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="/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="/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="/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="/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:0~1player.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="/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="/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Requiredbackground modes设置item 0的value为App plays audio or streams audio/videousing 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];
