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How to play a short sound clip with AudioToolbox in Swift

Updated on October 15, 2015


Here you’ll learn how to play a short sound clip by using AudioToolbox.framework in Swift language.

We’ve setup an XCode demo project that looks like this:

Demo XCode project
Demo XCode project


Let’s start by importing AudioToolbox into our ViewController.swift file. The great news about the latest version of XCode is that you can import an Apple framework without linking it into Libraries in General tab. All you have to do is to import your needed framework with its real name:

import AudioToolbox

Awesome, right?

This doesn't mean that if you add this framework to Linked Binary and Libraries in the General tab in XCode that app will not work, you are free to do that if you feel more comfortable. For example, if you want to implement some ad network different than iAd you must link AudioToolbox in that way to your project since their library will need such service.

Ok, we have declared an IBAction of the Play Sound Clip button by ctrl+drag from the button to the .swift file, inside the ViewController class, and before adding the code to play our sound clip, you need to drag a .wav or .mp3 sound file into Supporting Files folder in XCode. The sound file in our demo project is called “glassSound” and it’s an .mp3.

One more thing, we must create a couple of global variables for soundURL and SystemSoundID, you can put them right below the imports:

var soundURL: NSURL?
var soundID:SystemSoundID = 0


And here’s the code to make our Play button play our sound clip:

@IBAction func playSoundClip(sender: AnyObject) {
    let filePath = NSBundle.mainBundle().pathForResource("glassSound", ofType: "mp3")
    soundURL = NSURL(fileURLWithPath: filePath!)
    AudioServicesCreateSystemSoundID(soundURL, &soundID)
    AudioServicesPlaySystemSound(soundID)
}

Let’s check what happens here line by line:

  1. This is our IBAction for the play button
  2. Here we get the path of our sound file, which is stored into the device default document directory and it’s called “glassSound” and its type is “mp3″
  3. Here we get the URL of our sound file as an NSURL with the global variable declared before
  4. Create a SystemSoundID, needed to play the sound clip later
  5. Finally play the sound calling Audio Services, which is a property of AudioToolbox framework.


Pretty easy, right? Run your project and tap play to check it out. There’s nothing else to do with AudioToolbox in this tutorial, it has no delegates and it’s mostly used to play short sound clips. You can add some new buttons and repeat the steps mentioned above to play multiple sounds, just assign a different clip to each button.

If you want to play long music files you need to use AVAudioPlayer, which is part of AVFoundation framework. You can find a tutorial about that property on our profile.


Thanks for reading, you can download our demo project here:

DOWNLOAD SAMPLE PROJECT


© 2015 FV iMAGINATION

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      Matt 24 months ago

      Hi,

      Can you advise if the filename can be a String from an array? These will all have a different sound, and depending on which cell in a tableview is clicked on, the audio player will play the file with the name stated in the array.

      Thanks

      Matthias

    • FV Imagination profile image
      Author

      FV iMAGINATION 24 months ago from San Marino, San Marino

      Yes, you can drag multiple sound files into the project, but then you have to create a play method for each sound.

      Cheers!

    • profile image

      Mina 23 months ago

      Just to follow up on the uatpde of this issue on your web site and would really want to let you know how much I prized the time you took to produce this helpful post. In the post, you spoke on how to actually handle this problem with all convenience. It would be my pleasure to get some more tips from your blog and come as much as offer other people what I have benefited from you. I appreciate your usual great effort.

    • profile image

      Steve Graff 22 months ago

      This is a great tutorial! I'm just learning mobile development with Swift and this perfectly displayed how to play a sound when clicking on a button. Thank you!

    • profile image

      fvimagination 22 months ago

      you're welcome!

      Don't forget to check our Swift templates on http://codecanyon.net/user/fvimagination

    • profile image

      Trent 19 months ago

      Finally!! A simple tutorial on how to correctly add sound to a button in Swift! Many other Swift tutorials just give you error messages. This method actually works!! Thank you!

    • FV Imagination profile image
      Author

      FV iMAGINATION 19 months ago from San Marino, San Marino

      You're welcome!

    • profile image

      TJ 18 months ago

      Very cool! Can you explain how to trigger a random sound when the button is pressed?

    • FV Imagination profile image
      Author

      FV iMAGINATION 18 months ago from San Marino, San Marino

      Hi, the code for the button may look like this:

      let soundName == ""

      let randomSound = arc4random() % 2 // this will generate a random number from 0 to 1

      // below you put the names of your 2 sound files

      if randomSound == 0 { soundName = "myFirstSound"

      } else { soundName = "mySecondSound" }

      let filePath = NSBundle.mainBundle().pathForResource(soundName, ofType: "mp3")

      soundURL = NSURL(fileURLWithPath: filePath!)

      AudioServicesCreateSystemSoundID(soundURL, &soundID)

      AudioServicesPlaySystemSound(soundID)

      Cheers!

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