back button ionic code example

Example 1: back button ionic

<ion-header>
  <ion-toolbar>
    <ion-buttons slot="start">
      <ion-back-button></ion-back-button>
    </ion-buttons>
  </ion-toolbar>
</ion-header>

Example 2: ionic how to block back button

this.platform.backButton.subscribe(() => {
  // do something here
});

Example 3: back button ionic

Here i add full source code to set this android hardware back button issue.
https://bootstraphelpcenter.blogspot.com/2021/05/ionic-5-angular-10-hardware-back-button.html