iOS音乐播放器（歌词自动滚动）

iOS音乐播放器（歌词自动滚动）

简单实现基于IOS的音乐播放器，并且带有歌词，随播放自动滚动，实现效果如下：

 

首先，需要建立一个解析歌词的类ZMPlrc，解析歌词主要就是把时间和对应的歌词分离出来，然后存储到数组中。

ZMPlrc.h

 

#import <Foundation/Foundation.h>

@interface ZMPlrc : NSObject

/**
 时间
 */
@property (nonatomic,strong)NSMutableArray *timeArray;
/**
 歌词
 */
@property (nonatomic,strong)NSMutableArray *wordArray;

/**
 解析歌词
 */
- (void)parselrc;

@end

ZMPlrc.m

 

 

#import "ZMPlrc.h"

@implementation ZMPlrc

- (instancetype)init
{
    self = [super init];
    if (self) {
        _timeArray = [NSMutableArray array];
        _wordArray = [NSMutableArray array];
    }
    return self;
}

/**
 歌词路径
 */
- (NSString *)getLrcPath{
    return [[NSBundle mainBundle] pathForResource:@"梁静茹-偶阵雨" ofType:@"lrc"];
}

/**
 解析歌词
 */
- (void)parselrc{
    NSString *content = [NSString stringWithContentsOfFile:[self getLrcPath] encoding:NSUTF8StringEncoding error:nil];
    
    NSArray *sepArray = [content componentsSeparatedByString:@"["];
    for (int i = 5; i < sepArray.count; i ++) {
        //有两个元素，一个是时间，一个是歌词
        NSArray *arr = [sepArray[i] componentsSeparatedByString:@"]"];
        //NSLog(@"%@",sepArray[i]);
        
        [_timeArray addObject:arr[0]];
        [_wordArray addObject:arr[1]];
        
    }
    
    //NSLog(@"%@",content);
}

@end

 

 

接着，在storyboard中添加必要的控件。

最后，就可以在控制器中实现了ZMPViewController，在实现过程中，主要就是监听音频播放player的播放时间，跟之前解析好的每句歌词对应的时间进行处理。

ZMPViewController.h

 

#import <UIKit/UIKit.h>

@interface ZMPViewController : UIViewController
@property (weak, nonatomic) IBOutlet UITableView *lrcTableView;
@property (weak, nonatomic) IBOutlet UISlider *timeSlider;
@property (weak, nonatomic) IBOutlet UILabel *currentTimeLabel;

@property (weak, nonatomic) IBOutlet UILabel *totalTimeLabel;


@property (weak, nonatomic) IBOutlet UIButton *lastMusicBtnClick;
- (IBAction)playBtnClick:(UIButton *)sender;
- (IBAction)preMusicBtnClick:(id)sender;
- (IBAction)valueChange:(UISlider *)sender;

- (IBAction)nextMusicBtnClick:(id)sender;
@end

ZMPViewController.m

 

 

#import "ZMPViewController.h"
#import <AVFoundation/AVFoundation.h>
#import "ZMPlrc.h"

@interface ZMPViewController ()<UITableViewDataSource,UITableViewDelegate>{
    //音乐播放器
    AVAudioPlayer *player;
    
    ZMPlrc *lrc;
    
    NSInteger currentRow;
}

@end

@implementation ZMPViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically <span id="2_nwp" style="padding: 0px; width: auto; height: auto; float: none;"><a target=_blank id="2_nwl" href="http://cpro.baidu.com/cpro/ui/uijs.php?adclass=0&app_id=0&c=news&cf=1001&ch=0&di=128&fv=18&is_app=0&jk=e21eb48420ee3a55&k=from&k0=from&kdi0=0&luki=4&mcpm=0&n=10&p=baidu&q=65035100_cpr&rb=0&rs=1&seller_id=1&sid=553aee2084b41ee2&ssp2=1&stid=9&t=tpclicked3_hc&td=1836545&tu=u1836545&u=http%3A%2F%2Fwww%2Ebubuko%2Ecom%2Finfodetail%2D826622%2Ehtml&urlid=0" target="_blank" mpid="2" style="padding: 0px; color: rgb(51, 51, 51); text-decoration: none;"><span style="padding: 0px; color: rgb(0, 0, 255); width: auto; height: auto;">from</span></a></span> a nib.
    
