API

校验和应用

const errors = control.errors;
const hasError = control.hasError('isNameExist')
this.form.setErrors({ invalid: true });
this.optionCategorySettingForm.get('categoryIds').setValidators(Validators.required);
this.optionCategorySettingForm.get('categoryIds').clearValidators();

设置表单值

 this.form.setValue({first: 'Carson', last: 'Drew'});