React native 使用react本机元素更改主题不起作用?
我一直在与react native elements合作。我想在我的应用程序中实现暗模式,但由于某些原因,当我的上下文状态发生变化时,我无法使React native 使用react本机元素更改主题不起作用?,react-native,react-native-elements,React Native,React Native Elements,我一直在与react native elements合作。我想在我的应用程序中实现暗模式,但由于某些原因,当我的上下文状态发生变化时,我无法使中的主题道具发生变化 这是我的背景,我有我的黑暗主题和光明主题对象。我还有一个使用useState的LightTheEstate,这样我可以从子组件设置该状态 import React, { createContext, useState, useEffect } from "react"; import { AsyncStorage } from "re
中的主题道具发生变化
这是我的背景,我有我的黑暗主题和光明主题对象。我还有一个使用useState的LightTheEstate
,这样我可以从子组件设置该状态
import React, { createContext, useState, useEffect } from "react";
import { AsyncStorage } from "react-native";
import { ThemeProvider } from "react-native-elements";
import lightTheme from "../themes/light";
import darkTheme from "../themes/dark";
export const ThemeModeContext = createContext();
export const ThemeContextProvider = (props) => {
const [lightThemeState, setLightThemeState] = useState(true);
const saveThemeState = async () => {
if (lightThemeState) {
await AsyncStorage.removeItem("lightThemeState");
} else {
await AsyncStorage.setItem(
"lightThemeState",
JSON.stringify(lightThemeState)
);
}
};
const getThemeState = async () => {
currentMode = await AsyncStorage.getItem("lightThemeState");
if (currentMode) {
setLightThemeState(JSON.parse(currentMode));
}
};
useEffect(() => {
saveThemeState();
}, [lightThemeState]);
useEffect(() => {
getThemeState();
}, []);
const currentTheme = lightThemeState ? lightTheme : darkTheme;
console.log("LIGHT THEME STATE", lightThemeState);
// When I log this after I used the setLigthThemeState in a child component. It gives the correct state ie true or false.
console.log("COLOR OF THE THEMES BACKGROUND", currentTheme.colors.background);
// This also gives the correct background for the theme that is the "currentTheme" depending on the state. So this far, everything is correct.
return (
<ThemeModeContext.Provider value={[lightThemeState, setLightThemeState]}>
<ThemeProvider theme={currentTheme}>{props.children}</ThemeProvider>
</ThemeModeContext.Provider>
);
};
export default ThemeContextProvider;
也许你问的黑暗主题和光明主题有问题?否,如果我将状态从true更改为false并重新加载应用程序。它起作用了。
不知何故,
中的主题没有更新。有人能解释一下原因吗?您不能使用React原生元素动态更改主题。不幸的是,这一点在任何地方都没有被记录下来——这是一个重要的观点,因为大多数RNE用户都认为他们可以在运行时动态地更改整个主题(嗯,我做到了)
关于React Native Elements github,有几个已经解决的问题提到了这一点。
例如(2019年1月),其中一名开发人员表示:
目前这是不可能的。ThemeProvider不允许对其道具进行运行时更改。这是因为对ThemeProvider道具的更改将触发树下所有组件的重新加载
更新:
可以动态更改主题,但必须使用本机元素提供的HOC(例如,调用withTheme提供的updateTheme函数)。有一点额外的接线,但这是可行的。您可以在接近顶层的位置包装HOC,以便主题更新传播到所有子级。您不能使用React原生元素动态更改主题。不幸的是,这一点在任何地方都没有被记录下来——这是一个重要的观点,因为大多数RNE用户都认为他们可以在运行时动态地更改整个主题(嗯,我做到了)
关于React Native Elements github,有几个已经解决的问题提到了这一点。
例如(2019年1月),其中一名开发人员表示:
目前这是不可能的。ThemeProvider不允许对其道具进行运行时更改。这是因为对ThemeProvider道具的更改将触发树下所有组件的重新加载
更新:
可以动态更改主题,但必须使用本机元素提供的HOC(例如,调用withTheme提供的updateTheme函数)。有一点额外的接线,但这是可行的。您可以将HOC包装在接近顶层的位置,以便主题更新传播到所有子级。确切地说。
只是想补充一点,也可以使用useContext
如果您将组件包装为具有提供程序的级别,然后在希望能够更改主题的子组件中使用useContext
钩子,则可以提取updateTheme
,如下所示:
const{theme,updateTheme}=useContext(ThemeContext)代码>
这与starlabs的答案相同,但却是另一种方法,也是我做ut的方法。没错。
只是想补充一点,也可以使用useContext
