if-platform-directives.ts

import {Directive, ViewContainerRef, TemplateRef, Inject} from '@angular/core';
import {Device, platformNames} from "platform";
import {DEVICE} from "nativescript-angular/platform-providers";

@Directive({ selector: "[ifAndroid]" })
export class IfAndroidDirective {
    constructor( @Inject(DEVICE) device: Device, container: ViewContainerRef, templateRef: TemplateRef<Object>) {
        if (device.os === platformNames.android) {
            container.createEmbeddedView(templateRef);
        }
    }
}

@Directive({ selector: "[ifIos]" })
export class IfIosDirective {
    constructor( @Inject(DEVICE) device: Device, container: ViewContainerRef, templateRef: TemplateRef<Object>) {
        if (device.os === platformNames.ios) {
            container.createEmbeddedView(templateRef);
        }
    }
}

usage.html

 <ActionBar title="test">
	<ActionItem text="android" *ifAndroid></ActionItem>          
	<ActionItem text="ios" *ifIos></ActionItem>     
 </ActionBar>

Still doesn't render any icons however.