我正在尝试此组件 react-native-calendar

它总是给出错误 null is not an object (evaluating this.state.date)

我尝试初始化名为 state 的状态变量并为其分配日期值，但错误仍然存​​在。

var Calendar = require('react-native-calendar-component');

export default class proj extends Component {

constructor(props) {
super(props);
this.state = {
date: new Date()
};
}

render() {
return (
<Calendar
date={this.state.date}
onPrevButtonPress={() => this.handlePrevButtonPress()}
onNextButtonPress={() => this.handleNextButtonPress()}
onDateSelect={(date) => this.handleDateSelect(date)} />
);
}
}