我想在包含标题选择器（Dropdown）的平面列表中创建表单。假设列表视图有3个人，将创建表单容器，每个人都有基本信息，例如姓名，姓氏和带有选择器的标题。我可以使用平面列表创建表单。我无法处理多个选择器的选定值。
这是我所做的，但没有更新我要去哪里的错误状态
const data = [
{name: 'one'},
{name: 'two'},
];
const newTitles = [];
export default class BusBookingPage extends Component {
constructor(props) {
super(props);
this.state = {
titleArray:[],
};
}
componentDidMount(){
newTitles = this.state.titleArray.slice()
for (var i = 0; i < data.length; i++) {
newTitles[i]='Mr';
}
this.setState({titleArray: newTitles})
}
onValueChange(index: string,value: number) {
var my_array = this.state.titleArray.slice()
for (var i = 0; i < data.length; i++) {
if(index==i){ my_array.splice(i, 1, value)}
}
this.setState({titleArray: my_array})
}
renderItem = ({ item, index }) => {
const itemsArray = this.state.titleArray;
var title;
if(index==0){
title = "Primary Passenger";
}else{
title = "Co-Passenger " + index;
}
return (
<View>
<Card style={styles.ContainerCardStyle}>
<View style={styles.CardContainer}>
<CardItem>
<View style={{flex:1}}>
<View style={{flexDirection: 'row',flex:1}}>
<Text style={styles.CardTitleText}>{title}</Text>
<View style={{backgroundColor: '#f2f2f2'}}>
<Text style={[styles.CardTitleText]}>Name - {item.name}</Text>
</View>
</View>
<View style={{flexDirection: 'row',flex:1, marginTop: 5,marginBottom: 1}}>
<Picker
key={index}
mode="dropdown"
iosHeader="Select your Title"
iosIcon={
<Icon
name ="arrow-drop-down-circle"
style = {{ color: "#007aff", fontSize: 25 }} />
}
style={{ width: undefined }}
selectedValue={"Miss"}
// onValueChange={(itemValue, itemIndex) => this.onClickDropdown(itemValue, itemIndex, item)}>
onValueChange={this.onValueChange.bind(this,index)}>
<Picker.Item label="Select Title" value="" />
<Picker.Item label="Mr" value="Mr" />
<Picker.Item label="Mrs" value="Mrs" />
<Picker.Item label="Miss" value="Miss" />
</Picker>
</View>
<Item
floatingLabel
style={styles.InputBoxStyle}>
<Label>First Name</Label>
<Input />
</Item>
<Item
floatingLabel
style={styles.InputBoxStyle}>
<Label>Last Name</Label>
<Input/>
</Item>
</View>
</CardItem>
</View>
</Card>
</View>
);
};
render() {
return (
<FlatList
data={data}
renderItem={this.renderItem}
keyExtractor={(item, index) => item.name}
/>
);
}
}
编辑1：我已经在selectedValue = {“ Miss”}的地方使用了这个（this.state.titleArray [index]），但没有用
答案 0 :(得分：0)
传递extraData属性并在FlatList中分配状态。然后在Picker中将状态分配给selectedValue。请检查以下代码。
const data = [
{name: 'one'},
{name: 'two'},
];
let pickers = [];
const newTitles = [];
const Titles_array = [];
export default class BusBookingPage extends Component {
constructor(props) {
super(props);
this.state = {
titleArray:[],
};
}
componentDidMount(){
newTitles = this.state.titleArray.slice() //copy the array
var newState = this.state.shareholders.slice()
var newgender = this.state.genderArray.slice()
for (var i = 0; i < data.length; i++) {
newTitles[i]='Mr';
newgender.splice(i, 1, false);
pickers.splice(i, 1, 'Mr');
newState[i]= {titles:'Select Title'};
Titles_array[i]= '';
}
this.setState({titleArray: newTitles}) //set the new state
}
handlePickerSelection(value,index){
let markers = [ ...this.state.titleArray ];
for (var j = 0; j < markers.length; j++) {
if(j===index){
markers[index] = value;
}else{
markers[j] = markers[j];
}
}
this.setState({titleArray: markers });
}
renderItem = ({ item, index }) => {
const itemsArray = this.state.titleArray;
var title;
if(index==0){
title = "Primary Passenger";
}else{
title = "Co-Passenger " + index;
}
return (
<View>
<Card style={styles.ContainerCardStyle}>
<View style={styles.CardContainer}>
<CardItem>
<View style={{flex:1}}>
<View style={{flexDirection: 'row',flex:1}}>
<Text style={styles.CardTitleText}>{title}</Text>
<View style={{backgroundColor: '#f2f2f2'}}>
<Text style={[styles.CardTitleText]}>Seat - {item.Seat}</Text>
</View>
</View>
<View style={{flexDirection: 'row',flex:1,marginTop: 5,marginBottom: 1}}>
<Picker
key={index}
iosHeader="Select your Title"
iosIcon={<Icon name="arrow-drop-down-circle" style={{ color: "#007aff", fontSize: 25 }} />}
style={{ width: undefined }}
selectedValue={this.state.titleArray[index]}
onValueChange={(v:string) => this.handlePickerSelection(v,index)}>
<Picker.Item label="Select Title" value="s" />
<Picker.Item label="Mr" value="Mr" />
<Picker.Item label="Mrs" value="Mrs" />
<Picker.Item label="Miss" value="Miss" />
</Picker>
</View>
<Item
floatingLabel
style={styles.InputBoxStyle}
>
<Label>First Name</Label>
<Input
ref={"Fname"+index}
onChangeText={(text)=> this.onChanged(text,"Fname"+index)} />
</Item>
<Item
floatingLabel
style={styles.InputBoxStyle}>
<Label>Last Name</Label>
<Input
ref={"Lname"+index}
onChangeText={(text)=> this.onChanged(text,"Lname"+index)}
/>
</Item>
</View>
</CardItem>
<CardItem>
</CardItem>
</View>
</Card>
</View>
);
};
render() {
return (
<Container style={{backgroundColor: '#EEEEEE',}}>
<Content>
<FlatList
extraData={this.state.titleArray}
data={data}
renderItem={this.renderItem}
keyExtractor={(item, index) => item.Seat}
/>
</Content>
</Container>
);
}
}