A helper to add an application to a users login items

LoginHelper.swift

//
//  LoginHelper.swift
//  SquidBar
//
//  Created by Robert Burns on 2/11/16.
//  Copyright © 2016 Robert Burns. All rights reserved.
//

import Foundation

func applicationIsInStartUpItems() -> Bool {
    return itemReferencesInLoginItems().existingReference != nil
}

func setLaunchAtStartup(launchOnStartup: Bool) {

    let itemReferences = itemReferencesInLoginItems()
    let isNotAlreadySet = (itemReferences.existingReference == nil)
    let loginItemsRef = LSSharedFileListCreate(nil, kLSSharedFileListSessionLoginItems.takeRetainedValue(), nil).takeRetainedValue() as LSSharedFileListRef?

    if loginItemsRef != nil {
        if isNotAlreadySet && launchOnStartup {
            if let appUrl: CFURLRef = NSURL.fileURLWithPath(NSBundle.mainBundle().bundlePath) {
                LSSharedFileListInsertItemURL(loginItemsRef, itemReferences.lastReference, nil, nil, appUrl, nil, nil)
            }
        } else if !isNotAlreadySet && !launchOnStartup {
            if let itemRef = itemReferences.existingReference {
                LSSharedFileListItemRemove(loginItemsRef,itemRef);
            }
        }
    }
}

func itemReferencesInLoginItems() -> (existingReference: LSSharedFileListItemRef?, lastReference: LSSharedFileListItemRef?) {

    if let appUrl : NSURL = NSURL.fileURLWithPath(NSBundle.mainBundle().bundlePath) {
        let loginItemsRef = LSSharedFileListCreate(nil, kLSSharedFileListSessionLoginItems.takeRetainedValue(), nil).takeRetainedValue() as LSSharedFileListRef?
        if loginItemsRef != nil {
            let loginItems: NSArray = LSSharedFileListCopySnapshot(loginItemsRef, nil).takeRetainedValue() as NSArray
            if(loginItems.count > 0)
            {
                let lastItemRef: LSSharedFileListItemRef = loginItems.lastObject as! LSSharedFileListItemRef
                for var i = 0; i < loginItems.count; ++i {
                    let currentItemRef: LSSharedFileListItemRef = loginItems.objectAtIndex(i) as! LSSharedFileListItemRef
                    if let itemURL = LSSharedFileListItemCopyResolvedURL(currentItemRef, 0, nil) {
                        if (itemURL.takeRetainedValue() as NSURL).isEqual(appUrl) {
                            return (currentItemRef, lastItemRef)
                        }
                    }
                }
                return (nil, lastItemRef)
            } else {
                let addatstart: LSSharedFileListItemRef = kLSSharedFileListItemBeforeFirst.takeRetainedValue()
                return(nil,addatstart)
            }
        }
    }

    return (nil, nil)
}