NativeScript/tests/app/ui/list-picker/list-picker-tests-native.ios.ts

import listPickerModule = require("ui/list-picker");

export function getNativeItemsCount(listPicker: listPickerModule.ListPicker): number {
    return listPicker.ios.numberOfRowsInComponent(0);
}

export function selectNativeItem(listPicker: listPickerModule.ListPicker, index: number): void {
    listPicker.ios.selectRowInComponentAnimated(index, 0, false);
    (<UIPickerViewDelegate>(<any>listPicker)._delegate).pickerViewDidSelectRowInComponent(listPicker.ios, index, 0);
}