如果您将组件包装为具有提供程序的级别,然后在希望能够更改主题的子组件中使用useContext
钩子,则可以提取updateTheme
,如下所示:
const{theme,updateTheme}=useContext(ThemeContext)代码>
这与starlabs的答案相同,但又是另一种方法,也是我使用ut的方法。为了使用react原生元素,我尝试动态更新它,但由于它在楼上的指定位置,更新它的唯一方法是这种方法,这是我第一次被迫以这种方式使用消费者XD:
//App.js
import 'react-native-gesture-handler';
import React from "react";
import { Provider } from "react-redux";
import { store } from "./redux";
import { TranslationProvider, ColorProvider } from "./context";
import { ThemeProvider } from "react-native-elements";
import { SafeAreaProvider } from "react-native-safe-area-context";
import { appTheme as theme } from './theme';
import App from "./navigation";
import ThemeConsumer from "./components/consumers/themeConsumer";
export default () =>
<Provider store={store}>
<SafeAreaProvider>
<TranslationProvider>
<ColorProvider>
<ThemeProvider theme={theme}>
<ThemeConsumer>
<App />
</ThemeConsumer>
</ThemeProvider>
</ColorProvider>
</TranslationProvider>
</SafeAreaProvider>
</Provider>
//themeConsumer.js
import React, { useContext, useEffect } from 'react';
import { ThemeContext } from "react-native-elements";
import { color } from '../../colors';
import { useTheme } from '../../context';
export default ({ children }) => {
const { updateTheme } = useContext(ThemeContext);
const { isDarkMode } = useTheme();
useEffect(() => {
updateTheme({ colors: color });
}, [isDarkMode()])
return (
<>
{children}
</>
)
}
//App.js
导入“反应本机手势处理程序”;
从“React”导入React;
从“react redux”导入{Provider};
从“/redux”导入{store};
从“/context”导入{TranslationProvider,ColorProvider};
从“react native elements”导入{ThemeProvider};
从“react native safe area context”导入{SafeAreaProvider};
从“/theme”导入{appTheme as theme};
从“/navigation”导入应用程序;
从“/components/consumers/ThemeConsumer”导入经济消费者;
导出默认值()=>
//themeConsumer.js
从“React”导入React,{useContext,useEffect};
从“react native elements”导入{ThemeContext};
从“../../colors”导入{color};
从“../../context”导入{useTheme};
导出默认值({children})=>{
const{updateTheme}=useContext(ThemeSecontext);
const{isDarkMode}=useTheme();
useffect(()=>{
更新名称({colors:color});
},[IsDakMode()])
返回(
{儿童}
)
}
为了使用react本机元素,我尝试动态更新它,但由于它位于最高层,所以更新它的唯一方法是这种方式,这是我第一次被迫以这种方式使用使用者XD:
//App.js
import 'react-native-gesture-handler';
import React from "react";
import { Provider } from "react-redux";
import { store } from "./redux";
import { TranslationProvider, ColorProvider } from "./context";
import { ThemeProvider } from "react-native-elements";
import { SafeAreaProvider } from "react-native-safe-area-context";
import { appTheme as theme } from './theme';
import App from "./navigation";
import ThemeConsumer from "./components/consumers/themeConsumer";
export default () =>
<Provider store={store}>
<SafeAreaProvider>
<TranslationProvider>
<ColorProvider>
<ThemeProvider theme={theme}>
<ThemeConsumer>
<App />
</ThemeConsumer>
</ThemeProvider>
</ColorProvider>
</TranslationProvider>
</SafeAreaProvider>
</Provider>
//themeConsumer.js
import React, { useContext, useEffect } from 'react';
import { ThemeContext } from "react-native-elements";
import { color } from '../../colors';
import { useTheme } from '../../context';
export default ({ children }) => {
