Ionic checkbox not auto checked

Question

first I have checkbox code like this, and the checkbox can auto checked

<ion-checkbox color="dark" checked="true">

but after I add the ngModel, why the checkbox cannot auto checked?

<ion-checkbox color="dark" checked="true" [(ngModel)]="data.remember">

Answer 1

<ion-checkbox color="dark" checked="true" [(ngModel)]="data.remember">

just assign your ngModel variable to true

this.data.remember = true;