Prevent iphone from going to sleep background playing music

Step One: Locate the item in the Resource folder Info.plist add a
Array of Required background modes
and add an element below, whose value is
APP plays Audio

Step Two:

Need to import the appropriate framework and header files
#import <AudioToolbox/AudioToolbox.h>
#import <AVFoundation/AVFoundation.h>

Step Three:
Disable automatic lock screen when program is running
[[Uiapplicationsharedapplication]setidletimerdisabled:yes];

Step four:
avaudiosession *audiosession = [avaudiosessionsharedinstance];
Nserror *err =nil;
[Audiosession setcategory:avaudiosessioncategoryplayandrecorderror:&err];
if (err)
{
NSLog (@ "audiosession:%@%d%@", [Errdomain], [Errcode], [[erruserinfo]description]);

}
[Audiosessionsetactive:yeserror:&err];
Err =nil
if (err)
{
NSLog (@ audiosession:%@%d%@ ", [Errdomain], [Errcode], [[erruserinfo]description]);

}




NSString * Musicfilepath = [[nsbundlemainbundle]pathforresource:@ ' Hatsune ミク-world is Mine ' oftype:@ "MP3"]; Create a music file path
Nsurl * musicurl= [[Nsurlalloc]initfileurlwithpath:musicfilepath];

Avaudioplayer * Theplayer = [[Avaudioplayeralloc]initwithcontentsofurl:musicurlerror:nil];

[Theplayerplay];
[Theplayersetvolume:1]; Set the volume size
theplayer.numberofloops = -1;//Set music playback times 1 to loop

[musicurlrelease];
[Theplayerrelease];