在网页ionic 2中使用app.component函数

Question

I am trying to use app.component.ts function in a page, but getting error .

EXCEPTION: Uncaught (in promise): TypeError: undefined is not an object (evaluating 'e.pages.updatePages')

Function in app.component.ts :

updatePages(pages){
   console.log(pages);
 }

Code in page.ts

this.sidebarpage = [{ title: 'My Account', component: MyAccountPage }];
this.pages.updatePages(this.sidebarpage);

Already imported component in page.ts and added @ViewChild(MyApp) pages: MyApp;

Answer 1

app.component.ts is not a child page. ViewChild decorator is used when you are accessing a child component set in your corresponding html page and there is generally no need to use root tags in other pages.

You should create a provider class for this. Set the function in the provider and set the class in providers array app.module.ts to use in your components. More here