ionic 4 ionViewWillEnter code example
Example 1: ionviewwillenter
ionViewWillEnter Fired when the component routing to is about to animate into view.
ionViewDidEnter Fired when the component routing to has finished animating.
ionViewWillLeave Fired when the component routing from is about to animate.
ionViewDidLeave Fired when the component routing to has finished animating.
Example 2: ionviewwillenter in ionic 5
ngAfterViewInit()