我有以下问题，我有复选框列表，我无法维持其状态，我必须在this.state中创建一个数组，但它 没用。
在这段代码中，我循环存储要在屏幕上呈现的复选框，同时在checked属性中我尝试保持复选框状态
<Checkbox
name={'check'+item.id_camada}
checked={
this.state
.checkBoxCheckedArray
[this.state.checkBoxCheckedArray
[this.props.name.replace("check","")].id].checked
}
size={30}
style={{backgroundColor: '#f2f2f2', color:'blue', borderRadius:
5}}
onChange={(name, checked) =>
this._onSelectCamada(name,item.id_camada, checked)}/>
在另一部分中，我尝试更改复选框的状态，并在数据库中检索后包括标记
_onSelectCamada=(name,value, checked) =>{
this.state.checkBoxCheckedArray[value].checked = !checked;
this.state.checkBoxCheckedArray[value].id = value;
let formData = new FormData();
formData.append('acao', 'getMarcadores');
formData.append('id_camada', value);
let options = {
method: 'POST',
headers: {
Accept: 'multipart/form-data',
'Content-Type': 'multipart/form-data',
},
body: formData,
};
fetch(URL + "/pesquisar_camada.php", options).then((response) => response.json())
.then((responseJson) => {
// console.log("log::"+responseJson);
for (let json of responseJson) {
this.markers.push(json);
}
this.setState({
markers: this.markers,
checkBoxCheckedArray:this.state.checkBoxCheckedArray
});
})
.catch((error) => {
console.error(error);
});
}
完整代码：
import React, {Component} from 'react';
import {
Text,
TextInput,
View,
StyleSheet,
TouchableHighlight,
Modal,
Alert,
Dimensions,
ScrollView,
Picker,
AsyncStorage
} from 'react-native';
import MapView, {PROVIDER_GOOGLE} from 'react-native-maps';
import {Toolbar, COLOR, ThemeProvider} from 'react-native-material-ui';
import CardView from 'react-native-cardview' ;
import deviceLog, {LogView, InMemoryAdapter} from 'react-native-device-log';
import FormData from 'FormData';
import {Button} from 'react-native-elements'
import Checkbox from 'react-native-custom-checkbox';
const uiTheme = {
palette: {
primaryColor: COLOR.blue500,
},
toolbar: {
container: {
height: 50,
},
},
};
const {width, height} = Dimensions.get('window');
const ASPECT_RATIO = width / height;
const LATITUDE_DELTA = 0.0922;
const LONGITUDE_DELTA = LATITUDE_DELTA * ASPECT_RATIO;
const LATITUDE = -1.444892;
const LONGITUDE = -48.468348;
let URL = "http://mentorsites.com.br/w3gcon_mapas";
deviceLog.init(AsyncStorage /* You can send new InMemoryAdapter() if you do not want to persist here*/
, {
//Options (all optional):
logToConsole: false, //Send logs to console as well as device-log
logRNErrors: true, // Will pick up RN-errors and send them to the device log
maxNumberToRender: 2000, // 0 or undefined == unlimited
maxNumberToPersist: 2000 // 0 or undefined == unlimited
}).then(() => {
//When the deviceLog has been initialized we can clear it if we want to:
//deviceLog.clear();
});
//The device-log contains a timer for measuring performance:
deviceLog.startTimer('start-up');
export default class App extends Component {
constructor(props) {
super(props);
this.state = {
markers: [],
isPainelCamadaVisivel: false,
areas: [],
camadas: [],
check:false,
checkBoxCheckedArray : []
};
this.mapRef = null;
this.markers = [];
this.checkBoxArray = [];
}
componentDidMount() {
setTimeout(function () {
fetch(URL + '/lista_areas.php')
.then((response) => response.json())
.then((responseJson) => {
this.setState({
