angular的formGroup的校验触发

angular material 中form表单提交时赋值，无法触发input输入框的样式

onSubmit() {
    Object.values(this.formGroup.controls).forEach(i=>{
      i.marksAsDirty();
    })
    this.formGroup.patchValue(this.formGroup.getRowValue())
    if(this.formGroup.invalid){
      return;
    }
  }

// 需要在app.module.ts 中添加
import { errorStateMatcher, showOnDirtyErrorStateMatcher } from '@angular/material'
providers: [
    { provide: errorStateMatcher, useClass: showOnDirtyErrorStateMatcher }
  ],