在Angular2中，有没有一种方法可以在创建控件(或formControlName)之后将其添加到formGroup？

import { Component, OnInit } from '@angular/core';
import { FormGroup, FormControl } from '@angular/forms';

@Component({
  selector: 'app-example',
  template: `
    <form [formGroup]="myForm">
      <input formControlName="myControl">
    </form>
  `
})
export class ExampleComponent implements OnInit {
  myForm: FormGroup;

  ngOnInit() {
    this.myForm = new FormGroup({});
    this.addControlToForm('myControl');
  }

  addControlToForm(controlName: string) {
    const control = new FormControl();
    this.myForm.addControl(controlName, control);
  }
}