How to call Child Component Methods in Parent Component : ViewChild in Angular 2

How to call Child Component Methods in Parent Component : ViewChild

export class ParentComponent implements OnInit, DoCheck {

    @ViewChild(ChildComponent) child: ChildComponent;

SaveItems(){

this.child.ShowRecords();

}

}

export class ChildComponent implements OnInit, OnChanges {

ShowRecords() {

        this.isViewMode = true;

    }

}