Image Picker 在 React Native 应用程序中不起作用,为啥?
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【中文标题】Image Picker 在 React Native 应用程序中不起作用,为啥?【英文标题】:Image Picker not working in React Native app, why?Image Picker 在 React Native 应用程序中不起作用,为什么? 【发布时间】:2019-01-24 18:01:46 【问题描述】:我已经成功安装了 react-native-image-picker,对于一个全新的 react native 应用程序,将其链接并通过 info.plist 文件授予正确的权限以访问相机、照片等...
我在 react-native-image-picker 页面上使用自述文件中的代码,但收到错误消息
当尝试 openGallery() 时,我收到以下警告并且没有图像库打开:
可能出现未处理的 Promise Rejection TypeError; undefined 不是函数(靠近...reactNativeImagePicker.default.launchImageLibrary...)
这是我的代码:
import ImagePicker from 'react-native-image-picker';
.....
class App extends Component
constructor(props)
super(props)
this.state =
fileURL: '',
//function
openGallery = async () =>
const options =
mediaType: 'video'
ImagePicker.launchImageLibrary(options, (response) =>
console('Response = ', response);
if(response.didCancel)
console.log('User cancelled image picker');
else
this.setState( fileURL: response.uri );
);
render()
return (
<View style=styles.container>
<Button
style=margin: 20
onPress=this.openGallery
title='Open Gallery'
backgroundColor='blue'
/>
</View>
);
它运行的磨坊样板代码。怎么回事?
@BoredKid,我在控制台日志中得到了这个:
对于(ImagePicker):
showImagePicker: ƒ
showImagePicker: ƒ showImagePicker(options, callback)
__proto__: Object
for (ImagePicker.showImagePicker);
ƒ showImagePicker(options, callback)
if (typeof options === 'function')
callback = options;
options = ;
return ImagePickerManager.showImagePicker((0, _objectS…
【问题讨论】:
这是在模拟器还是真机上? ios、android 还是两者兼有? 在 Mac (iPhone X) 上的 iOs 模拟器上,根本不使用 Expo 【参考方案1】:而不是写
import ImagePicker from 'react-native-image-picker',
你应该声明(在同一个地方)...
var ImagePicker = require('react-native-image-picker');
这对我有用。
【讨论】:
【参考方案2】:该模块没有默认导出。您需要使用命名导出:
import * as ImagePicker from 'react-native-image-picker';
或
import launchImageLibrary from 'react-native-image-picker';
【讨论】:
【参考方案3】:使用新输入更新:您的ImagePicker
对象没有launchImageLibrary
也没有launchCamera
。您的安装有问题... 可能是安装不正常,或者您的某个步骤出错了。让我们尝试重新安装,我们会看到问题仍然存在
【讨论】:
完美,从 Oct2018 回滚到 v0.27.0,一切正常:D 仍然不知道为什么当我按照完全相同的过程进行安装时最新的 v0.28.0 不起作用。现在“乐趣”开始了:react-native-video-processing 感谢您帮助我更深入地研究这个问题 :) 不只是重新安装,我必须确保我安装了最新版本,对我来说最新版本是:“react-native-image-picker”:“^3.3.2”,【参考方案4】:我通过安装最新版本解决了这个错误,对我来说是
"react-native-image-picker": "^3.3.2",
并且还使用存储库中的示例代码: https://github.com/react-native-image-picker/react-native-image-picker/blob/main/example/src/App.js
import React, useState, useEffect from 'react';
import StyleSheet, Text, View, Image from 'react-native';
import cameraImage from '../../../../assets/icons/camera.png';
import galleryImage from '../../../../assets/icons//gallery.png';
import TouchableWithoutFeedback from 'react-native-gesture-handler';
import * as ImagePicker from 'react-native-image-picker';
import PermissionsAndroid from 'react-native';
const ImagePicker = () =>
const [responseCamera, setResponseCamera] = React.useState(null);
const [responseGallery, setResponseGallery] = React.useState(null);
const openCameraWithPermission = async () =>
try
const granted = await PermissionsAndroid.request(
PermissionsAndroid.PERMISSIONS.CAMERA,
title: 'App Camera Permission',
message: 'App needs access to your camera ',
buttonNeutral: 'Ask Me Later',
buttonNegative: 'Cancel',
buttonPositive: 'OK',
,
);
if (granted === PermissionsAndroid.RESULTS.GRANTED)
ImagePicker.launchCamera(
mediaType: 'photo',
includeBase64: false,
maxHeight: 200,
maxWidth: 200,
,
(response) =>
console.log(response);
setResponseCamera(response);
setResponseGallery(null);
,
);
else
console.log('Camera permission denied');
catch (err)
console.warn(err);
;
return (
<View
style=
display: 'flex',
flexDirection: 'row',
justifyContent: 'space-around',
margin: 4,
>
<TouchableOpacity onPress=() => openCameraWithPermission()>
responseCamera === null ? (
<Image style=styles.icon source=cameraImage />
) : (
<Image style=styles.icon source=uri: responseCamera.uri />
)
</TouchableOpacity>
<TouchableOpacity
onPress=() =>
ImagePicker.launchImageLibrary(
mediaType: 'photo',
includeBase64: false,
maxHeight: 200,
maxWidth: 200,
,
(response) =>
setResponseGallery(response);
setResponseCamera(null);
,
)
>
responseGallery === null ? (
<Image style=styles.icon source=galleryImage />
) : (
<Image style=styles.icon source=uri: responseGallery.uri />
)
</TouchableOpacity>
</View>
);
;
const styles = StyleSheet.create(
icon:
height: 50,
width: 50,
,
);
export default ImagePicker;
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-feature android:name="android.hardware.camera" />
【讨论】:
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