뒤로가기 버튼 차단

앱의 비밀번호 입력 페이지등을 만들다 보면

뒤로가기 버튼을 막아야 하는 경우가 있다.

이 경우 platform에서 제공하는 뒤로가기 버튼 Action을 
재정의하여 차단한다.

 // Property used to store the callback of the event handler to unsubscribe to it when leaving this page
    public unregisterBackButtonAction: any;
 
    constructor(...) { ... }
 
    ionViewDidEnter() {
        this.initializeBackButtonCustomHandler();
    }
 
    ionViewWillLeave() {
        // Unregister the custom back button action for this page
        this.unregisterBackButtonAction && this.unregisterBackButtonAction();
    }
 
    public initializeBackButtonCustomHandler(): void {
        this.unregisterBackButtonAction = this.platform.registerBackButtonAction(() => {
            this.customHandleBackButton();
        }, 10);
    }
 
    private customHandleBackButton(): void {
        // do what you need to do here ...
    }    // Property used to store the callback of the event handler to unsubscribe to it when leaving this page
    public unregisterBackButtonAction: any;
 
    constructor(...) { ... }
 
    ionViewDidEnter() {
        this.initializeBackButtonCustomHandler();
    }
 
    ionViewWillLeave() {
        // Unregister the custom back button action for this page
        this.unregisterBackButtonAction && this.unregisterBackButtonAction();
    }
 
    public initializeBackButtonCustomHandler(): void {
        this.unregisterBackButtonAction = this.platform.registerBackButtonAction(() => {
            this.customHandleBackButton();
        }, 10);
    }
 
    private customHandleBackButton(): void {
        // 뒤로가기 버튼 Action 재 정의
    }