Angle mask directive 2 does not put the mask on when the screen starts

Hello, I made a directive in Angular 2 to put masks in some fields, one of them the zip code. It works fine, the only thing I could not do is still that when loading the data in the fields of the screen the value is with the mask, it only works when the focus is in the field that has the directive.

I have tried to put several events on the host, but none worked, I already tried to use change , input , but none worked.

Below is the code HTML with the input that has the directive, the policy name is zip:

<div class="col-sm-4">
    <div class="form-group fg-line">
        <label for="cep">CEP</label>
        <input type="text" class="form-control input-sm" id="cep" placeholder="CEP" required [(ngModel)]="empresa.Cep" borda-animada
            cep maxlength="9" ngControl="cep" #cep="ngForm">
    </div>
</div>

Now below the policy code:

import {Directive} from '@angular/core';
import {NgModel} from '@angular/common';
import {Mascaras} from '../core/mascaras'

@Directive({
    selector: '[ngModel][cep]',
    providers: [NgModel],
    host: {
        '(blur)': 'onInputChange($event)',
        '(input)': 'onInputChange($event)'
    }
})
export class CepDirective {
    modelValue: string;
    viewValue: string;

constructor(public model: NgModel) {
}

onInputChange(event) {
    console.log('teste ngmodelchange');

    //event é o evento html que é disparado no evento blur
    //por isso precisa pegar o target.value.
    var newValue = Mascaras.cep(event.target.value);
    this.model.valueAccessor.writeValue(newValue);       
}
}