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.M 3//14-Audio Play 4//5//Created by Apple on 14-8-8. 6//Copyright (c) 2014 Yangyong. All rights reserved.  7//8 9 #import "YYViewController.h" #import <avfoundation/avfoundation.h>11 @interface Yyviewcontroller () 13 @end15 @implementation YYViewController17-(void) VIEWDIDLOAD19 {[Super viewdidload];21}22-(void) TOU Chesbegan: (Nsset *) touches withevent: (uievent *) Event24 {25//1. Get the full path of the sound file. Nsurl *url=[[nsbundle Mainbund le]urlforresource:@ "Buyao.wav" withextension:nil];28 29//2. Load the sound file, create the sound effect ID (soundid, one ID corresponds to a sound file)-Systemsoundi D soundid=0;31 Audioservicescreatesystemsoundid ((__bridge cfurlref) URL, &soundid); 32 33//Pass the ID of the sound file that needs to be destroyed to It can destroy the//audioservicesdisposesystemsoundid (Soundid); 35 36//3. Play audio files 37//The two functions below can be used to play audio files, the first function with a vibration effect 3 8 Audioservicesplayalertsound (Soundid),//audioservicesplaysystemsound (< #SystemSoundID insystemsoundid#>) 40}41 @end 

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

iOS Development outreach-Sound playback