在Angular中，表单数组的验证可能会导致问题。具体来说，当我们要验证一组表单控件，比如多个checkbox或radio组成的数组时，如果其中一个控件被修改后，整个数组的验证状态都会被重新计算，这可能会导致不正确的验证结果。以下是一些解决方法。

1. 在表单数组的每个控件中添加一个单独的验证器:

import { Validators } from '@angular/forms';
 
this.myForm = this.formBuilder.group({
  checkboxes: this.formBuilder.array([
    this.formBuilder.control(false, Validators.required),
    this.formBuilder.control(false, Validators.required),
    this.formBuilder.control(false, Validators.required),
    this.formBuilder.control(false, Validators.required)
  ])
});

2. 使用自定义验证器来检查表单数组的状态:

import { Directive } from '@angular/core';
import { Validator, NG_VALIDATORS, AbstractControl, FormArray } from '@angular/forms';
 
@Directive({
  selector: '[validateCheckboxGroup]',
  providers: [{provide: NG_VALIDATORS, useExisting: CheckboxGroupValidatorDirective, multi: true}]
})
export class CheckboxGroupValidatorDirective implements Validator {
 
  validate(c: AbstractControl): {[key: string]: any} {
    if (c instanceof FormArray) {
      const controls = c.controls;
      
      // Check if all radio buttons in the array are checked
      const allChecked = controls.every(control => control.value === true);
      
      if (!allChecked) {
        return { required: true };
      }
    }
 
    return null;
  }
 
}

3. 使用rxFormBuilder来创建表单数组:

import { RxFormBuilder, FormGroup, RxFormGroup, RxFormArray } from '@rxweb/reactive-form-validators';
 
class ExampleComponent {
 
  formGroup: FormGroup;
  formArray: RxFormArray;
 
  constructor(
    private fb: RxFormBuilder
  ) { }
 
  ngOnInit() {
    this.formGroup = this.fb.formGroup({
      checkboxes: this.fb.array([
        this.fb.control(true),
        this.fb.control(false),
        this.fb.control(false),
        this.fb.control(false)
      ], {
        validator: this.validateCheckboxes
      })
    });
 
    this.formArray = this.formGroup.get('checkboxes') as RxFormArray;
  }
 
  validateCheckboxes(c: RxFormArray) {
    const allChecked = c.controls.every(control => control.value === true);
 
    return allChecked ? null : {required: true};
  }
 
}