iOS 中 AVAudioPlayer(专门用来播放本地音乐)

先来介绍一下AVAudioPlayer:

AVAudioPlayer简介

在任何时间播放声音
播放声音文件或者内存的
循环播放声音
在同一时刻，播放多个声音，一个声音对应一个audio player，精确的 同步
控制相关播放的级别，立体声的位置， 你正在播放的每一个声音的速率
追种一个特别的点在一个声音文件中，前进或者后退到那个点上；
获得你可以使用的播放级别的测量数据

——— 注意：用代理去处理中断（像来电话了）和 去更新用户的界面，当音频播放完之后。
——— 注意：支持的音频格式有:AAC,ALAC,HE-AAC,iLBC,IMA4,MP3.
——— 注意 : 大家要特别注意了, AVAudioPlayer是专门播放本地音乐的,网络音乐是不可以播放的

再看一下他官方给的常用的API

主要API:
初始化：

- (instancetype nullable)initWithContentsOfURL:(NSURL * nonnull)url error:(NSError * nullable * nullable)outError

播放：

- (BOOL)play

暂停：

- (void)pause

停止：

- (void)stop

准备播放音频，返回值标志是否解析成功，是否可以播放。

- (BOOL)prepareToPlay

获取是否正在播放

@property(readonly, getter=isPlaying) BOOL playing

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设置音频音量，取值为0-1之间

@property float volume

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获取当前音频的总时长

@property(readonly) NSTimeInterval duration

AVAudioPlayerDelegate（简介）

用它来相应音频中断和音频解码错误，来实现音频的从放
完成播放(这个Delegate是最常用的, 一首音乐播放完成调用此方法来播放下一首, 实现连续播放)

- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer * nonnull)playersuccessfully:(BOOL)flag

解码错误：

- (void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer * nonnull)playererror:(NSError * nullable)error

处理中断： （一共四个，IOS9全部弃用）

- (void)audioPlayerBeginInterruption:(AVAudioPlayer * nonnull)player

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下面来看一下代码的实现:

//  ViewController.m//  MusicPlayer////  Created by dlios on 15/10/6.//  Copyright © 2015年 dlios. All rights reserved.//#import "ViewController.h"//导入系统库#import <AVFoundation/AVFoundation.h>@interface ViewController ()<AVAudioPlayerDelegate>@property (nonatomic, retain)AVAudioPlayer *player;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    [self.view setBackgroundColor:[UIColor whiteColor]];    [self getButtonControl];    [self getPlayer];}#pragma mark - 创建按钮和进度滑条方法- (void)getButtonControl{    //创建播放按钮    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];    [button setFrame:CGRectMake(0, 0, 40, 20)];    button.center = CGPointMake(375 / 2, 400);    [button setTitle:@"播放" forState:UIControlStateNormal];    [button setTitle:@"暂停" forState:UIControlStateSelected];    [button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:button];    /* 声音slider */    //创建slider    UISlider *slider = [[UISlider alloc] initWithFrame:CGRectMake(0, 0, 300, 20)];    slider.center = CGPointMake(375 / 2, 450);    /* 最大值 */    [slider setMaximumValue:100.];    /* 最小值 */    [slider setMinimumValue:0.];    /* 显示颜色 */    [slider setMaximumTrackTintColor:[UIColor purpleColor]];    /* 滑动后颜色 */    [slider setMinimumTrackTintColor:[UIColor cyanColor]];    /* 滑动就调用 */    [slider setContinuous:YES];    /* 滑动事件 */    [slider addTarget:self action:@selector(slider:) forControlEvents:UIControlEventValueChanged];    [self.view addSubview:slider];    /* 进度slider */    UISlider *schSlider = [[UISlider alloc] initWithFrame:CGRectMake(0, 0, 300, 20)];    schSlider.center = CGPointMake(375 / 2, 500);    [schSlider setMaximumValue:280.];    [schSlider setMinimumValue:0.];    [schSlider setContinuous:YES];    [schSlider addTarget:self action:@selector(sliderClick:) forControlEvents:UIControlEventValueChanged];    [self.view addSubview:schSlider];}#pragma mark - 播放方法- (void)getPlayer{    /* 获取本地文件 */    NSBundle *bundle = [NSBundle mainBundle];    NSString *urlString = [bundle pathForResource:@"李荣浩-模特" ofType:@"mp3"];    /* 初始化url */    NSURL *url = [[NSURL alloc] initFileURLWithPath:urlString];    /* 初始化音频文件 */    self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];    /* 加载缓冲 */    [self.player prepareToPlay];}#pragma mark - button 点击方法- (void)click:(UIButton *)button{    if (button.selected == NO) {        [self.player play];        button.selected = YES;    }else{        button.selected = NO;        [self.player pause];    }}#pragma mark - 声音滑动事件方法- (void)slider:(UISlider *)slider{    self.player.volume = slider.value;}#pragma mark - 进度滑动事件- (void)sliderClick:(UISlider *)slider{    self.player.currentTime = slider.value;}#pragma mark - player Dlegate//结束时调用- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag{    NSLog(@"结束了");}//解析错误调用- (void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer *)player error:(NSError *)error{}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end