import { EventData } from '@nativescript/core/data/observable' ; import { Button } from '@nativescript/core/ui/button' ; import { TabView } from '@nativescript/core/ui/tab-view' ; let iconModes = [ 'automatic' , 'alwaysOriginal' , 'alwaysTemplate' , undefined ] ; export const onNavigate = updateButtons ; export function onChangeRenderingMode ( args ) { let tabView = ( < Button > args . object ) . page . getViewById < TabView > ( 'tab-view' ) ; tabView . iosIconRenderingMode = < 'automatic' | 'alwaysOriginal' | 'alwaysTemplate' > iconModes [ ( iconModes . indexOf ( tabView . iosIconRenderingMode ) + 1 ) % iconModes . length ] ; updateButtons ( args ) ; } function updateButtons ( args ) { let button = < Button > args . object ; let tabView = button . page . getViewById < TabView > ( 'tab-view' ) ; for ( let i = 0 , length = tabView . items . length ; i < length ; i ++ ) { ( < Button > tabView . items [ i ] . view ) . text = '' + tabView . iosIconRenderingMode ; } }