title: Ionic 2: create a single loading or toast object
body: <p>I am a newbie to Ionic 2 and Typescript, now I want to create a single loading (<a href="https://ionicframework.com/docs/components/#loading" rel="nofollow noreferrer">https://ionicframework.com/docs/components/#loading</a>) or toast object to use it everywhere. Because toast or loading object always do the same action so that I do not need to create the same thing in many place. Does anyone have an idea for me ? Thank you so much</p>