Ionic -angular failed to update view after click on a button

Why after click in a button in the ion-alert component, the view don't get update ? For example if i have a property in my component called sending and a handler for a button of my ion-alert :

// in my component
public sending = false;

constructor(
public alertCtrl: AlertController,
) { }

async deleteFile() {
const alert = await this.alertCtrl.create({
header: 'Deseas eliminar el archivo?',
message: '',
buttons: [
{
text: 'Eliminar',
role: 'eliminar',
cssClass: 'btn-alert',
handler: () => {
this.sending = true;
}
}
]
});

await alert.present();
}

<!-- in my view -->
<div> {{ sending }} </div>


The view don't update unless i call the angular method ** markForCheck () ** inside the handler.

I am using ionic 4 and angular.

English isn’t my first language, so please excuse any mistakes

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