React Native状态更改未重新呈现

Question

我正在尝试为React Native的天才聊天提供状态条件页脚。我在结构上创建了“ userReply”布尔变量状态，然后将自定义视图附加到了Gifted-Chat页脚视图，如下所示；

    constructor(props) {
    super(props);
    this.onLongPress = this.onLongPress.bind(this);
    this.renderFooterReply = this.renderFooterReply.bind(this);
    this.state = {
        messages: [],
        userReply: false
    };
}

这里是我长按该项目时如何更新状态； <​​/ p>

 onLongPress(ctx, currentMessage) {

    this.state.currentMessage = currentMessage;
    const options = [
        'Reply',
        'Copy Text',
        'Cancel',
    ];
    const cancelButtonIndex = options.length - 1;
    ctx.actionSheet().showActionSheetWithOptions({
            options,
            cancelButtonIndex,
        },
        (buttonIndex) => {
            switch (buttonIndex) {
                case 0:
                    this.setState({userReply: true});
                    break;
                case 1:
                    Clipboard.setString(currentMessage.text);
                    break;
            }
        });
}

当我单击“回复”按钮后，应呈现此视图；

 renderFooterReply() {
    alert(this.state.userReply);
    if (this.state.userReply) {
        return (

            <View style={{height: 50, flexDirection: 'row'}}>
               ...
            </View>
        );
    }
    return null;
}

最后，我如何将自定义视图设置为有才华的聊天页脚；

render() {
    return (
        <GiftedChat
            messages={this.state.messages}
            onSend={messages => this.onSend(messages)}
            onLongPress={(ctx, currentMessage) => this.onLongPress(ctx, currentMessage)}
            renderFooter={this.renderFooterReply}
            user={{
                _id: 1,
            }}
        />
    )
}

但是，当“ userReply”状态更改时，页脚不会重新呈现。谢谢。