转到MatStepper中的下一步后聚焦输入

<mat-horizontal-stepper #stepper>
  <mat-step>
    <form>
      <mat-form-field>
        <input matInput #input1 placeholder="输入1">
      </mat-form-field>
      <button mat-button matStepperNext>下一步</button>
    </form>
  </mat-step>
  <mat-step>
    <form>
      <mat-form-field>
        <input matInput #input2 placeholder="输入2">
      </mat-form-field>
      <button mat-button matStepperPrevious>上一步</button>
      <button mat-button matStepperNext>下一步</button>
    </form>
  </mat-step>
</mat-horizontal-stepper>

import { Component, ViewChild, AfterViewInit } from '@angular/core';
import { MatStepper } from '@angular/material/stepper';

@Component({
  selector: 'app-stepper',
  templateUrl: './stepper.component.html',
  styleUrls: ['./stepper.component.css']
})
export class StepperComponent implements AfterViewInit {
  @ViewChild('stepper') stepper: MatStepper;
  @ViewChild('input2') input2;

  ngAfterViewInit() {
    this.stepper.selectionChange.subscribe((event) => {
      if (event.selectedIndex === 1) {
        setTimeout(() => {
          this.input2.nativeElement.focus();
        }, 0);
      }
    });
  }
}