我在使用React Native Redux时遇到问题，我从TextField内部的onChangeText函数调用Redux动作。通常，这样的更新只会导致TextField本身更新，但是每次调用该函数时都会重新呈现整个页面。
这是TextField的代码。有问题的方法是 this.props.updateURL（value）
<TextField label='Server'
value={this.props.profile.url}
labelFontSize={textFont(16)}
tintColor='#B3B2B6'
autoCapitalize="none"
autoCorrect={false}
returnKeyType={'next'}
blurOnSubmit={false}
autoFocus={!this.props.profile.edited}
style={styles.inputStyle}
selectionColor={CUSRSOR_COLOR}
editable={!this.props.profile.edited}
onChangeText={async value => {
this.props.updateURL(value)
}}
renderAccessory={()=>{
return(<TouchableOpacity onPress={this.handleScanPress} >
<Image source={ImgScan} style={{height: 25, width: 25, overflow:'visible', marginBottom:20, marginRight: 10}}/>
</TouchableOpacity>);
}}
>
</TextField>
这用于Redux方法mapStateToProps和mapDispatchToProps：
const mapStateToProps = (state) => {
return {
profile : state.profileReducer,
deviceUid: state.GlobalReducer.deviceUid,
locationsList: state.LogsReducer.locationList,
errorList: state.ErrorsReducer.failedList,
watermarkText: state.GlobalReducer.watermarkText,
alertPresent: state.LogsReducer.alertPresent
}
};
const mapDispatchToProps = (dispatch) => {
return {
updateURL : (url) => dispatch(updateURL(url)),
updateUserName : (userName) => dispatch(updateUserName(userName)),
updatePassword : (password) => dispatch(updatePassword(password)),
updateDeviceName : (deviceName) => dispatch(updateDeviceName(deviceName)),
allFieldsEntered : (url,userName,password) => dispatch(allFieldsEntered(url,userName,password)),
loginDevice: (url,userName,password,deviceName,deviceId,navigation,existingUser) => dispatch(callLoginApi(url,userName,password,deviceName,deviceId,navigation,existingUser)),
updateFailureMessage: (message) => dispatch(updateFailureMessage(message)),
showLoader: () => dispatch(showLoader()),
hideLoader: () => dispatch(hideLoader()),
updateRegistrationSuccess: (value) => dispatch(updateRegistrationSuccess(value)),
checkForInternet: () => dispatch(checkConnectivity()),
getProfileDetails: async(isToken) => await dispatch(fetchProfileDetails(isToken)),
updateLocationSwitch: (value) => dispatch(updateLocationStatus(value)),
updateIsEdit: (value) => dispatch(updateIsEdit(value)),
storeRegistrationFlagInAsync: () => dispatch(storeRegistrationFlagInAsync()),
isDeviceConnected: (value) => dispatch(isDeviceConnected(value)),
requestLocationPermissions: () => dispatch(requestLocationPermissions()),
passwordChanged: (value) => dispatch(updateIsPasswordChanged(value)),
isEditPage: (value) => dispatch(isEditPage(value)),
getDeviceName: () => dispatch(getDeviceName()),
shouldEnableLocation: (value) => dispatch(shouldEnableLocation(value)),
fetchLocationList: () => dispatch(fetchLocations()),
syncRecords: (url,userName,password,locationList,deviceId,isFromError,shouldPresentErrorMsg) => dispatch(syncFailedRecords(url,userName,password,locationList,deviceId,isFromError,shouldPresentErrorMsg)),
fetchFailedRecords: (shouldShowLoader) => dispatch(fetchFailedRecords(shouldShowLoader)),
updateDeviceAction: (action,deviceId,url) => dispatch(performDeviceAction(action,deviceId,url)),
callLogoutApi: (userName,password) => dispatch(callLogoutApi(userName,password)),
syncDeviceActions: () => dispatch(syncDeviceActions()),
syncPendingUpdates: (url,userName,password,deviceId) => dispatch(syncPendingUpdates(url,userName,password,deviceId)),
fetchPendingLocationsList: () => dispatch(fetchPendingLocationsList()),
showPasswordChangeAlert: (alertFlag,navigation) => dispatch(handleUIForPasswordChange(alertFlag,navigation)),
}
}
export default connect(mapStateToProps,mapDispatchToProps)(Profile);
以下是减速器：
const initialState = {
url: '',
userName : '',
password : '',
deviceName : '',
resourceCode : '',
isDeviceConnected : false,
allFieldsFilled: false,
token: '',
gpsTrackingInterval : 5,
apiPostingInterval : 30,
failureMessage : '',
registered : false,
edited: false,
editPage: false,
isConnected: true,
shouldEnableLocation: false,
resourceDesc: '',
adminEmail: '',
companyName: ''
}
const profileReducer = (state=initialState,action) => {
switch (action.type) {
case actionTypes.UPDATE_URL :
return {
...state,
url: action.payload
}
...
