Swift protocols and protocol extensions to easily add and delete conforming instances to Spotlight. Blog post can be found here: http://silvandaehn.com/2015/09/25/Simplifying-CoreSpotlight/

Searchable.swift

import UIKit
import CoreSpotlight
import MobileCoreServices

public typealias Completion = NSError? -> Void

// MARK: - Searchable Protocol

public protocol Searchable {
    static var spotlightDomainIdentifier: String { get }
    var spotlightIdentifier: String { get }
    var spotlightTitle: String { get }
    var spotlightDescription: String? { get }
    var spotlightImage: UIImage? { get }
    var spotlightKeywords: [String]? { get }
}

public extension Searchable {

    var spotlightImage: UIImage? { return nil }
    var spotlightKeywords: [String]? { return nil }

    var searchableItem: CSSearchableItem {
        let attributeSet = CSSearchableItemAttributeSet(itemContentType: kUTTypeText as String)
        attributeSet.title = spotlightTitle
        attributeSet.contentDescription = spotlightDescription
        attributeSet.keywords = spotlightKeywords
        let item = CSSearchableItem(
            uniqueIdentifier: spotlightIdentifier,
            domainIdentifier: self.dynamicType.spotlightDomainIdentifier,
            attributeSet: attributeSet
        )
        item.expirationDate = .distantFuture()
        item.attributeSet.thumbnailData = spotlightImage.flatMap(UIImagePNGRepresentation)
        return item
    }

    func addToSpotlightIndex(
        index: CSSearchableIndex = .defaultSearchableIndex(),
        completion: Completion? = nil) {
            index.indexSearchableItems([searchableItem], completionHandler: completion)
    }

    func removeFromSpotlightIndex(
        index: CSSearchableIndex = .defaultSearchableIndex(),
        completion: Completion? = nil) {
            index.deleteSearchableItemsWithIdentifiers([spotlightIdentifier], completionHandler: completion)
    }

    static func deleteAllIndiciesFromSpotlightIndex(
        index: CSSearchableIndex = .defaultSearchableIndex(),
        completion: Completion? = nil) {
            index.deleteSearchableItemsWithDomainIdentifiers([self.spotlightDomainIdentifier], completionHandler: completion)
    }
}

extension SequenceType where Generator.Element == Searchable {
    func addToSpotlightIndex(
        index: CSSearchableIndex = .defaultSearchableIndex(),
        completion: Completion? = nil) {
            index.indexSearchableItems(self.map { $0.searchableItem }, completionHandler: completion)
    }

    func removeFromSpotlightIndex(
        index: CSSearchableIndex = .defaultSearchableIndex(),
        completion: Completion? = nil) {
            index.deleteSearchableItemsWithIdentifiers(self.map { $0.spotlightIdentifier }, completionHandler: completion)
    }
}

Thx @daehn, you just saved me hours of work ! 👍

nice code! have you considered making it a Cocoapod?