Searchbar Ionic 2

I was able to implement searchbar as IONIC 2 documentation.

The problem is that I am bringing information from a remote database and I can not implement this database data in searchbar . It's a matter of passing the variable array to within the initializeItems() function, but I can not.

I have tried to put initializeItems(){this.item[]} , but then the value is null, below the codes I have:

TYPESCRIPT

export class ListaPage {
  items:any[];
  searchQuery: string = '';
  constructor(public navCtrl: NavController, public service:ServiceProvider) {
    this.getDados();
    this.navCtrl=navCtrl;
    this.initializeItems();
  }
  getDados(){
    this.service.getData().subscribe(
      data =>this.items=data,
      err =>console.log(err)
    );
  }
  chamaProd(pr){
    this.navCtrl.push(ProdutoPage, {id: pr});
  }
  initializeItems() {
    this.items = ['aqui','que','quero','chamar','os dados','do banco'];
  }
  getItems(ev: any) {  
     this.initializeItems();
     let val = ev.target.value;
     if (val && val.trim() != '') {
       this.items = this.items.filter((item) => {
         return (item.toLowerCase().indexOf(val.toLowerCase()) > -1);
       })
     }
   }
}

HTML

<ion-searchbar (ionInput)="getItems($event)"></ion-searchbar>
  <ion-item-sliding *ngFor="let item of items">
    <div  *ngFor="let item of items">
       {{item.nome}}
</div>