2021-03-24

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：

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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

<pre name="code" class="objc prettyprint prettyprinted" style="box-sizing: border-box; overflow: auto; font-family: Menlo, Monaco, Consolas, "Courier New", monospace; font-size: 13px; display: block; padding: 10px; margin: 0px 0px 10px; line-height: 1.42857; color: rgb(51, 51, 51); word-break: break-all; overflow-wrap: break-word; background-color: rgb(247, 247, 249); border: none; border-radius: 4px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">#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</pre>

ZMPlrc.m

<pre name="code" class="objc prettyprint prettyprinted" style="box-sizing: border-box; overflow: auto; font-family: Menlo, Monaco, Consolas, "Courier New", monospace; font-size: 13px; display: block; padding: 10px; margin: 0px 0px 10px; line-height: 1.42857; color: rgb(51, 51, 51); word-break: break-all; overflow-wrap: break-word; background-color: rgb(247, 247, 249); border: none; border-radius: 4px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">#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</pre>

接着，在storyboard中添加必要的控件。

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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

<pre name="code" class="objc prettyprint prettyprinted" style="box-sizing: border-box; overflow: auto; font-family: Menlo, Monaco, Consolas, "Courier New", monospace; font-size: 13px; display: block; padding: 10px; margin: 0px 0px 10px; line-height: 1.42857; color: rgb(51, 51, 51); word-break: break-all; overflow-wrap: break-word; background-color: rgb(247, 247, 249); border: none; border-radius: 4px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">#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</pre>

ZMPViewController.m

<pre name="code" class="objc prettyprint prettyprinted" style="box-sizing: border-box; overflow: auto; font-family: Menlo, Monaco, Consolas, "Courier New", monospace; font-size: 13px; display: block; padding: 10px; margin: 0px 0px 10px; line-height: 1.42857; color: rgb(51, 51, 51); word-break: break-all; overflow-wrap: break-word; background-color: rgb(247, 247, 249); border: none; border-radius: 4px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">#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 from a nib. [self initPlayer]; //侦听当前时间 [NSTimer scheduledTimerWithTimeInterval:0.5 target: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app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:@"mp3"]; 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 mark - 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 redColor]; } 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</pre>

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

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并在控制器中，添加后台播放音频的设置

<pre name="code" class="objc prettyprint prettyprinted" style="box-sizing: border-box; overflow: auto; font-family: Menlo, Monaco, Consolas, "Courier New", monospace; font-size: 13px; display: block; padding: 10px; margin: 0px 0px 10px; line-height: 1.42857; color: rgb(51, 51, 51); word-break: break-all; overflow-wrap: break-word; background-color: rgb(247, 247, 249); border: none; border-radius: 4px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">//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];</pre>

另外，需要Demo的可以留言。