Custom component in ionic v3

Question

I wanted to create a simple component and include it on a page. I created it with ionic g component my-header (ionic-cli v3 beta), fixed the IonicPageModule bug and then added to another page. I then get this error:

Error: Uncaught (in promise): Error: Template parse errors:
'my-header' is not a known element:
1. If 'my-header' is an Angular component, then verify that it is part of this module.
2. If 'my-header' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.

The "MyHeaderComponent" was added to the @NgModule declarations automatically.

Thanks for your help.

EDIT:

The component is located inside my components folder:

components/my-header/my-header.html

<div>
  {{text}}
</div>

components/my-header/my-header.module.ts

import { NgModule } from '@angular/core';
import { IonicModule } from 'ionic-angular';
import { MyHeaderComponent } from './my-header';

@NgModule({
  declarations: [
    MyHeaderComponent,
   ],
  imports: [
    IonicModule,
  ],
  exports: [
    MyHeaderComponent
  ],
  entryComponents:[
    MyHeaderComponent
  ]
})
export class MyHeaderComponentModule {}

components/my-header/my-header.scss

my-header {}

components/my-header/my-header.ts

import { Component } from '@angular/core';

@Component({
  selector: 'my-header',
  templateUrl: 'my-header.html'
})
export class MyHeaderComponent {

  text: string;

  constructor() {
    console.log('Hello MyHeaderComponent Component');
     this.text = 'Hello World';
  }

}

app/app.module.ts

/* imports */
import { MyHeaderComponent } from '../components/my-header/my-header';

@NgModule({
  declarations: [
    MyApp,
    MyHeaderComponent
  ],
...

pages/home/home.html

Answer 1

Since ionic 3 supports lazy-loading, you need not import your custom component in the app. module.ts file. Instead you can import it in specific page's module.ts file. For eg: If you want to use your custom component in your homepage you can just import it in your home.module.ts file as given below:

import { NgModule } from '@angular/core';
import { IonicPageModule } from 'ionic-angular';
import { HomePage } from './home';
import { MyHeaderComponent }from '../../components/myheader/myheader';

@NgModule({
  declarations: [
    HomePage,
    MyHeaderComponent
  ],
  imports: [
    IonicPageModule.forChild(HomePage),
   
  ],
  exports: [
    HomePage,
  ]
})
export class HomePageModule {
 
}

However don't forget to remove your import and declarations from app.module.ts file which is added automatically when you create your custom component.