ios開發之--AVAudioPlayer/AVPlayer的應用

項目當中用到了音頻播放器，所以就參考官方文檔，寫了一個，代碼如下：

.h

#import <UIKit/UIKit.h>

@interface hAudioPlayViewController : UIViewController
@property(nonatomic,strong)NSString *titleStr;//音樂名字
@property(nonatomic,strong)NSString *kMusicFile;//音樂文件
@property(nonatomic,strong)NSString *nameStr;//演唱者
@end

.m

#import "hAudioPlayViewController.h"
#import <AVFoundation/AVFoundation.h>

@interface hAudioPlayViewController ()<CustomNavigationBarDelegate,AVAudioPlayerDelegate>

@property (nonatomic,strong) AVAudioPlayer *audioPlayer;//播放器
@property (weak, nonatomic) IBOutlet UIImageView *bgImg;
@property (weak, nonatomic) IBOutlet UILabel *nameLab;
@property (weak, nonatomic) IBOutlet UIButton *playBtn;
@property (weak, nonatomic) IBOutlet UIProgressView *progressV;
@property (weak ,nonatomic) NSTimer *timer;//進度更新定時器
@property (weak, nonatomic) IBOutlet UILabel *timeLab;
@property (assign, nonatomic) BOOL isPlay;

@end

@implementation hAudioPlayViewController


- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    
    self.view.backgroundColor =BackgroundColor;
    CustomNavigationBar *nav  = [[CustomNavigationBar alloc]initWithFrame:CGRectMake(0, 0, KscreenW, NavHeight) withTitle:[NSString stringWithFormat:@"%@",self.titleStr] withLeftBtnHidden:NO withRightBtn:YES];
    nav.delegate = self;
    [self.view addSubview:nav];
    
    self.isPlay = NO;
    [self creatUI];
}

-(void)leftBtnAction:(id)sender
{
    [self.navigationController popViewControllerAnimated:YES];
    [self.audioPlayer pause];
}

-(void)creatUI
{
    self.nameLab.text = self.nameStr;
    [self play];
    self.playBtn.selected = YES;
}

-(NSTimer *)timer{
    if (!_timer) {
        _timer=[NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(updateProgress) userInfo:nil repeats:true];
    }
    return _timer;
}

/**
 *  創建播放器
 *
 *  @return 音頻播放器
 */
-(AVAudioPlayer *)audioPlayer{
    if (!_audioPlayer) {

        //這段代碼是設置聲道，防止設備在揚聲器的狀態下沒有聲音
        AVAudioSession *audioSession = [AVAudioSession sharedInstance];
        [audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
        [audioSession setActive:YES error:nil];  
        
        NSURL *url = [NSURL URLWithString:self.kMusicFile];
        
        //將文件先下載到本地，然后再播放
        NSData *audioData = [NSData dataWithContentsOfURL:url];
        NSString *docDirPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
        NSString *filePath = [NSString stringWithFormat:@"%@/%@.mp3",docDirPath,@"temp"];
        [audioData writeToFile:filePath atomically:YES];
        
        NSError *error=nil;
        //初始化播放器，注意這里的Url參數只能時文件路徑，不支持HTTP Url
        _audioPlayer=[[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL URLWithString:filePath] error:&error];
        //設置播放器屬性
        _audioPlayer.numberOfLoops=0;//設置為0不循環
        _audioPlayer.delegate=self;
        [_audioPlayer prepareToPlay];//加載音頻文件到緩存
        if(error){
            NSLog(@"初始化播放器過程發生錯誤,錯誤信息:%@",error.localizedDescription);
            return nil;
        }
    }
    return _audioPlayer;
}

/**
 *  播放音頻
 */
-(void)play{
    if (![self.audioPlayer isPlaying]) {
        [self.audioPlayer play];
        self.timer.fireDate=[NSDate distantPast];//恢復定時器
    }
}

/**
 *  暫停播放
 */
-(void)pause{
    if ([self.audioPlayer isPlaying]) {
        [self.audioPlayer pause];
        self.timer.fireDate=[NSDate distantFuture];//暫停定時器，注意不能調用invalidate方法，此方法會取消，之后無法恢復
        
    }
}

/**
 *  點擊播放/暫停按鈕
 *
 *  @param sender 播放/暫停按鈕
 */
- (IBAction)playClick:(UIButton *)sender {
    sender.selected = !sender.selected;
    
    if (sender.selected==self.isPlay) {
        [self pause];
    }else
    {
        [self play];
    }
}

/**
 *  更新播放進度
 */
-(void)updateProgress{
    float progress= self.audioPlayer.currentTime /self.audioPlayer.duration;
    [self.progressV setProgress:progress animated:true];
    int current = (int)self.audioPlayer.currentTime;
    int duration = (int)self.audioPlayer.duration;
    self.timeLab.text = [NSString stringWithFormat:@"%@/%@",[self timeFormatted:current],[self timeFormatted:duration]];
}