    [self initPlayer];
    
    //侦听当前时间
    [NSTimer scheduledTimerWithTimeInterval:0.5 <span id="3_nwp" style="padding: 0px; width: auto; height: auto; float: none;"><a target=_blank id="3_nwl" href="http://cpro.baidu.com/cpro/ui/uijs.php?adclass=0&app_id=0&c=news&cf=1001&ch=0&di=128&fv=18&is_app=0&jk=e21eb48420ee3a55&k=target&k0=target&kdi0=0&luki=8&mcpm=0&n=10&p=baidu&q=65035100_cpr&rb=0&rs=1&seller_id=1&sid=553aee2084b41ee2&ssp2=1&stid=9&t=tpclicked3_hc&td=1836545&tu=u1836545&u=http%3A%2F%2Fwww%2Ebubuko%2Ecom%2Finfodetail%2D826622%2Ehtml&urlid=0" target="_blank" mpid="3" style="padding: 0px; color: rgb(51, 51, 51); text-decoration: none;"><span style="padding: 0px; color: rgb(0, 0, 255); width: auto; height: auto;">target</span></a></span>:self selector:@selector(updateTime) userInfo:nil repeats:YES];
    
    lrc = [[ZMPlrc alloc] init];
    [lrc parselrc];
    
    
    [self.lrcTableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"CELL"];
    [self.lrcTableView reloadData];
    
}

- (void)updateTime{
    CGFloat currentTime = player.currentTime;
    
    //
    self.currentTimeLabel.text = [NSString stringWithFormat:@"%02d:%02d",(int)currentTime / 60, (int)currentTime % 60];
    self.timeSlider.value = currentTime / player.duration;
    
    for (int i = 0; i < lrc.timeArray.count; i ++) {
        
        NSArray *arr = [lrc.timeArray[i] componentsSeparatedByString:@":"];
        
        CGFloat compTime = [arr[0] integerValue]*60 + [arr[1] floatValue];
        
        if (player.currentTime > compTime)
        {
            currentRow = i;
        }
        else
        {
            break;
        }
    }
    
    [self.lrcTableView reloadData];
    [self.lrcTableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:currentRow inSection:0] atScrollPosition:UITableViewScrollPositionMiddle animated:YES];
}

/**
 初始化音乐播放器
 */
- (void)initPlayer{
    
    
    //后台播放音频设置
    AVAudioSession *session = [AVAudioSession sharedInstance];
    [session setActive:YES error:nil];
    [session setCategory:AVAudioSessionCategoryPlayback error:nil];
    
    //让<span id="4_nwp" style="padding: 0px; width: auto; height: auto; float: none;"><a target=_blank id="4_nwl" href="http://cpro.baidu.com/cpro/ui/uijs.php?adclass=0&app_id=0&c=news&cf=1001&ch=0&di=128&fv=18&is_app=0&jk=e21eb48420ee3a55&k=app&k0=app&kdi0=0&luki=9&mcpm=0&n=10&p=baidu&q=65035100_cpr&rb=0&rs=1&seller_id=1&sid=553aee2084b41ee2&ssp2=1&stid=9&t=tpclicked3_hc&td=1836545&tu=u1836545&u=http%3A%2F%2Fwww%2Ebubuko%2Ecom%2Finfodetail%2D826622%2Ehtml&urlid=0" target="_blank" mpid="4" style="padding: 0px; color: rgb(51, 51, 51); text-decoration: none;"><span style="padding: 0px; color: rgb(0, 0, 255); width: auto; height: auto;">app</span></a></span>支持接受远程控制事件
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    
    NSString *path = [[NSBundle mainBundle] pathForResource:@"梁静茹-偶阵雨" ofType:@"<span id="5_nwp" style="padding: 0px; width: auto; height: auto; float: none;"><a target=_blank id="5_nwl" href="http://cpro.baidu.com/cpro/ui/uijs.php?adclass=0&app_id=0&c=news&cf=1001&ch=0&di=128&fv=18&is_app=0&jk=e21eb48420ee3a55&k=mp3&k0=mp3&kdi0=0&luki=3&mcpm=0&n=10&p=baidu&q=65035100_cpr&rb=0&rs=1&seller_id=1&sid=553aee2084b41ee2&ssp2=1&stid=9&t=tpclicked3_hc&td=1836545&tu=u1836545&u=http%3A%2F%2Fwww%2Ebubuko%2Ecom%2Finfodetail%2D826622%2Ehtml&urlid=0" target="_blank" mpid="5" style="padding: 0px; color: rgb(51, 51, 51); text-decoration: none;"><span style="padding: 0px; color: rgb(0, 0, 255); width: auto; height: auto;">mp3</span></a></span>"];
    NSURL *url = [NSURL fileURLWithPath:path];
    
    player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
    
    //声道 -1------左声道，1-----右声道
    player.pan = 0;
    
