Play sound
the ability to play sound effects may be encountered during iOS development
In fact very simple, iOS has provided a framework for directly responsible for playing sound audiotoolbox.framework
New Project Testwechatsounds
Import Audiotoolbox.framework to a new project
After the import succeeds the following figure
The project directory is as follows
Next we add several CAF-formatted audio files to the project
Next we open the project default generated Viewcontroller to add code
Import Audiotoolbox
Copy Code code as follows:
#import <AudioToolbox/AudioToolbox.h>
Add button to view to play sound after clicking
Copy Code code as follows:
-(void) Viewdidload {
[Super Viewdidload];
Do no additional setup after loading the view, typically from a nib.
UIButton *btn1=[[uibutton Alloc] Initwithframe:cgrectmake (20, 100, 120, 36)];
[Btn1 Settitlecolor:[uicolor Blackcolor] forstate:uicontrolstatenormal];
[Btn1 settitle:@ "Warning" forstate:uicontrolstatenormal];
[Btn1 addtarget:self Action: @selector (Btn1act) forcontrolevents:uicontroleventtouchupinside];
[Self.view ADDSUBVIEW:BTN1];
UIButton *btn2=[[uibutton Alloc] Initwithframe:cgrectmake (20, 150, 120, 36)];
[Btn2 Settitlecolor:[uicolor Blackcolor] forstate:uicontrolstatenormal];
[Btn2 settitle:@ "error" forstate:uicontrolstatenormal];
[Btn2 addtarget:self Action: @selector (Btn2act) forcontrolevents:uicontroleventtouchupinside];
[Self.view ADDSUBVIEW:BTN2];
}
Achieve playback effects
Copy Code code as follows:
-(void) Btn1act {
[Self playsoundeffect:@ "ALARM.CAF"];
}
-(void) Btn2act {
[Self playsoundeffect:@ "CT-ERROR.CAF"];
}
-(void) Playsoundeffect: (NSString *) name{
NSString *audiofile=[[nsbundle Mainbundle] Pathforresource:name Oftype:nil];
Nsurl *fileurl=[nsurl Fileurlwithpath:audiofile];
1. Get System sound ID
Systemsoundid soundid=0;
/**
* Infileurl: Audio file URL
* Outsystemsoundid: Sound ID (This function adds the sound file to the System Audio service and returns a long shaping ID)
*/
Audioservicescreatesystemsoundid ((__bridge cfurlref) (FILEURL), &soundid);
If you need to perform some action after playback, you can call the following method to register a playback completion callback function
Audioservicesaddsystemsoundcompletion (soundid, NULL, NULL, soundcompletecallback, NULL);
2. Play Audio
Audioservicesplaysystemsound (Soundid)//Play Sound
Audioservicesplayalertsound (Soundid)/play sound and vibrate
}
void Soundcompletecallback (systemsoundid soundid,voidvoid * clientdata) {
NSLog (@ "Play complete ...");
}
Code Section screenshot
All right, play the sound effect basically.
Play Music
We also use the framework provided by Apple Avfoundation.framework
First, create a new project
Name the project: testavgoundation
Next, import the framework
After the import was successful the following
Project structure
Before we start writing code, we find a song to put in the project
Here we have a more classic song Kin's friend
Again, we open the project default generated VIEWCONTROLLER.M to add playback functionality inside
First, import the header file
Copy Code code as follows:
#import <AVFoundation/AVFoundation.h>
Next, create a control
Copy Code code as follows:
@property (Nonatomic,strong) avaudioplayer *audioplayer;//player
@property (Strong, nonatomic) Uiprogressview *playprogress;//playback Progress
@property (Strong, nonatomic) UIButton *playorpause; Play/pause button (if tag is 0 considered to be paused, 1 is playback state)
@property (Strong, nonatomic) Nstimer *timer;//Progress Update timer
Initialize interface
Copy Code code as follows:
-(void) Viewdidload {
[Super Viewdidload];
Do no additional setup after loading the view, typically from a nib.
