service.ts

import {
    ComponentFactoryResolver,
    Injectable,
    ComponentRef
} from "@angular/core";
@Injectable()
export class ComponentFactoryService {
    private componentRef: ComponentRef<any>;
    constructor(private componentFactoryResolver: ComponentFactoryResolver) {}
    
    createComponent(
        componentInstance: any,
        viewContainer: any
    ): ComponentRef<any> {
        const componentFactory = this.componentFactoryResolver.resolveComponentFactory(
            componentInstance
        );
        const viewContainerRef = viewContainer.viewContainerRef;
        viewContainerRef.clear();
        this.componentRef = viewContainerRef.createComponent(componentFactory);
        return this.componentRef;
    }
    
    destroyComponent() {
        if (this.componentRef) {
            this.componentRef.destroy();
        }
    }
}