Launch your app when you login

gistfile1.swift

import Cocoa

class LaunchStarter: NSObject {

    class func toggleLaunchAtStartup() {
        let itemReferences = itemReferencesInLoginItems()
        let shouldBeToggled = (itemReferences.existingReference == nil)
        if let loginItemsRef = LSSharedFileListCreate( nil, kLSSharedFileListSessionLoginItems.takeRetainedValue(), nil).takeRetainedValue() as LSSharedFileListRef? {
            if shouldBeToggled {
                if let appUrl : CFURLRef = NSURL.fileURLWithPath(NSBundle.mainBundle().bundlePath) {
                    LSSharedFileListInsertItemURL(loginItemsRef, itemReferences.lastReference, nil, nil, appUrl, nil, nil)
                }
            } else {
                if let itemRef = itemReferences.existingReference {
                    LSSharedFileListItemRemove(loginItemsRef,itemRef);
                }
            }
        }
    }

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

    class func itemReferencesInLoginItems() -> (existingReference: LSSharedFileListItemRef?, lastReference: LSSharedFileListItemRef?) {
        if let appURL : NSURL = NSURL.fileURLWithPath(NSBundle.mainBundle().bundlePath) {
            if let loginItemsRef = LSSharedFileListCreate(nil, kLSSharedFileListSessionLoginItems.takeRetainedValue(), nil).takeRetainedValue() as LSSharedFileListRef? {

                let loginItems: NSArray = LSSharedFileListCopySnapshot(loginItemsRef, nil).takeRetainedValue() as NSArray
                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)
            }
        }
        
        return (nil, nil)
    }
}