Shulou(Shulou.com)06/01 Report--

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

Previous IOS Learning: customizing AlertView with UIWindow (the most basic code)

The next IOS Development Learning: MKMapView Custom CalloutView

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