问题描述
我是新来的本地人,我想创建一个表格。我为此使用formik。我还添加了react-native-dropdown-picker,因为react-native的选择器在android上的占位符有问题。我想将我在下拉菜单中使用的性别属性传递给该州。我有什么办法吗?
import React,{Component} from 'react'
import { StyleSheet,Button,TextInput,View,} from 'react-native'
import { Formik } from 'formik';
import DropDownPicker from 'react-native-dropdown-picker';
export default class Registration extends Component{
render() {
return (
<View>
<Formik
initialValues={{ fullName: '',mobileNumber: '',country: '',gender: '',password: '',email: '' }}
onSubmit={(values) => {
console.log(values)
}}
>
{(props) => (
<View>
<TextInput style={styles.input}
placeholder="Full Name"
onChangeText={props.handleChange('fullName')}
value={props.values.fullName}
>
</TextInput>
<TextInput style={styles.input}
placeholder="Mobile Number"
keyboardType="numeric"
onChangeText={props.handleChange('mobileNumber')}
value={props.values.mobileNumber}
>
</TextInput>
<TextInput style={styles.input}
placeholder="Country"
onChangeText={props.handleChange('country')}
value={props.values.country}
>
</TextInput>
<DropDownPicker
items={[
{label: 'Male',value: 'male'},{label: 'Female',value: 'female'},]}
defaultValue={props.values.gender}
placeholder="Select your gender"
containerStyle={{height: 40}}
style={{backgroundColor: '#fafafa'}}
itemStyle={{
justifyContent: 'flex-start'
}}
dropDownStyle={{backgroundColor: '#fafafa'}}
onChangeItem={item => props.setState({
gender: item.value
})}
/>
<TextInput style={styles.input}
placeholder="Email"
onChangeText={props.handleChange('email')}
value={props.values.email}
>
</TextInput>
<TextInput style={styles.input}
placeholder="Password"
secureTextEntry={true}
onChangeText={props.handleChange('password')}
value={props.values.password}
>
</TextInput>
<Button title="Submit" color="blue" onPress={props.handleSubmit}></Button>
</View>
)}
</Formik>
</View>
)
}
}
const styles = StyleSheet.create({
input: {
borderWidth: 1,borderColor: "#ddd",padding: 10,fontSize: 18,borderRadius: 6
}
})
解决方法
我找到了答案。 formik有一个称为set field value的方法,可以更新下拉菜单的状态
<DropDownPicker
items={[
{ label: 'Male',value: 'male' },{ label: 'Female',value: 'female' },]}
value={props.values.gender}
placeholder="Select your gender"
containerStyle={{ height: 40 }}
onBlur={props.handleBlur('gender')}
style={{ backgroundColor: '#fafafa' }}
itemStyle={{
justifyContent: 'flex-start'
}}
dropDownStyle={{ backgroundColor: '#fafafa' }}
onChangeItem={item => props.setFieldValue(
'gender',item.value
)}
/>