examples of ionic life cycle methods

Example: ionic lifecycle

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.