Music player based on Avplayer

1, recently wrote a music player on the demo, access to the information process, learned a lot of new things. A simple record of the process of writing encountered problems, Memo.

2, for ease of use, the player is written as a single case. h

Import the required libraries first

#import <AudioToolbox/AudioToolbox.h>

#import <AVFoundation/AVFoundation.h>

#import <objc/runtime.h>

Generate an instance of a player

@property (Nonatomic,strong) Avplayer *avplay;

@property (Nonatomic,strong) Avplayeritem *avitem;

3, implementing methods in. m files

Avplay = [[Avplayer alloc] init];

Add a notification to play complete

[[Nsnotificationcenter Defaultcenter] addobserver:self selector: @selector (playbackfinished:) Name: Avplayeritemdidplaytoendtimenotification Object:AVplay.currentItem];

-(void) playbackfinished: (nsnotification *) notification{

/*

The play is done here, such as playing the next song

*/

}

4, initialize the link to play

Avitem = [[Avplayeritem alloc] Initwithurl:[nsurl Urlwithstring:url]];

[Avplay Replacecurrentitemwithplayeritem:avitem];

5. Click the Play button to control playback and pause

_isplaying =!_isplaying;

if (_isplaying) {

[Self resume]; Start/Resume Playback

}else{

[Self pause]; Time out

}

-(void) resume{

[Avplay play];

}

-(void) pause{

[Avplay pause];

}

6, the previous song, the next song call 4 method, Avitem re-assign the value

7, get the current playback progress, assign a value to the progress bar

-(float) progress{

float percentage = (cmtimegetseconds (AVplay.currentItem.currentTime)/cmtimegetseconds (AVplay.currentItem.duration ));

return percentage;

}

8, get the value after the progress bar moved, adjust the playback progress

-(void) Movetosection: (cgfloat) section{

int32_t timescale = AVplay.currentItem.asset.duration.timescale;

Float64 playersection = cmtimegetseconds (AVplay.currentItem.duration) * section;

[Avplay seektotime:cmtimemakewithseconds (playersection, timescale) Tolerancebefore:kcmtimezero ToleranceAfter: Kcmtimezero];

}

9, in order to achieve background playback

Background Playback set Audio session type

Need to import header file #import <AVFoundation/AVFoundation.h>

Avaudiosession *session = [Avaudiosession sharedinstance];

Nserror *setcategoryerror = nil;

BOOL success = [Session Setcategory:avaudiosessioncategoryplayback error:&setcategoryerror];

if (!success)

{

Return

}

Nserror *activationerror = nil;

Success = [Session Setactive:yes error:&activationerror];

if (!success)

{

Return

}

Also find Required background modes in Info.plist file, add key value Select App plays audio or streams audio/video using AirPlay

10, to display the playback information when the lock screen is implemented

-(void) Applicationdidenterbackground: (uiapplication *) Application {

Let apps run in the background

[Application Beginbackgroundtaskwithexpirationhandler:nil];

In order to display the contents of the lock screen state

[[UIApplication sharedapplication] beginreceivingremotecontrolevents];

[Self becomefirstresponder]; Corresponding event

Refresh the lock screen when you first enter the background

[[Playmanager sharedinstance] configplayinginfo];

}

Determine the time type

-(void) Remotecontrolreceivedwithevent: (Uievent *) event

{

if (Event.type = = Uieventtyperemotecontrol) {

Switch (event.subtype) {

Case Uieventsubtyperemotecontrolplay:

[[Playmanager sharedinstance] resume]; Play

Break

Case Uieventsubtyperemotecontrolpause:

[[Playmanager sharedinstance] pause];//Pause

Break

Case Uieventsubtyperemotecontrolprevioustrack:

[[Playmanager sharedinstance] last]; Play the previous Song button

Break

Case Uieventsubtyperemotecontrolnexttrack:

[[Playmanager Sharedinstance] next]; Play next Song button

Break

Default

Break

}

}

}

After entering the front desk, cancel the corresponding

-(void) Applicationwillenterforeground: (uiapplication *) Application {

[[UIApplication sharedapplication] endreceivingremotecontrolevents];

[Self resignfirstresponder];

}

11. How the lock screen displays content

-(void) configplayinginfo{

if (_currentmodel!=nil) {

if (nsclassfromstring (@ "Mpnowplayinginfocenter")) {

Nsmutabledictionary *dict = [[Nsmutabledictionary alloc]init];

[Dict setobject:_currentmodel.title forkey:mpmediaitempropertytitle];//song name settings

[Dict setobject:_currentmodel.source_name forkey:mpmediaitempropertyartist];//singer name settings

[Dict setobject:[[mpmediaitemartwork alloc] initwithimage:[uiimage imagenamed:@ "Car"] Forkey: mpmediaitempropertyartwork];//album picture settings

[Dict setobject:[nsnumber Numberwithdouble:cmtimegetseconds (AVplay.currentItem.currentTime)] Forkey: Mpnowplayinginfopropertyelapsedplaybacktime]; Music is currently playing time

[Dict Setobject:[nsnumber numberwithfloat:1.0] The speed of the forkey:mpnowplayinginfopropertyplaybackrate];//progress cursor (this with Own playback rate adjustment, I default is the original speed play)

[Dict setobject:[nsnumber Numberwithdouble:cmtimegetseconds (AVplay.currentItem.duration)] Forkey: mpmediaitempropertyplaybackduration];//Song Total time setting

[[Mpnowplayinginfocenter Defaultcenter] setnowplayinginfo:dict];

}

[Atworkimg Sd_setimagewithurl:[nsurl Urlwithstring:_currentmodel.cover_url] completed:^ (UIImage *image, NSError * Error, Sdimagecachetype CacheType, Nsurl *imageurl) {

Lock screen display of the picture is the network, download and then switch, or there will be problems

Nsdictionary *dic = [[Mpnowplayinginfocenter defaultcenter] nowplayinginfo];

Nsmutabledictionary *mudic = [[Nsmutabledictionary alloc] initwithdictionary:dic];

[Mudic Setobject:[[mpmediaitemartwork alloc] initWithImage:atWorkImg.image] forkey:mpmediaitempropertyartwork];

[[Mpnowplayinginfocenter Defaultcenter] setnowplayinginfo:mudic];

}];

}

}

No handling of interruptions for the time being

Music player based on Avplayer