我正在使用 React Native 开发一个移动应用程序,并在其中使用 Tab.Navigator - Tab.Screen 组件。在导航器中,我使用initialRouteName、tabBarOptions和screenOptions属性。在 javaScript 找到screenOptions之前,其他属性一切正常。然后它给我警报:
// Place the following in 'screenOptions' in your code to keep current behavior:
{
"tabBarStyle": [
{
"display": "flex"
},
null
]
}
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有关更多详细信息,请参阅https://reactnavigation.org/docs/bottom-tab-navigator#options。
我已经在我的代码中做到了:
const App = () => {
return (
<>
<NavigationContainer>
<Tab.Navigator
initialRouteName='ExerciseScreensStack'
tabBarOptions={{
tabBarActiveTintColor: '#efb810',
tabBarInactiveTintColor: 'black'
}}
screenOptions = {({ route }) =>({
tabBarStyle: [
{
display: "flex"
},
null
],
tabBarIcon: ({ color …Run Code Online (Sandbox Code Playgroud) (node:2564) UnhandledPromiseRejectionWarning: Error: Cannot find module 'yallist'
Require stack:
- C:\Users\23354\AppData\Roaming\npm\node_modules\npm\node_modules\lru-cache\index.js
- C:\Users\23354\AppData\Roaming\npm\node_modules\npm\node_modules\semver\classes\range.js
- C:\Users\23354\AppData\Roaming\npm\node_modules\npm\node_modules\semver\classes\comparator.js
- C:\Users\23354\AppData\Roaming\npm\node_modules\npm\node_modules\semver\index.js
- C:\Users\23354\AppData\Roaming\npm\node_modules\npm\lib\utils\unsupported.js
- C:\Users\23354\AppData\Roaming\npm\node_modules\npm\lib\cli.js
- C:\Users\23354\AppData\Roaming\npm\node_modules\npm\bin\npm-cli.js
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:902:15)
at Function.Module._load (internal/modules/cjs/loader.js:746:27)
at Module.require (internal/modules/cjs/loader.js:974:19)
at require (internal/modules/cjs/helpers.js:93:18)
at Object.<anonymous> (C:\Users\23354\AppData\Roaming\npm\node_modules\npm\node_modules\lru-cache\index.js:4:17)
at Module._compile (internal/modules/cjs/loader.js:1085:14)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
at Module.load (internal/modules/cjs/loader.js:950:32)
at Function.Module._load (internal/modules/cjs/loader.js:790:12)
at Module.require (internal/modules/cjs/loader.js:974:19)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:2564) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error
originated either by throwing inside of an async function …Run Code Online (Sandbox Code Playgroud) 我正在尝试拆分包含 python 函数的字符串,以便生成的输出将单独的函数保留为列表元素。
s='hello()there()'应该拆分为['hello()', 'there()']
为此,我使用正则表达式先行在右括号上拆分,但不在字符串末尾拆分。
虽然前瞻似乎有效,但我无法)按照各种帖子中的建议将结果保留在结果字符串中。简单地用正则表达式分割会丢弃分隔符:
import re
s='hello()there()'
t=re.split("\)(?!$)", s)
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这导致:'hello(', 'there()']。
s='hello()there()'
t=re.split("(\))(?!$)", s)
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将分隔符包装为一个组会导致)保留为一个单独的元素:与使用该函数的方法['hello(', ')', 'there()']
一样:filter()
s='hello()there()'
u = list(filter(None, re.split("(\))(?!$)", s)))
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再次导致括号作为单独的元素:['hello(', ')', 'there()']
如何拆分这样的字符串以使函数在输出中保持完整?
我是 React Native 的新手,我正在尝试执行简单的堆栈导航。我让它在应用程序的另一部分工作(用户身份验证步骤)。一旦用户登录,我的代码就会输入另一个堆栈。这个堆栈导航器嵌套了一个选项卡导航器,这可能会导致问题?
无论哪种方式,我都无法执行从我的个人资料屏幕到编辑个人资料屏幕的推送。代码如下。
import React from 'react'
import { NavigationContainer } from '@react-navigation/native';
import { createNativeStackNavigator } from '@react-navigation/native-stack';
import LoginScreen from './screens/LoginScreen';
import HomeScreen from './screens/HomeScreen';
import SignupScreen from './screens/SignupScreen';
import ProfileScreen from './screens/ProfileScreen';
import EditProfileScreen from './screens/EditProfileScreen';
import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
import Icon from 'react-native-vector-icons/Ionicons';
const Stack = createNativeStackNavigator()
const screenOptions = {
headerShown: false
}
export const SignedOutStack = () =\> (
\<NavigationContainer\>
\<Stack.Navigator
initialRouteName="LoginScreen"
screenOptions={screenOptions}
\\>
\<Stack.Screen
name="Login"
component={LoginScreen}
/\>
\<Stack.Screen
name='SignupScreen' …Run Code Online (Sandbox Code Playgroud)