好的。我可以给你我的代码。我很难找到它,但最后,一切都在 tcomb 文档中。
回答您的问题的两个要点是:“ defaultValueText ”和“ format: (date) => ... ”
import React, { Component } from "react";
import Expo from "expo";
import t from "tcomb-form-native";
import moment from 'moment';
import { StyleSheet, Text, Date} from "react-native";
import { Button } from "react-native-elements";
const Form = t.form.Form;
Form.stylesheet.dateValue.normal.borderColor = '#d0d2d3';
Form.stylesheet.dateValue.normal.backgroundColor = '#ffffff';
Form.stylesheet.dateValue.normal.borderRadius= 5,
Form.stylesheet.dateValue.normal.color = 'grey';
Form.stylesheet.dateValue.normal.borderWidth = 1;
const User = t.struct({
pseudo: t.String,
birthday: t.Date,
});
const options = {
order: ['pseudo','birthday'],
fields: {
pseudo: {
placeholder: 'Enter Name',
error: 'Name is empty?',
},
birthday: {
mode: 'date',
label: 'birthday',
config: {
defaultValueText: 'Enter birthday', // Allows you to format the PlaceHolders !!
format: (date) => {
return moment(date).format('DD-MM-YYYY'); // Allows you to format the date !!
},
}
},
},
};
……
export default class SignUp extends Component {
state = {...
render() {
return (
<View style={styles.container}>
<Form
type={User}
ref={c => (this._form = c)} // assign a ref
options={options} //set form options
/>
<Button
title="Sign Up!"
buttonStyle={styles.button}
onPress={this.handleSubmit}
/>
</View>
);
}
}
} ...