关于reactjs：FAB在React Native中不起作用

FAB not working in React Native

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import React, { Component } from 'react';
import { Container, Header, View, Button, Icon, Fab } from 'native-base';
export default class FABExample extends Component {
constructor() {
this.state = {
active: 'true'
};
}
render() {
return (
<Container>
<Header />
<View style={{ flex: 1 }}>
<Fab
active={this.state.active}
direction="up"
containerStyle={{ }}
style={{ backgroundColor: '#5067FF' }}
position="bottomRight"
onPress={() => this.setState({ active: !this.state.active })}>
<Icon name="share" />
<Button style={{ backgroundColor: '#34A34F' }}>
<Icon name="logo-whatsapp" />
</Button>
<Button style={{ backgroundColor: '#3B5998' }}>
<Icon name="logo-facebook" />
</Button>
<Button disabled style={{ backgroundColor: '#DD5144' }}>
<Icon name="mail" />
</Button>
</Fab>
</View>
</Container>
);
}
}

我正在使用上面的代码，以便在我的项目中添加FAB。但是我遇到一个错误：

Body:{"type":"TransformError","snippet":" 3| constructor() {
4| this.state ......