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 

@interface ViewController ()
@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

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