AVAudioPlayer plays music files and reads music files in ipod library
IOS Learning: AVAudioPlayer plays music files and reads music files in the ipod library
The first step is to import the AVFoundation framework and
Here is the code, all with comments:
[cpp] view plaincopy
/ /
/ / RootViewController.h
/ / SoundDemo
/ /
/ / Created by on 13-6-21.
/ / Copyright (c) 2013 DoubleMan. All rights reserved.
/ /
# import
# import
# import
@ interface RootViewController: UIViewController
{
AVAudioPlayer * player
}
@ property (nonatomic, retain) AVAudioPlayer * player
@ property (nonatomic, retain) UISlider * slider
@ property (nonatomic, retain) NSTimer * timer
@ end
[cpp] view plaincopy
/ /
/ / RootViewController.m
/ / SoundDemo
/ /
/ / Created by on 13-6-21.
/ / Copyright (c) 2013 DoubleMan. All rights reserved.
/ /
# import "RootViewController.h"
@ interface RootViewController ()
@ end
@ implementation RootViewController
@ synthesize player
@ synthesize slider
@ synthesize timer
-(id) initWithNibName: (NSString *) nibNameOrNil bundle: (NSBundle *) nibBundleOrNil
{
Self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]
If (self) {
/ / Custom initialization
}
Return self
}
-(void) viewDidLoad
{
[super viewDidLoad]
UIButton * musicPlay = [UIButton buttonWithType:UIButtonTypeRoundedRect]
MusicPlay.frame = CGRectMake (10,10,90,35)
[musicPlay setTitle:@ "Play" forState:UIControlStateNormal]
[musicPlay addTarget:self action:@selector (playMusic) forControlEvents:UIControlEventTouchUpInside]
[self.view addSubview:musicPlay]
UIButton * pause = [UIButton buttonWithType:UIButtonTypeRoundedRect]
Pause.frame = CGRectMake (115,10,90,35)
[pause setTitle:@ "Pause" forState:UIControlStateNormal]
[pause addTarget:self action:@selector (pause) forControlEvents:UIControlEventTouchUpInside]
[self.view addSubview:pause]
UIButton * stop = [UIButton buttonWithType:UIButtonTypeRoundedRect]
Stop.frame = CGRectMake (220,10,90,35)
[stop setTitle:@ "stop" forState:UIControlStateNormal]
[stop addTarget:self action:@selector (stop) forControlEvents:UIControlEventTouchUpInside]
[self.view addSubview:stop]
Slider = [[UISlider alloc] initWithFrame:CGRectMake (10,65,300,20)]
[slider addTarget:self action:@selector (sliderValueChange:) forControlEvents:UIControlEventValueChanged]
[self.view addSubview:slider]
/ /
NSString * path = [[NSBundle mainBundle] pathForResource:@ "find a reason to fall in love-Chenxi-Ai GE" ofType:@ "wav"]
NSURL * url = [NSURL fileURLWithPath:path]
Player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil]
/ / set the number of cycles.-1 is a continuous loop.
Player.numberOfLoops =-1
/ / ready to play
[player prepareToPlay]
/ / set playback volume
Player.volume = 50
/ / the current playback position, that is, starting from currentTime, is related to the seekTo method in android.
Player.currentTime = 15
/ / set proxy
Player.delegate = self
Int dur = player.duration
Slider.maximumValue = dur
/ / update the playback progress once a second
Timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector (updateSlider) userInfo:nil repeats:YES]
/ / read music files from ipod library
/ / MPMediaQuery * everything = [[MPMediaQuery alloc] init]
/ read condition
/ / MPMediaPropertyPredicate * albumNamePredicate =
/ / [MPMediaPropertyPredicate predicateWithValue: [NSNumber numberWithInt:MPMediaTypeMusic] forProperty: MPMediaItemPropertyMediaType]
/ / [everything addFilterPredicate:albumNamePredicate]
/ /
/ / NSLog (@ "Logging items from a generic query...")
/ / NSArray * itemsFromGenericQuery = [everything items]
/ / for (MPMediaItem * song in itemsFromGenericQuery) {
/ / NSString * songTitle = [song valueForProperty: MPMediaItemPropertyTitle]
/ / NSLog (@ "% @", songTitle)
/ /}
/ /
/ / [everything release]
}
/ / Update playback progress
-(void) updateSlider {
Slider.value = player.currentTime
}
/ / when the progress slider changes, jump to progress playback
-(void) sliderValueChange: (UISlider *) mSlider {
Player.currentTime = mSlider.value
NSLog (@ "value:% .0f", mSlider.value)
}
/ / stop
-(void) stop {
Player.currentTime = 0
[player stop]
}
/ / pause
-(void) pause {
[player pause]
NSLog (@ "pause")
}
/ / start playback
-(void) playMusic {
NSLog (@ "start play")
[player play]
}
# pragma mark-AVAudioPlayerDelegate
-(void) audioPlayerDidFinishPlaying: (AVAudioPlayer *) player successfully: (BOOL) flag {
/ / call when the playback is complete, it will only be called when the playback is finished, and will not be adjusted when the playback loop is completed.
[timer invalidate]
NSLog (@ "audioPlayerDidFinishPlaying")
}
/ * if an error occurs while decoding it will be reported to the delegate. , /
-(void) audioPlayerDecodeErrorDidOccur: (AVAudioPlayer *) player error: (NSError *) error {
/ / called in case of decoding error
}
-(void) didReceiveMemoryWarning
{
[super didReceiveMemoryWarning]
/ / Dispose of any resources that can be recreated.
}
-(void) dealloc
{
[player stop]
[player release]
[slider release]
[timer release]
[super dealloc]
}
@ end
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