areas: responseJson
});
})
.catch((error) => {
console.error(error);
});
}.bind(this), 3000);
};
renderIf = (condition, content) => {
if (condition) {
return content;
} else {
return null;
}
};
clickBtnFecharDialogBusca = () => {
this.setState({
isPainelCamadaVisivel: false
});
if (this.getLatLng().length > 0) {
this.mapRef.fitToCoordinates(this.getLatLng(), {
edgePadding: {
top: 10,
right: 10,
bottom: 10,
left: 10
}, animated: false
})
}
}
_onSelectCamada=(name,value, checked) =>{
this.state.checkBoxCheckedArray[value].checked = !checked;
this.state.checkBoxCheckedArray[value].id = value;
let formData = new FormData();
formData.append('acao', 'getMarcadores');
formData.append('id_camada', value);
let options = {
method: 'POST',
headers: {
Accept: 'multipart/form-data',
'Content-Type': 'multipart/form-data',
},
body: formData,
};
fetch(URL + "/pesquisar_camada.php", options).then((response) => response.json())
.then((responseJson) => {
// console.log("log::"+responseJson);
for (let json of responseJson) {
this.markers.push(json);
}
this.setState({
markers: this.markers,
checkBoxCheckedArray:this.state.checkBoxCheckedArray
});
})
.catch((error) => {
console.error(error);
});
}
onValueChangeEscolhaArea(itemValue, itemIndex) {
this.setState({PickerValue: itemValue});
if (itemValue && itemValue != "-1") {
let formData = new FormData();
formData.append('acao', 'listar');
formData.append('id_grupo', itemValue);
this.checkBoxArray = [];
let options = {
method: 'POST',
headers: {
Accept: 'multipart/form-data',
'Content-Type': 'multipart/form-data',
},
body: formData,
};
fetch(URL + "/pesquisar_camada.php", options).then((response) => response.json())
.then((responseJson) => {
this.setState({camadas: responseJson});
})
.catch((error) => {
console.error(error);
});
}
}
getLatLng = () => {
markersTmp = [];
for (let marker of this.state.markers) {
markersTmp.push({latitude: marker.lat, longitude: marker.lng});
}
return markersTmp;
};
render() {
let areasItems = this.state.areas.map((item, index) => {
return <Picker.Item key={item.id} value={item.id} label={item.nome_grupo}/>
});
areasItems.unshift(<Picker.Item key="-1" value="-1" label="-Selecione a área-"/>);
let camadasItems = [];
for(let item of this.state.camadas){
this.state.checkBoxCheckedArray[item.id_camada]={
id:0,
checked:false
};
let checkbox = <Checkbox
name={'check'+item.id_camada}
checked={
this.state.checkBoxCheckedArray[this.state.checkBoxCheckedArray[this.props.name.replace("check","")].id].checked
}
size={30}
style={{backgroundColor: '#f2f2f2', color:'blue', borderRadius: 5}}
onChange={(name, checked) => this._onSelectCamada(name,item.id_camada, checked)}/>;
camadasItems.push(
<View style={{flex: 1, flexDirection: 'row'}}>
<View style={{width: "10%"}}>
{checkbox}
</View>
<View style={{width: "80%", paddingTop: 13}}>
<Text>
{item.nome_camada}
</Text>
</View>
</View>
);
}
return (
<View style={styles.container}>
<MapView
provider={this.props.provider}
ref={(ref) => {
this.mapRef = ref
}}
onLayout={() => {
}
}
initialRegion={{
latitude: LATITUDE,
longitude: LONGITUDE,
latitudeDelta: LATITUDE_DELTA,
longitudeDelta: LONGITUDE_DELTA
}}
style={styles.mapView}
>
{this.state.markers.map(marker => (
<MapView.Marker