/**
 *  把秒轉換為時間格式
 */

-(NSString *)timeFormatted:(int)totalSeconds
{
    int seconds = totalSeconds % 60;
    int minutes = (totalSeconds / 60) % 60;
//    int hours = totalSeconds / 3600;
    
    return [NSString stringWithFormat:@"%02d:%02d",minutes, seconds];
}

#pragma mark - 播放器代理方法
-(void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag{
    NSLog(@"音樂播放完成...");
}

相關的時間轉化，暫停與播放等基本功能已完善，不過沒有做其他更精細化的操作，譬如保存進度，第二次進來繼續上次的進度播放；快進等操作！

 

附 

官方文檔地址：

https://developer.apple.com/documentation/avfoundation/avaudioplayer?language=objc

 

碰到問題，設備在揚聲器下沒有聲音：

1，原因：

沒有設置聲道；

AVAudioSession是一個單例，無需實例化即可直接使用。AVAudioSession在各種音頻環境中起着非常重要的作用

針對不同的音頻應用場景,需要設置不同的音頻回話分類

2，解決方法：

在初始化AVAudioPlayer之前，設置聲道，代碼如下：

AVAudioSession *audioSession = [AVAudioSession sharedInstance];
        [audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
        [audioSession setActive:YES error:nil];  

 

效果如下：

 

 

上面描述的是AudioPlayer的用法，下面說下AVPlayer的用法，他們兩直接的區別如果同時播放音頻的話，AudioPlayer比較適合播放本地的文件，而AVPlayer則可以播放在線的音頻文件，當然也可以播放視頻文件，這里先不說，比較簡單，代碼如下：

#import "hAVPlayerViewController.h"
#import <AVFoundation/AVFoundation.h>

@interface hAVPlayerViewController ()<CustomNavigationBarDelegate>
@property (weak, nonatomic) IBOutlet UILabel *titleLab;
@property (weak, nonatomic) IBOutlet UIButton *playBtn;
@property (weak, nonatomic) IBOutlet UILabel *timeLab;
@property (assign, nonatomic) BOOL isPlay;//用來標記是否播放
@property (weak, nonatomic) IBOutlet UIProgressView *progress;

//播放器
@property (nonatomic,strong)AVPlayer *avPlayer;

//監控進度
@property (nonatomic,strong)NSTimer *avTimer;

@property (weak, nonatomic) IBOutlet NSLayoutConstraint *imgTop;

@end

@implementation hAVPlayerViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    
    self.view.backgroundColor =BackgroundColor;
    CustomNavigationBar *nav  = [[CustomNavigationBar alloc]initWithFrame:CGRectMake(0, 0, KscreenW, NavHeight) withTitle:[NSString stringWithFormat:@"%@",self.model.title] withLeftBtnHidden:NO withRightBtn:YES];
    nav.delegate = self;
    [self.view addSubview:nav];
    
    self.imgTop.constant = NavHeight;
    
    self.isPlay = NO;
    
    //mp3播放網址
    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"%@",self.model.music_url]];
    
    //播放器初始化
    self.avPlayer = [[AVPlayer alloc]initWithURL:url];
   /*
    //設置播放器初始音量
    self.avPlayer.volume =1;
    
    //初始0音量
    self.volume.value =5.0f;
    
    //設置最大值最小值音量
    self.volume.maximumValue =10.0f;
    
    self.volume.minimumValue =0.0f;
*/
    
    //監控播放進度
    self.avTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(timer) userInfo:nil repeats:YES];

    self.titleLab.text = [NSString stringWithFormat:@"%@",self.model.title];
    self.playBtn.selected = YES;
    
    [self.avPlayer play];
}

-(void)leftBtnAction:(id)sender
{
    [self.avPlayer pause];
    [self.navigationController popViewControllerAnimated:YES];
}

//監控播放進度方法
- (void)timer
{
    float progress= CMTimeGetSeconds(self.avPlayer.currentItem.currentTime) / CMTimeGetSeconds(self.avPlayer.currentItem.duration);
    [self.progress setProgress:progress animated:true];
    int current = (int)CMTimeGetSeconds(self.avPlayer.currentItem.currentTime);
    int duration = CMTimeGetSeconds(self.avPlayer.currentItem.duration);
    self.timeLab.text = [NSString stringWithFormat:@"%@/%@",[self timeFormatted:current],[self timeFormatted:duration]];
}

/**
 *  把秒轉換為時間格式
 */
-(NSString *)timeFormatted:(int)totalSeconds
{
    int seconds = totalSeconds % 60;
    int minutes = (totalSeconds / 60) % 60;
    //    int hours = totalSeconds / 3600;
    
    return [NSString stringWithFormat:@"%02d:%02d",minutes, seconds];
}


//播放/暫停
- (IBAction)play:(id)sender {
    
    UIButton *btn = (UIButton *)sender;
    
    btn.selected = !btn.selected;
    
    if (btn.selected == self.isPlay) {
        [self.avPlayer pause];
    }else{
        [self.avPlayer play];
    }
}

 

僅做記錄！