在formgroup上设置验证器

我看了多个问题,所有的答案都是为了在表单组上设置验证器。我知道如何使用如下所示的表单生成器进行此操作。

 this.userForm = this.fb.group({
  id: '',
  firstName: ['', [Validators.required]],
  lastName: ['', [Validators.required]],
  email: ['', [Validators.required]],
  phoneNumber: ['', [Validators.required]],
  jobTitle: ['', [Validators.required]],
  team: ['', [Validators.required]],
  passwords: this.fb.group({
    password: '',
    confirmPassword: ''
  },{
    validator: Validators.compose([PasswordValidators.MatchPassword, PasswordValidators.PasswordRequirements])
  }),
  userValues: this.fb.array([])
});

现在我的组件有两种模式,添加和编辑。如果模式为add,则密码控件应使用所需的验证器。我检查模式,如果它不在编辑模式,我想更新密码表单组上的验证器,以包含所需的验证器。我已经在ngInit事件中尝试了这一点,如下所示。

 // if not edit mode then the password fields are required, so we overwrite the default validators.
if(!this.isEditMode)
{
  console.log("user form mode: " + this.isEditMode)
  const passwordForm = <FormGroup>this.userForm.controls['passwords'];

   // try to set the validators on the form group as a whole.
  passwordForm.setValidators([PasswordValidators.MatchPassword, PasswordValidators.PasswordRequirements, Validators.required]);
  // try to set the password on the individual control.
  passwordForm.controls['password'].setValidators([PasswordValidators.MatchPassword, PasswordValidators.PasswordRequirements, Validators.required]);

}

现在,我第一次尝试在一段时间内更新表单组中的验证器并没有什么不同。第二次尝试更新单个表单控件时,我的验证器会引发异常。因此,我是否可以将其应用于表单组,而不必更改验证器的工作方式。下面可以看到验证器。

import { AbstractControl, ValidatorFn } from '@angular/forms';

export class PasswordValidators {

    static MatchPassword(AC: AbstractControl){
        let password = AC.get('password').value; // to get value in input tag
        let confirmPassword = AC.get('confirmPassword').value; // to get value in input tag

         if(!password || password == "")
         {
             return null;
         }

         if(password != confirmPassword) {
             AC.get('confirmPassword').setErrors( {MatchPassword: true} );
         } else {
             return null;
         }
    }

    // Ensures the password meets the minimum standard. Password should be at least 8 char, contain one numeric, one character, and one special character.
    static PasswordRequirements(AC: AbstractControl) {
        let password = AC.get('password').value;

        if(!password || password == "")
        {
            return null;
        }

        if(password != password.match("^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9])(?=.*?[#?!@$%^&*-]).{8,}$")) {
            AC.get('password').setErrors({PasswordRequirements: true})
        } else {
            return null;
        }

    }
}

任何关于我如何实现这一目标的建议都将非常好。干杯