    const { routes } = this.props.nav
    if (routes.length > 1) {
      this.props.goBack({ key: routes[routes.length - 1]['key'] })
      return true
    }
    // if in root, < 2s
    if (this.lastBackPressed && (this.lastBackPressed + 2000 >= Date.now())) {
      BackHandler.exitApp()
      return true
    }
    this.lastBackPressed = Date.now()
    Toast.show('again quit')
    return true
  })
}