动态添加和删除angular 2自定义子组件中的formGroup

定制switch.component.html

<div class="custom-switch" [formGroup]="parentGroup">
    <input id="{{ id }}" name="status" type="checkbox"
           [checked]="checked"
           formControlName="{{ switchName }}"
           (change)="onChange($event,id)" />
    <label for="{{ id }}" class="label-default" data-toggle="tooltip" data-selector="true"
           data-title="Switch"></label>
</div>

定制switch.component.ts

import { Component,Input } from "@angular/core";
@Component({
    selector : 'custom-switch',template : 'custom-switch.component.html'
})
export class CustomSwitchComponent {
    @Input('id') id : any = 'switch';
    @Input('parentGroup') parentGroup : any;
    @Input('switchName') switchName : any;

    onChange() {
        //do something
    }
}

从父组件我调用表单子组件的组件为：

<custom-switch [parentGroup]="form" [switchName]="'switch'"></custom-switch>

我想用：

<custom-switch></custom-switch>

并删除

[formGroup] =“parentGroup”和
formControlName =“{{switchName}}”

对于非形式子组件.

我怎么能动态删除formGroup和formControlName？因为当我尝试在非表单组件上使用它时会产生错误.