Angular2：等待服务初始化

ngIf似乎没有削减它(组件加载,即使如果不匹配).

我没有使用路由器(不需要它用于应用程序),所以我不认为@CanActivate在这种情况下是合适的.

有任何想法吗？

@Component({
    selector: 'my-app',directives: [MyDirective],template: `
    <div>
        <div *ngIf="!initialized">Loading...</div>
        <div *ngIf="initialized"><myDirective>should wait for service to be initialized</myDirective></div>
    </div>`
})
export class AppComponent {
    initialized = false;

    constructor(_myService: MyService) {
        this._myService = _myService;
    }

    ngOnInit() {
        this._myService.init()
            .then(() => {
                setTimeout( () => this.initialized = true,2000);
            }
        );
    }
}