使用自定义组件更改formControl的值

import { Component, forwardRef } from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';

@Component({
  selector: 'app-custom-input',
  template: `
    <input type="text" [(ngModel)]="value" (input)="onChange($event.target.value)">
  `,
  providers: [
    {
      provide: NG_VALUE_ACCESSOR,
      useExisting: forwardRef(() => CustomInputComponent),
      multi: true
    }
  ]
})
export class CustomInputComponent implements ControlValueAccessor {
  value: string;
  onChange: (value: string) => void;

  writeValue(value: string): void {
    this.value = value;
  }

  registerOnChange(fn: (value: string) => void): void {
    this.onChange = fn;
  }

  registerOnTouched(): void {}

  setDisabledState(isDisabled: boolean): void {}
}