how to focus on an input in Angular

 https://stackoverflow.com/questions/49927624/how-to-focus-on-an-input-in-angular

You are using ViewChildren which returns a QueryList You need to use ViewChild and your code should work.

export class MyClass {
    @ViewChild('swiper') swiper: ElementRef;

    constructor(private renderer: Renderer) {}

    onClick() {
        this.swiper.nativeElement.focus();
    }
}