key={marker.id}
title={marker.titulo}
coordinate={{latitude: marker.lat, longitude: marker.lng}}
description={marker.descricao}
/>
))
}
</MapView>
{this.renderIf(this.state.isPainelCamadaVisivel,
<View ref={painelSelecaoCamada => this._painelSelecaoCamada = painelSelecaoCamada}
style={styles.bgFull}>
<ScrollView style={stylesCard.scrollCard}>
<View style={stylesCard.viewCard}>
<View style={styles.borderPicker}>
<Picker
style={styles.pickerArea}
selectedValue={this.state.PickerValue}
onValueChange={(itemValue, itemIndex) => {
this.onValueChangeEscolhaArea(itemValue, itemIndex);
}
}//fim
>
{areasItems}
</Picker>
</View>
<View style={{height: 20}}>
</View>
<Button
backgroundColor="#1565C0"
onPress={() => {
this.clickBtnFecharDialogBusca();
}}
title="Ok"
buttonStyle={{width: 300, height: 50}}
></Button>
<View style={{height: 20}}>
</View>
{camadasItems}
</View>
</ScrollView>
</View>
)}
<ThemeProvider uiTheme={uiTheme}>
<View style={styles.inputView}>
<Toolbar
key="toolbar"
ref={(toolbar) => this._toolbar = toolbar}
leftElement="menu"
centerElement="Pesquise"
searchable={{
autoFocus: true,
placeholder: 'Search',
onChangeText: (text) => {
if (this.state.PickerValue == "-1") {
Alert.alert(
'Aviso',
'Selecione primeiro uma área na caixa de listagem abaixo',
[
{text: 'OK', onPress: () => console.log('OK Pressed')},
],
{cancelable: false}
);
} else {
fetch(URL + "/pequisar_area.php", {
method: 'POST',
headers: {
Accept: 'application/json',
'Content-Type': 'application/json',
},
body: JSON.stringify({
acao: "pesquisarPorTituloEDescricao",
id_area: this.state.PickerValue,
busca: text,
}),
}).then((response) => response.json())
.then((responseJson) => {
return responseJson.movies;
})
.catch((error) => {
console.error(error);
});
}
},
onSearchPressed: function () {
this.setState({
isPainelCamadaVisivel: true
});
}.bind(this),
onSearchClosed: function () {
this.setState({
isPainelCamadaVisivel: false
});
//this.handleSearchClosed.bind(this);
}.bind(this)
}}
/>
</View>
</ThemeProvider>
</View>
);
/*<LogView inverted={false} multiExpanded={true} timeStampFormat='HH:mm:ss'></LogView>*/
}
}
const styles = StyleSheet.create({
containerToolbar: {
paddingTop: 16,
},
container: {
flex: 1,
justifyContent: 'center',
backgroundColor: '#F5FCFF',
},
mapView: {
position: 'absolute',
top: 0,
left: 0,
bottom: 0,
right: 0
},
inputView: {
backgroundColor: 'white',
borderWidth: 1,
borderColor: '#CCC',
borderRadius: 3,
position: 'absolute',
top: 10,
left: 5,
right: 5
},
bgFull: {
width: '100%',
height: '100%',
position: 'absolute',
top: 0,
bottom: 0,
left: 0,
backgroundColor: '#F5FCFF',
paddingTop: 70,
alignItems: "center",
display: "none"
},
pickerArea: {
width: '100%'
},
borderPicker: {
borderWidth: 1,
borderColor: '#CCC',
borderRadius: 3,
width: '80%',
backgroundColor: "#FFF"
}
});
const stylesCard = StyleSheet.create({
MainContainer: {
flex: 1,
backgroundColor: '#F5FCFF',
justifyContent: 'center',
alignItems: 'center',
},
cardViewStyle: {
width: "100%",
height: 150,
marginLeft: 10,
marginRight: 10
},
cardView_InsideText: {
fontSize: 20,
color: '#000',
textAlign: 'center',
marginTop: 50
},
scrollCard: {
width: "100%"
},
viewCard: {
width: "100%",
alignItems: "center"
}
});
有人可以帮助我吗？