}
这是Redux动作：
export const updateURL = (url) => {
return {
type: actionTypes.UPDATE_URL,
payload: url
};
};
任何帮助将不胜感激。
import React, { Component } from 'react';
import {
StyleSheet, Text, View, TextInput, TouchableOpacity, Image,
KeyboardAvoidingView, ScrollView, SafeAreaView, Linking
} from 'react-native';
import { COLOR_BLACK, COLOR_GRAY_9, COLOR_TRANSPARENT, COLOR_GRAY_4 } from '../../../constants/colors';
import ImgProntoLogo from '../../../assets/images/pronto-logo.png';
import ImgPasswordVisibleIcon from '../../../assets/images/visibility.png';
import ImgUrl from '../../../assets/images/url.png';
import ImgBarcode from '../../../assets/images/scan-barcode.png';
import ImgUsernameIcon from '../../../assets/images/username.png';
import ImgPasswordIcon from '../../../assets/images/password.png';
import ImgPasswordHide from '../../../assets/images/password-hide.png';
import GlobalStyleSheet from '../../../constants/styles';
import {
PASSWORD, USERNAME, URL_CONNECT
} from '../../../constants/strings';
import { StackActions, NavigationActions } from 'react-navigation';
import Sync from '../../../utils/Syncing';
import { AsyncStorage } from 'react-native';
export default class Configuration extends Component {
constructor(props) {
super(props)
this.handleOpenURL = this.handleOpenURL.bind(this);
this.handleScanPress = this.handleScanPress.bind(this);
}
async componentWillMount() {
this.props.clearConfiguration();
this.props.checkConnectivity();
Linking.addEventListener('url', this.handleOpenURL);
Sync.removeDataFromUserTable();
Sync.removeDataFromCompanyTable();
}
componentDidMount() {
console.log("COMPONENT MOUNTING");
Linking.getInitialURL().then((url) => {
if (url) {
url = url.substring(18);
this.props.updateURL(url);
}
}).catch(err => console.error('An error occurred', err))
}
componentWillReceiveProps(props) {
console.log("WILL RECEIVE")
}
handleOpenURL = (event) => {
this.props.updateURL(event.url.substring(18))
}
copyRights() {
var currentYear = new Date().getFullYear().toString();
return '© '.concat(currentYear).concat(' Pronto Software Limited.All Rights Reserved.');
}
// Connect the device to the pronto connect
async connectDevice() {
this.props.showLoader();
this.props.resetConnectPasswordVisibility();
await this.props.connectDevice(this.props.configuration.url,
this.props.configuration.username, this.props.configuration.password);
let isDeviceConnected = await AsyncStorage.getItem("isConnected");
if (isDeviceConnected === "true") {
const resetAction = StackActions.reset({
index: 0,
actions: [NavigationActions.navigate({ routeName: 'Register' })],
});
this.props.navigation.dispatch(resetAction);
}
this.props.hideLoader();
}
static navigationOptions = {
header: null
}
handleScanPress() {
const action = StackActions.reset({
index: 0,
actions: [NavigationActions.navigate({ routeName: 'Scanner' })],
});
this.props.navigation.push('Scanner');
}
render() {
return (
<SafeAreaView style={GlobalStyleSheet.container}>
<KeyboardAvoidingView style={GlobalStyleSheet.container} >
<View style={styles.headerLogoView}>
<Image source={ImgProntoLogo} style={styles.logo} />
</View>
<ScrollView keyboardShouldPersistTaps="handled" style={styles.scrollViewStyle}>
<View style={{ flex: 1, height: '100%' }}>
<View style={styles.viewContainer}>
<Text style={[GlobalStyleSheet.textHeading4, GlobalStyleSheet.marginTop10,
GlobalStyleSheet.marginBottom10]}>CONFIGURE DEVICE</Text>
<View style={[GlobalStyleSheet.textInputView, GlobalStyleSheet.marginBottom10]}>
<Image style={GlobalStyleSheet.iconInputBar} source={ImgUrl} />
