How to use Loading component

Hi everybody!
I got a problem.
I have one component - page with component. And some components on it. I want to show loading alert on page start. And after all component are loaded hide my alert. How to do this? Do you have any work examples? I read component manual http://ionicframework.com/docs/v2/components/#loading

But I have no idea how to use it my situation.
Please help me.