angular表单 如何往formArray中动态添加formGroup

angular form表单，需要动态添加一列，这一列中有多个control，这里需要用到formArray。这一列可以当作formGroup。相关代码如下：

一、创建一个formArray

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this.validateForm = this.fb.group({
    categoryList: this.fb.array([])
});
get categoryList(){
    return this.validateForm.get('categoryList') as FormArray
}

二、往formArray中添加 formGroup

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this.categoryList.push(this.fb.group({
    id: this.fb.control(v.id),
    name: this.fb.control(v.name)
}))

三、html中的代码

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<div [formGroup] = "validateForm">
    <div formArrayName="categoryList">
        <div *ngFor="let item of categoryList.controls; let i=index">
            <div [formGroupName]="i">
                <input type="hidden" formControlName="id">
                <input nz-input formControlName="name"/>
            </div>
         </div>
    </div>
</div>

四、删除

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this.categoryList.removeAt(i)

五、表单是否修改过

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this.validateForm.dirty

保存之后，dirty修改为false

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this.validateForm.markAsPristine()