反应导航在其他 StackNavigator 中制作透明屏幕

Question

我在其他 StackNagigation 中遇到透明屏幕问题。 demo

单击 ScreenTwo 中的 Go to ScreenThree 按钮后，我想在 ScreenTwo 前面显示 ScreenThree 叠加层。

我已将cardStyle 设置为backgroundColor: 'transparent'，但它仍然无法正常工作。

我不知道这里有什么问题？有人请帮帮我吗？

import { StackNavigator } from 'react-navigation'; // 2.2.5


import React from 'react'
import { Image, View, Text, Button } from 'react-native'
import { StyleSheet, Dimensions, TouchableOpacity } from 'react-native'

export default class App extends React.Component {
  render() {
    return (
      <View style={{flex: 1, backgroundColor: 'red'}}>
        <Root/>
      </View>
    )
  }
}

class HomeScreen extends React.Component {

  render() {

    return (
      <View style={{
        backgroundColor: 'blue', 
        flex: 1, 
        justifyContent: 'center', 
        alignItems: 'center',
        paddingTop: 20
      }}>

      <TouchableOpacity onPress={
        () => { 
        this.props.navigation.navigate('ScreenTwo')}
      } 
      style={{
        padding: 16, 
        backgroundColor: 'gray'
      }}>
        <Text>
          Go to ScreenTwo
        </Text>
      </TouchableOpacity>
      </View>
      )
  }
}

class ScreenTwo extends React.Component {

  render() {

    return (
      <View style={{
        flex: 1, 
        justifyContent: 'center', 
        alignItems: 'center'
      }}>
        <Text style={{color: 'white'}}>
          ScreenTwo
        </Text>
        <TouchableOpacity onPress={
        () => { 
        this.props.navigation.navigate('ScreenThree')}
      } 
      style={{
        padding: 16, 
        backgroundColor: 'gray',
        marginTop: 16
      }}>
        <Text>
          Go to ScreenThree
        </Text>
      </TouchableOpacity>

      </View>
      )
  }
}

class ScreenThree extends React.Component {

  render() {

    return (
      <View style={{
        backgroundColor: 'rgba(0,0,0,0.3)', 
        flex: 1, 
        justifyContent: 'center', 
        alignItems: 'center'
      }}>
        <Text style={{color: 'white'}}>
          ScreenThree
        </Text>

      </View>
      )
  }
}

const DetailStack = StackNavigator({
  ScreenThree: {screen: ScreenThree}
}, {
  mode: 'modal',
    headerMode: 'none',
    cardStyle: {
      backgroundColor: 'transparent',
      shadowColor: 'transparent'
    },
})

const MainStack = StackNavigator({
  HomeScreen: {screen: HomeScreen},
  ScreenTwo: {screen: ScreenTwo},
DetailStack: {screen: DetailStack}
},
{
  headerMode: 'none',
  cardStyle: {shadowColor: 'transparent'},
})

const Root = StackNavigator({
  Main: {screen: MainStack}
},
{
    mode: 'modal',
    headerMode: 'none',
    cardStyle: {
      shadowColor: 'transparent'

    },
})

Answer 1

我也遇到了这个问题，我花了几天时间才找出原因。有两个不同的因素：

1. 我使用的是 react-navigator v3，cardStyle: { backgroundColor: 'transparent'} 没有帮助。所以我不得不选择transparentCard: true

2. 从开发工具检查和修改屏幕的backgroundColor 将显示所有屏幕背景为transparent，但它们仍然是白色的。所以我发现在屏幕过渡期间，过渡结束时的每个屏幕都会添加一个白色背景的容器（仅在 iOS 和 Web 中发生）。

   所以，我必须将这个过渡容器的背景也设置为透明 -> Source code

transitionConfig: () => ({
  containerStyle: {
    backgroundColor: 'transparent'
  }
})

另外需要注意的是您需要先将这 2 条规则应用于 非常顶级的导航器。然后你只需修改backgroundColor 为 无论您想要透明还是其他颜色的屏幕：D

Answer 2

将此粘贴​​到您的 ModalStackScreen 中。你可以像样板一样使用它。

<Stack.Navigator
  screenOptions={{
    headerShown: false,
    cardStyle: { backgroundColor: 'transparent' },
    cardOverlayEnabled: true,
    cardStyleInterpolator: ({ current: { progress } }) => ({
      cardStyle: {
        opacity: progress.interpolate({
          inputRange: [0, 0.5, 0.9, 1],
          outputRange: [0, 0.25, 0.7, 1],
        }),
      },
      overlayStyle: {
        opacity: progress.interpolate({
          inputRange: [0, 1],
          outputRange: [0, 0.5],
          extrapolate: 'clamp',
        }),
      },
    }),
  }}
  mode="modal"
>
  <Stack.Screen name="Home" component={HomeStack} />
  <Stack.Screen name="Modal" component={ModalScreen} />
</Stack.Navigator>

为了更清楚/详细阅读https://reactnavigation.org/docs/stack-navigator/它解释得很好

Answer 3

这对我有用 - 取自 Github issue。

// create custom transitioner without the opacity animation, ie. for iOS
function forVertical(props) {
  const { layout, position, scene } = props;

  const index = scene.index;
  const height = layout.initHeight;

  const translateX = 0;
  const translateY = position.interpolate({
    inputRange: ([index - 1, index, index + 1]: Array<number>),
    outputRange: ([height, 0, 0]: Array<number>)
  });

  return {
    transform: [{ translateX }, { translateY }]
  };
}

// set it as the transitionConfig param on your stack navigator
const App = StackNavigator(
  {
    Modal: { screen: Modal }
  },
  {
    mode: "modal",
    headerMode: "none",
    transitionConfig: () => ({ screenInterpolator: forVertical })
  }
);

Answer 4

这应该会给你你想要的东西

更新：transitionConfig 需要是一个函数，就我而言，我需要添加空的 screenInterpolator 函数。

const Root = StackNavigator({
  Main: {screen: MainStack}
},
{
    mode: 'modal',
    headerMode: 'none',
    cardStyle: {
      shadowColor: 'transparent'
    },
    transitionConfig: ({ scene }) => ({
      transitionSpec: {
        duration: 0,
        timing: Animated.timing,
        easing: Easing.step0,
      },
    screenInterpolator: screenProps => {
      return {}
    }
  })
})