在使用带有ControlValueAccessor的自定义组件时从未调用onTouched

提供 NG_VALUE_ACCESSOR ControlValueAccessor interface ,意思是你拿着 registerOnTouched(fn)

onTouched = () => void;

constructor() {
  this.form.statusChanges.pipe(
    first(() => this.form.touched),
  ).subscribe(
    () => this.onTouched()
  )
}

registerOnTouched(fn) {
  this.onTouched = fn;
}