    //音量:0~1
    player.volume = 1;
    
    //单曲循环(负数表示单曲循环)
    player.numberOfLoops = -1;
    
    //速率（默认为1）
    //player.enableRate = YES;
    //player.rate = 1.0;
    
    //总时间
    CGFloat totalSeconds = player.duration;
    self.totalTimeLabel.text = [NSString stringWithFormat:@"%02d:%02d",(int)totalSeconds / 60, (int)totalSeconds % 60];
    
    //当前时间
    player.currentTime;
    
#if 0
    //播放
    [player play];
    
    //停止
    [player stop];
    
    //暂停
    [player pause];

#endif
    

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


- (IBAction)playBtnClick:(UIButton *)sender {
    
    sender.selected = !sender.selected;
    if (sender.selected) {
        [player prepareToPlay];
        [player play];
    }else{
        [player pause];
    }
}

- (IBAction)preMusicBtnClick:(id)sender {
    [self initPlayer];
}

- (IBAction)valueChange:(UISlider *)sender {
       player.currentTime = player.duration * sender.value;
}

- (IBAction)nextMusicBtnClick:(id)sender {
    [self initPlayer];
}

#pragma <span id="6_nwp" style="padding: 0px; width: auto; height: auto; float: none;"><a target=_blank id="6_nwl" href="http://cpro.baidu.com/cpro/ui/uijs.php?adclass=0&app_id=0&c=news&cf=1001&ch=0&di=128&fv=18&is_app=0&jk=e21eb48420ee3a55&k=mark&k0=mark&kdi0=0&luki=5&mcpm=0&n=10&p=baidu&q=65035100_cpr&rb=0&rs=1&seller_id=1&sid=553aee2084b41ee2&ssp2=1&stid=9&t=tpclicked3_hc&td=1836545&tu=u1836545&u=http%3A%2F%2Fwww%2Ebubuko%2Ecom%2Finfodetail%2D826622%2Ehtml&urlid=0" target="_blank" mpid="6" style="padding: 0px; color: rgb(51, 51, 51); text-decoration: none;"><span style="padding: 0px; color: rgb(0, 0, 255); width: auto; height: auto;">mark</span></a></span> - TableViewDelegate
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return lrc.wordArray.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"CELL"];
    
    if (indexPath.row == currentRow)
    {
        cell.textLabel.textColor = [UIColor <span id="7_nwp" style="padding: 0px; width: auto; height: auto; float: none;"><a target=_blank id="7_nwl" href="http://cpro.baidu.com/cpro/ui/uijs.php?adclass=0&app_id=0&c=news&cf=1001&ch=0&di=128&fv=18&is_app=0&jk=e21eb48420ee3a55&k=red&k0=red&kdi0=0&luki=7&mcpm=0&n=10&p=baidu&q=65035100_cpr&rb=0&rs=1&seller_id=1&sid=553aee2084b41ee2&ssp2=1&stid=9&t=tpclicked3_hc&td=1836545&tu=u1836545&u=http%3A%2F%2Fwww%2Ebubuko%2Ecom%2Finfodetail%2D826622%2Ehtml&urlid=0" target="_blank" mpid="7" style="padding: 0px; color: rgb(51, 51, 51); text-decoration: none;"><span style="padding: 0px; color: rgb(0, 0, 255); width: auto; height: auto;">red</span></a></span>Color];
    }
    else
    {
        cell.textLabel.textColor = [UIColor blackColor];
    }
    
    
    cell.textLabel.textAlignment = NSTextAlignmentCenter;
    
    cell.textLabel.font = [UIFont systemFontOfSize:15];
    
    cell.textLabel.text = lrc.wordArray[indexPath.row];
    
    return cell;
}

@end

需要音乐在程序进入后台后同样能够播放，那么在plist文件中，增加Required background modes设置item 0的value为App plays audio or streams audio/video using AirPlay

 

并在控制器中，添加后台播放音频的设置

 

    //后台播放音频设置
    AVAudioSession *session = [AVAudioSession sharedInstance];
    [session setActive:YES error:nil];
    [session setCategory:AVAudioSessionCategoryPlayback error:nil];
  
    //让app支持接受远程控制事件
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];