Getting Started with UI music playback Audioservicesplay

-1-auidoservices is often used for cue tone playback, the audio has the following four characteristics:

1> length generally not more than 30 seconds, do not need to control the playback process

2> cannot be looped and cannot be paused

3> Cannot play stereo

4> Cannot play remix

-Create prompt Audio auidoservices: The preparatory work

1. Add a System class library. Audiotoolbox.framework

2. import header file in Viewcontroller #import <AudioToolbox/AudioToolbox.h>

A few common methods of tone:

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);

4. C-language function for sound playback

The function of sound play is written in C language, so we should pay attention to the difference with OC method in the process of using.

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)

Simple implementation of the program

#import "RootViewController.h"#import<AudioToolbox/AudioToolbox.h>@interfaceRootviewcontroller ()@end@implementationRootviewcontroller- (ID) Initwithnibname: (NSString *) Nibnameornil Bundle: (NSBundle *) nibbundleornil{ Self=[Super Initwithnibname:nibnameornil Bundle:nibbundleornil]; if(self) {//Custom Initialization    }    returnSelf ;}- (void) viewdidload{[Super Viewdidload]; [Self Creatuibutton];}-(void) creatuibutton{UIButton* btn=[UIButton Buttonwithtype:uibuttontypecustom]; Btn.frame=cgrectmake ( -, -, -, -); Btn.backgroundcolor=[Uicolor Graycolor]; [BTN Settitle:@"Play"Forstate:uicontrolstatenormal];    [btn Settitlecolor:[uicolor Cyancolor] forstate:uicontrolstatenormal];    [Btn addtarget:self Action: @selector (PRESSBTN:) forcontrolevents:uicontroleventtouchupinside]; [Self.view addsubview:btn];}-(void) Pressbtn: (ID) sender{//1. Get full path because loading sounds requires using cfurlref to load music, you can convert the path using a nsurl that converts to and from it .NSString * pathstr= [[NSBundle Mainbundle]pathforresource:@" Sound"OfType:@"wav"]; Nsurl* Url=[Nsurl Fileurlwithpath:pathstr]; //2. Create a sound ID an ID represents a sound fileSystemsoundid SID; //3. Bind the music file with the ID binding the URL strong to bind the SIDAudioservicescreatesystemsoundid (__bridge cfurlref) URL, &SID); //4. Play SoundAudioservicesplayalertsound (SID); //5. When we need to cancel the sound at the end of the sound playback, we need to use the following method to fix the function nameaudioservicesaddsystemsoundcompletion (SID, nil, nil,finishsound, nil);}//The function is the system method, the function name, the parameter is fixed, cannot modifyvoidFinishsound (Systemsoundid SID,void*finish) {  //6. Revoke SIDAudioservicesdisposesystemsoundid (SID);}

Note: When you click Play, you can play the audio file

Getting Started with UI music playback Audioservicesplay