如何在特定条件下从angular 8中的formarray中选中复选框

<form [formGroup]="myForm">
  <div formArrayName="checkboxes">
    <div *ngFor="let checkbox of checkboxes.controls; let i = index">
      <label>
        <input type="checkbox" [formControlName]="i" [checked]="checkbox.value">
        {{ checkbox.value }}
      </label>
    </div>
  </div>
</form>

import { Component, OnInit } from '@angular/core';
import { FormBuilder, FormGroup, 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({
      checkboxes: this.formBuilder.array([
        false, // checkbox 1
        true,  // checkbox 2
        false  // checkbox 3
      ])
    });
  }
}

// 在特定条件下选中复选框
this.myForm.get('checkboxes').setValue([true, true, false]);

// 在特定条件下取消选中复选框
this.myForm.get('checkboxes').setValue([false, false, false]);