const { updateTheme } = useContext(ThemeContext);
const { isDarkMode } = useTheme();
useEffect(() => {
updateTheme({ colors: color });
}, [isDarkMode()])
return (
<>
{children}
</>
)
}
//App.js
导入“反应本机手势处理程序”;
从“React”导入React;
从“react redux”导入{Provider};
从“/redux”导入{store};
从“/context”导入{TranslationProvider,ColorProvider};
从“react native elements”导入{ThemeProvider};
从“react native safe area context”导入{SafeAreaProvider};
从“/theme”导入{appTheme as theme};
从“/navigation”导入应用程序;
从“/components/consumers/ThemeConsumer”导入经济消费者;
导出默认值()=>
import React, { useContext, useState } from "react";
import { StyleSheet, View, Text } from "react-native";
import { LayoutView, ContainerView } from "../../components/styles";
import { ThemeModeContext } from "../../../store/themeStore";
import { Card, ListItem, Avatar, ThemeContext } from "react-native-elements";
import CustomButton from "../../components/CustomButton";
const INITIAL_PERSONAL_INFO_STATE = {
name: "",
username: "",
profileImage: "",
favoriteDestinations: [],
};
const MoreModal = (props) => {
const [personalInfo, setPersonalInfo] = useState(INITIAL_PERSONAL_INFO_STATE);
const [lightThemeState, setLightThemeState] = useContext(ThemeModeContext);
const { theme } = useContext(ThemeContext);
const { navigate } = props.navigation;
const primaryColor = theme.colors.background;
console.log("COLOR IN COMPONENT", primaryColor);
// The color is from the previous theme and even thou the state has changed in the state below
console.log("LIGHT THEME STATE IN COMPONENT", lightThemeState);
return (
<LayoutView primaryColor={theme.colors.background}>
<ContainerView>
<View>
</View>
<Card
title={"Settings"}
>
<ListItem
title="Light mode"
switch={{
value: lightThemeState,
onValueChange: (value) => setLightThemeState(value),
// Here is where I set lighThemeState to false in my context
}}
bottomDivider
</Card>
</ContainerView>
<CustomButton title={"Sign in"}></CustomButton>
</LayoutView>
);
};
export default MoreModal;
//App.js
import 'react-native-gesture-handler';
import React from "react";
import { Provider } from "react-redux";
import { store } from "./redux";
import { TranslationProvider, ColorProvider } from "./context";
import { ThemeProvider } from "react-native-elements";
import { SafeAreaProvider } from "react-native-safe-area-context";
import { appTheme as theme } from './theme';
import App from "./navigation";
import ThemeConsumer from "./components/consumers/themeConsumer";
export default () =>
<Provider store={store}>
<SafeAreaProvider>
<TranslationProvider>
<ColorProvider>
<ThemeProvider theme={theme}>
<ThemeConsumer>
<App />
</ThemeConsumer>
</ThemeProvider>
</ColorProvider>
</TranslationProvider>
</SafeAreaProvider>
</Provider>
//themeConsumer.js
import React, { useContext, useEffect } from 'react';
import { ThemeContext } from "react-native-elements";
import { color } from '../../colors';
import { useTheme } from '../../context';
export default ({ children }) => {
const { updateTheme } = useContext(ThemeContext);
const { isDarkMode } = useTheme();
useEffect(() => {
updateTheme({ colors: color });
}, [isDarkMode()])
return (
<>
{children}
</>
)
}