iPhone App Tuts - Free iPhone App Tutorials & Resources

This tutorial is for the people who want to develop an application that can run a sound in background to the application. iPhone SDK 2.2 has provided AVFoundation framework to do this. It contains very simple APIs for play, pause, resume, control volume, forward, rewind. This tutorial will take you step by step to create a very simple application which can play an mp3 sound. At the end some additional properties and functions are briefly described.

Here is a step by step guide, if you have any questions, comment below. Good luck and enjoy!

Create Project:

1) Open XCode.

2) File -> New Project…

3) Select Application from left panel under iPhone OS as specified in the picture below.

4) Select View-Based-Application from right pane as specified in the picture below.

5) Click Choose…

6) File Dialog will open as specified in picture below. Select your location and enter project name as SoundPlay in the text box in front of Save As.

7) Click Save. The project is ready to start work on it.

Place Sound file:

8) Drag an mp3 file named sound1.mp3 from your file System and drop it in Resources of the project at left pan as shown in the picture.

9) A dialog will appear as shown in the picture below. Check “Copy items into destinations group’s folder (if needed)”.

10) Click Add.

11) You can see sound1.mp3 under Resources as in picture below.

Add required Framework:

12) Right click on FrameWorks and click Add->Existing Frameworks… as shown in picture below.

13) A dialog will open.

14) Select AVFoundation.framework as shown in picture below.

15) Click Add.

16) Another dialog will appear. Click Add.

17) Now you can see AVFoundation.framework under Frameworks of your project.

Add Code:

18) Open SondPlayViewController.m from your Project.

19) Write following code of import statements at the top of the file as shown in picture below.

#import

20) Uncomment the -

(void)viewDidLoad and add following code in that as sown in picture below.
NSError *error;
NSString *newAudioFile = [[NSBundlemainBundle] pathForResource:@”sound1″ofType:@”mp3″];
AVAudioPlayer *av = [[AVAudioPlayeralloc] initWithContentsOfURL:[NSURLfileURLWithPath:newAudioFile] error:NULL];
if(error) {
}
[av play];

21) Now You are ready to run and listen the sound. Click on Build and Go from the top. You will be shown a blank view and a sound will play. Enjoy the code.

AVAudioPlayer Additional Features:

AVAudioPlayer has following important commonly used properties and functions to control the sound.

volume: Property to set or get the volume of the playing sound. Value can range from 0.0 to 1.0.

duration: Property to get the time duration of the sound.

currentTime: Property to set ot get the current location of the playing sound. This can be used to forward and rewind a sound.

playing: Boolean variable to tell whether sound in playing or not.

volume: Property to get or set the volume of the playing sound. Value can range from 0.0 to 1.0.

pause: Function to pause the playing song.

Play: Function to play the song from the same location where pause is called.

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