Self.view.backgroundcolor=[uicolor Lightgraycolor];
[Self inituserface];
}
-(void) inituserface{
Add playprogress
_playprogress= [[Uiprogressview alloc] initwithprogressviewstyle:uiprogressviewstyledefault];
_playprogress.frame=cgrectmake (0, Self.view.bounds.size.width, 36);
[Self.view addsubview:_playprogress];
Add Play button
_playorpause=[[uibutton alloc]initwithframe:cgrectmake (0, 150, 120, 36)];
[_playorpause settitle:@ "Play" forstate:uicontrolstatenormal];
[_playorpause Settitlecolor:[uicolor Blackcolor] forstate:uicontrolstatenormal];
[_playorpause addtarget:self Action: @selector (playorpauseact:) forcontrolevents:uicontroleventtouchupinside];
[Self.view Addsubview:_playorpause];
}
Add a few playback, pause, modify the song progress bar display method
Copy Code code as follows:
-(Nstimer *) timer{
if (!_timer) {
_timer=[nstimer scheduledtimerwithtimeinterval:0.5 target:self selector: @selector (updateprogress) Userinfo:nil Repeats:true];
}
return _timer;
}
-(Avaudioplayer *) audioplayer{
if (!_audioplayer) {
NSString *urlstr=[[nsbundle mainbundle]pathforresource:@ "friends. mp3" Oftype:nil];
Nsurl *url=[nsurl FILEURLWITHPATH:URLSTR];
Nserror *error=nil;
Initialize the player, note that the URL parameter here can only be a file path, does not support the HTTP URL
_audioplayer=[[avaudioplayer Alloc]initwithcontentsofurl:url error:&error];
Set player Properties
_audioplayer.numberofloops=0;//set to 0 not loop
_audioplayer.delegate=self;
[_audioplayer preparetoplay];//load audio files to cache
if (Error) {
NSLog (@ "Initialization of player process error, error message:%@", error.localizeddescription);
return nil;
}
}
return _audioplayer;
}
/**
* Play Audio
*/
-(void) play{
if (![ Self.audioplayer IsPlaying]) {
[Self.audioplayer play];
Self.timer.firedate=[nsdate distantpast];//Recovery Timer
}
}
/**
* Pause Playback
*/
-(void) pause{
if ([Self.audioplayer isplaying]) {
[Self.audioplayer pause];
Self.timer.firedate=[nsdate distantfuture];//Pause Timer, note that the Invalidate method cannot be invoked, this method is canceled, and cannot be recovered
}
}
/**
* Update Playback Progress
*/
-(void) updateprogress{
float progress= self.audioplayer.currenttime/self.audioplayer.duration;
[Self.playprogress setprogress:progress animated:true];
}
#pragma mark-Player agent method
-(void) audioplayerdidfinishplaying: (Avaudioplayer *) player successfully: (BOOL) flag{
NSLog (@ "Music playback complete ...");
[_playorpause settitle:@ "Play" forstate:uicontrolstatenormal];
}
We add click events to the play button
Copy Code code as follows:
-(void) Playorpauseact: (UIButton *) sender{
NSString *strplay=sender.titlelabel.text;
NSLog (@ "strplay=%@", Strplay);
if ([Strplay isequaltostring:@ "Play"]) {
[Sender settitle:@ "suspend" forstate:uicontrolstatenormal];
[Self play];
}else{
[Sender settitle:@ "Play" forstate:uicontrolstatenormal];
[Self pause];
}
}
Okay, so here we are, we're done, we can try.
A careful friend may find that our app plays music, and if we switch to backstage, we find that the music is paused and turned on again.
If you want to play music backstage, we need to change two places.
1, open the project plist file
Add an item
2, open VIEWCONTROLLER.M Find the following method to add a section
Okay, let's try the backstage run.
