car/assets/script/ui/ui_parent.ts

import { _decorator, BlockInputEvents, Component, Node } from 'cc';
const { ccclass, property } = _decorator;

@ccclass('ui_parent')
export class ui_parent extends Component {
    private is_bolck:boolean = false
    update(deltaTime: number) {
        if(this.node.children.length<=0&&this.is_bolck){
            this.is_bolck = false
            this.getComponent(BlockInputEvents).enabled = false
        }

        if(this.node.children.length>0&&!this.is_bolck){
            this.is_bolck = true
            this.getComponent(BlockInputEvents).enabled = true
        }
    }
}