如何在angular 8中的formarray中应用验证

<form [formGroup]="myForm">
  <div formArrayName="myArray">
    <div *ngFor="let control of myForm.get('myArray').controls; let i = index">
      <input type="text" [formControlName]="i">
    </div>
  </div>
</form>

import { Component, OnInit } from '@angular/core';
import { FormGroup, FormBuilder, Validators, FormArray } from '@angular/forms';

@Component({
  selector: 'app-my-component',
  templateUrl: './my-component.component.html',
  styleUrls: ['./my-component.component.css']
})
export class MyComponentComponent implements OnInit {
  myForm: FormGroup;

  constructor(private formBuilder: FormBuilder) { }

  ngOnInit() {
    this.myForm = this.formBuilder.group({
      myArray: this.formBuilder.array([
        this.formBuilder.control('', Validators.required),
        this.formBuilder.control('', Validators.minLength(5))
      ])
    });
  }
}

<button (click)="submitForm()">Submit</button>

submitForm() {
  if (this.myForm.valid) {
    // 表单验证通过，执行相应的操作
  } else {
    // 表单验证不通过，执行相应的操作
  }
}