iOS Development outreach-Sound playback

iOS Development outreach-Sound playback

First, Brief introduction

In simple terms, audio can be divided into 2 types

(1) Sound effects

Also known as "short audio", usually plays in the program for 1-2 seconds

Enhance the overall user experience with embellishment in the app

(2) Music

For example, the "background music" in the game, the general playing time is longer

Frame: Play audio needs to use avfoundation.framework frame

Second, the sound effects of playback

1. Get the path to the sound file

Nsurl *url = [[NSBundle mainbundle] urlforresource:@ "M_03.wav" withextension:nil];

2. Load the sound file to get the corresponding sound ID

Systemsoundid soundid = 0;

Audioservicescreatesystemsoundid (__bridge cfurlref) (URL), &soundid);

3. Play sound

Audioservicesplaysystemsound (Soundid);

Note : The audio file only needs to be loaded 1 times

4. Summary of common functions of sound playback

Loading sound files

Audioservicescreatesystemsoundid (Cfurlref infileurl, Systemsoundid *outsystemsoundid)

Releasing sound resources

Audioservicesdisposesystemsoundid (Systemsoundid Insystemsoundid)

Play sound

Audioservicesplaysystemsound (Systemsoundid Insystemsoundid)

Play sound with a little vibration

Audioservicesplayalertsound (Systemsoundid Insystemsoundid)

Iii. Examples of programs

First, import frameworks that need to be relied upon

Import sound file footage that needs to be played

　　

Description: Converting something in the avfoundation.framework frame to CF requires the use of bridging.

code example:

YYVIEWCONTROLLER.M file

1 //2 //YYVIEWCONTROLLER.M3 //14-Sound playback4 //5 //Created by Apple on 14-8-8.6 //Copyright (c) 2014 Yangyong. All rights reserved.7 //8 9 #import "YYViewController.h"Ten #import<AVFoundation/AVFoundation.h> One  A @interfaceYyviewcontroller () -  - @end the  - @implementationYyviewcontroller -  -- (void) Viewdidload + { - [Super Viewdidload]; + } A  at-(void) Touchesbegan: (Nsset *) touches withevent: (Uievent *)Event - { -     //1. Get the full path of the sound file -      -Nsurl *url=[[nsbundle Mainbundle]urlforresource:@"Buyao.wav"Withextension:nil]; -      in     //2. Load the sound file, create the sound effect ID (soundid, an ID corresponding to a sound file) -Systemsoundid soundid=0; toAudioservicescreatesystemsoundid (__bridge cfurlref) URL, &soundid); +      -     //Pass the ID of the sound file that needs to be destroyed to it to destroy the     //Audioservicesdisposesystemsoundid (soundid); *      $     //3. Play sound filesPanax Notoginseng     //the following two functions can be used to play a sound file, the first function with a vibration effect - Audioservicesplayalertsound (soundid); the     //Audioservicesplaysystemsound (< #SystemSoundID insystemsoundid#>) + } A  the @end

Note : Click on the screen to play the audio file.