Close Modal in Ionic 4 by Back Button

Question

I have a Modal in Ionic 4. I\'d like to close it, when a user press the back button on her mobile (or the bac

Answer 1

Enol's answer helped me find a solution, thanks for that.

platform.registerBackButtonAction does no longer exist in v4. I tried platform.backButton.subscribe instead, but it didn't work. What works is this:

private backbuttonSubscription: Subscription;

constructor(private modalCtrl: ModalController) {

ngOnInit() {
    const event = fromEvent(document, 'backbutton');
    this.backbuttonSubscription = event.subscribe(async () => {
        const modal = await this.modalCtrl.getTop();
        if (modal) {
            modal.dismiss();
        }
    });
}

ngOnDestroy() {
    this.backbuttonSubscription.unsubscribe();
}