Switch

<Switch checked="true" (checkedChange)="onCheckedChange($event)"> </Switch>

import { Component } from '@angular/core'
import { EventData, Switch } from '@nativescript/core'

@Component({
  moduleId: module.id,
  templateUrl: './usage.component.html'
})
export class BasicSwitchComponent {
  onCheckedChange(args: EventData) {
    const sw = args.object as Switch
    const isChecked = sw.checked // boolean
  }
}

<Switch checked="true" loaded="onSwitchLoaded" />

import { Switch } from '@nativescript/core'

export function onSwitchLoaded(argsloaded) {
  const mySwitch = argsloaded.object as Switch
  mySwitch.on('checkedChange', args => {
    const sw = args.object as Switch
    const isChecked = sw.checked
    console.log(`Switch new value ${isChecked}`)
  })
}