<TextInput
underlineColorAndroid={COLOR_TRANSPARENT}
style={GlobalStyleSheet.textInput}
autoCapitalize='none'
placeholder={URL_CONNECT}
value={this.props.configuration.url}
onChangeText={(value) => { this.props.updateURL(value) }}
editable={!(this.props.configuration.isDeviceConnected)}
/>
<TouchableOpacity style={[GlobalStyleSheet.passwordTouchable]} onPress={this.handleScanPress}>
<Image style={[GlobalStyleSheet.passwordShowHideIcon]} source={ImgBarcode} />
</TouchableOpacity>
</View>
<View style={[GlobalStyleSheet.textInputView, GlobalStyleSheet.marginBottom10]}>
<Image style={GlobalStyleSheet.iconInputBar} source={ImgUsernameIcon} />
<View style={[GlobalStyleSheet.flexRow, { flex: 1 }]}>
<TextInput
placeholder={USERNAME}
underlineColorAndroid={COLOR_TRANSPARENT}
style={GlobalStyleSheet.textInput}
onChangeText={(value) => { this.props.updateUsername(value) }}
editable={!(this.props.configuration.isDeviceConnected)}
/>
</View>
</View>
<View style={[GlobalStyleSheet.textInputView, GlobalStyleSheet.marginBottom10]} >
<Image style={[GlobalStyleSheet.iconInputBar]} source={ImgPasswordIcon} />
<View style={[GlobalStyleSheet.flexRow, { flex: 1 }]}>
<TextInput
placeholder={PASSWORD}
underlineColorAndroid={COLOR_TRANSPARENT}
contextMenuHidden={true}
style={GlobalStyleSheet.textInput}
autoCapitalize='none'
onChangeText={(value) => { this.props.updatePassword(value) }}
editable={!(this.props.configuration.isDeviceConnected)}
secureTextEntry={!(this.props.configuration.passwordVisibility)} />
<TouchableOpacity style={[GlobalStyleSheet.passwordTouchable]}
onPress={() => {
if (!this.props.configuration.isDeviceConnected) {
this.props.togglePasswordVisibility(this.props.configuration.passwordVisibility)
}
}}>
{
this.props.configuration.passwordVisibility ?
(<Image style={[GlobalStyleSheet.passwordShowHideIcon]} source={ImgPasswordVisibleIcon} />) :
(<Image style={[GlobalStyleSheet.passwordShowHideIcon]} source={ImgPasswordHide} />)
}
</TouchableOpacity>
</View>
</View>
{
this.props.configuration.isDeviceConnected ?
(
<TouchableOpacity style={GlobalStyleSheet.touchableBarProcessed} disabled={true} >
<Text style={GlobalStyleSheet.textTouchableBarProcessed}>CONNECTED</Text>
</TouchableOpacity>
) :
(this.props.configuration.url != "" &&
this.props.configuration.username != "" && this.props.configuration.password != "" ?
(
<TouchableOpacity style={[GlobalStyleSheet.touchableBarEnabled]}
onPress={async () => { await this.connectDevice() }}>
<Text style={GlobalStyleSheet.textTouchableBarEnabled}>CONNECT</Text>
</TouchableOpacity>
) :
(
<TouchableOpacity style={[GlobalStyleSheet.touchableBarDisabled]} disabled={true}>
<Text style={[GlobalStyleSheet.textTouchableBarDisabled]}>CONNECT</Text>
</TouchableOpacity>
)
)
}
</View>
</View>
<View style={styles.copyRightsView}>
<Text style={GlobalStyleSheet.copyRightsText}>{this.copyRights()}</Text>
</View>
</ScrollView>
</KeyboardAvoidingView >
</SafeAreaView >
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
height: '100%',
width: '100%',
backgroundColor: COLOR_GRAY_9,
},
headerLogoView: {
height: 50,
backgroundColor: COLOR_GRAY_9,
elevation: 5,
justifyContent: 'center',
alignItems: 'center',
marginBottom: 2,
shadowOffset: { width: 2, height: 2, },
shadowColor: COLOR_BLACK,
shadowOpacity: 0.1,
},
logo: {
height: 40,
width: '80%',
resizeMode: 'contain',
},
viewContainer: {
marginLeft: 15,
marginRight: 15,
paddingBottom: 10
},
copyRightsView: {
alignItems: 'center',
minHeight: 40,
paddingBottom: 5,
},
scrollViewStyle: {
flex: 1,
height: '100%',
paddingTop: 10
},
});