SwiftでAppleScriptを使う方法

AppleScriptの返り値がStringの場合

import Cocoa
let appleScript = "tell application \"iTunes\"\n"
	+ "set trackName to name of current track\n"
	+ "return trackName\n"
	+ "end tell"
var error: NSDictionary?
if let scriptObject = NSAppleScript(source: appleScript) {
	if let output: NSAppleEventDescriptor = scriptObject.executeAndReturnError(&error) {
		print(output.stringValue) // Optional("TrackName")
	}
	if error != nil {
		print(error)
	}
}

AppleScriptの返り値がListの場合

import Cocoa
let appleScript = "tell application \"iTunes\"\n"
	+ "set trackName to name of current track\n"
	+ "set trackArtist to artist of current track\n"
	+ "return {trackName,trackArtist}\n"
	+ "end tell"
var error: NSDictionary?
if let scriptObject = NSAppleScript(source: appleScript) {
	if let output: NSAppleEventDescriptor = scriptObject.executeAndReturnError(&error) {
		print(output.descriptorAtIndex(1)?.stringValue) // Optional("TrackName")
		print(output.descriptorAtIndex(2)?.stringValue) // Optional("ArtistName")
	}
	if error != nil {
		print(error)
	}
}

descriptorAtIndexが1から始まることに注意