使用AVAudioPlayer实现音乐播放器

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分享一个好用的快递查询API

快递单号查询

1. 关于AVAudioPlayer相关介绍

1.1 使用AVAudioPlayer播放音频，步骤相对简单，先建立一个AVAudioPlayer对象，再利用这个对象对音频数据进行相关的操作。
1.2 AVAudioPlayer主要有一下三类方法
（1）进行播放控制
方法的含义从英文名中可以很容易看出

- (BOOL)prepareToPlay;  /* get ready to play the sound. happens automatically on play. */- (BOOL)play;           /* sound is played asynchronously. */- (BOOL)playAtTime:(NSTimeInterval)time NS_AVAILABLE(10_7, 4_0); /* play a sound some time in the future. time is an absolute time based on and greater than deviceCurrentTime. */- (void)pause;          /* pauses playback, but remains ready to play. */- (void)stop;           /* stops playback. no longer ready to play. */

（2）加载音频文件

- (nullable instancetype)initWithContentsOfURL:(NSURL *)url error:(NSError **)outError;- (nullable instancetype)initWithData:(NSData *)data error:(NSError **)outError;- (nullable instancetype)initWithContentsOfURL:(NSURL *)url fileTypeHint:(NSString * __nullable)utiString error:(NSError **)outError NS_AVAILABLE(10_9, 7_0);- (nullable instancetype)initWithData:(NSData *)data fileTypeHint:(NSString * __nullable)utiString error:(NSError **)outError NS_AVAILABLE(10_9, 7_0);

（3）利用如下属性获得音频文件的相关信息（以下只列出常用的）

@property(readonly, getter=isPlaying) BOOL playing; /* is it playing or not? */@property(readonly) NSUInteger numberOfChannels;//得到音频的声道数目@property(readonly) NSTimeInterval duration; /* the duration of the sound. */@property NSTimeInterval currentTime;/* returns the current time associated with the output device */

更多内容可以参考AVAudioPlayer官方API。

2. 实现简单的播放器

2.1 功能介绍
简单的不能再简单：播放，暂停，停止。动态显示播放时间长度
程序截图如下
简单播放器

全部的程序代码放到了GitHub上： LeeLom GitHub
2.2 实现步骤介绍
（一）首先在Storyboard中建立一个UIProgressView，两个UIButton,一个UILabel。并且为他们分别建立Outlet。UIButton还要建立Action。

#import <UIKit/UIKit.h>@interface ViewController : UIViewController@property (strong, nonatomic) IBOutlet UIButton *btn1;@property (strong, nonatomic) IBOutlet UIButton *btn2;@property (strong, nonatomic) IBOutlet UILabel *show;@property (strong, nonatomic) IBOutlet UIProgressView *prog;- (IBAction)playMusic:(id)sender;- (IBAction)StopMusic:(id)sender;@end

（二）具体实现代码如下：

#import "ViewController.h"#import <AVFoundation/AVFoundation.h>@interface ViewController ()<AVAudioPlayerDelegate>@end@implementation ViewControllerAVAudioPlayer* audioPlayer;UIImage* playImage;UIImage* stopImage;UIImage* pauseImage;NSTimer* timer;CGFloat durationTime;- (void)viewDidLoad {    [super viewDidLoad];    //初始化变量    playImage = [UIImage imageNamed:@"Play.png"];    stopImage = [UIImage imageNamed:@"Stop.png"];    pauseImage = [UIImage imageNamed:@"Pause.png"];    //设置按钮图片    [self.btn1 setImage:playImage forState:UIControlStateNormal];    [self.btn2 setImage:stopImage forState:UIControlStateNormal];   //获取音频文件    NSURL* fileURL = [[NSBundle mainBundle]URLForResource:@"bzj" withExtension:@".mp3"];    //创建AVAudioPlayer对象    audioPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:fileURL error:nil];    //设置UILabel输出信息    NSString* msg = [NSString stringWithFormat:@"音频声道数目：%lu",(unsigned long)audioPlayer.numberOfChannels];    self.show.text = msg;    //UIlabel自动换行    self.show.lineBreakMode = NSLineBreakByWordWrapping;    self.show.numberOfLines = 0;    durationTime = audioPlayer.duration;    audioPlayer.delegate = self;}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}-(void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag{    if (player == audioPlayer && flag) {        NSLog(@"播放完成");        [self.btn1 setImage:playImage forState:UIControlStateNormal];    }}-(void)audioPlayerBeginInterruption:(AVAudioPlayer *)player{    if (player == audioPlayer) {        NSLog(@"被打断");    }}- (IBAction)playMusic:(id)sender {    if (audioPlayer.playing) {        //暂停播放        [self.btn1 setImage:pauseImage forState:UIControlStateNormal];        [audioPlayer pause];    }    else{        //播放音频        [self.btn1 setImage:playImage forState:UIControlStateNormal];        [audioPlayer play];    }    if (timer == nil) {        timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(updateProg) userInfo:nil repeats:YES];    }}- (IBAction)StopMusic:(id)sender {    [audioPlayer stop];    [timer invalidate];    timer = nil;    //音频数据初始化    self.prog.progress = 0;    audioPlayer.currentTime = 0;}-(void)updateProg{    self.prog.progress = audioPlayer.currentTime/durationTime;}@end

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