轻仿QQ音乐之音频歌词播放、锁屏歌词-b

歌词播放界面



音乐播放界面



锁屏歌词界面

一. 项目概述

项目播放的mp3文件及lrc文件均来自QQ音乐

本文主要主要讲解锁屏歌词的实现，音频、歌词的播放网上资源略多，因此不做重点讲解，项目也是采取最简单的MVC+storyboard方式

项目GitHub地址： https://github.com/PengfeiWang666/WPFMusicPlayer
音乐模型-->WPFMusic

/** 图片 */
@property (nonatomic,copy) NSString *image;
/** 歌词 */
@property (nonatomic,copy) NSString *lrc;
/** 歌曲 */
@property (nonatomic,copy) NSString *mp3;
/** 歌曲名 */
@property (nonatomic,copy) NSString *name;
/** 歌手 */
@property (nonatomic,copy) NSString *singer;
/** 专辑 */
@property (nonatomic,copy) NSString *album;
/** 类型 */
@property (nonatomic,assign) WPFMusicType type;

音乐模型所对应的 plist 存储文件

歌词模型-->WPFLyric

/** 歌词开始时间 */
@property (nonatomic,assign) NSTimeInterval time;
/** 歌词内容 */
@property (nonatomic,copy) NSString *content;

歌词展示界面-->WPFLyricView

@property (nonatomic,weak) id <WPFLyricViewDelegate> delegate;
/** 歌词模型数组 */
@property (nonatomic,strong) NSArray *lyrics;
/** 每行歌词行高 */
@property (nonatomic,assign) NSInteger rowHeight;
/** 当前正在播放的歌词索引 */
@property (nonatomic,assign) NSInteger currentLyricIndex;
/** 歌曲播放进度 */
@property (nonatomic,assign) CGFloat lyricProgress;
/** 竖直滚动的view，即歌词View */
@property (nonatomic,weak) UIScrollView *vScrollerView;
#warning 以下为私有属性/* 水平滚动的大view，包含音乐播放界面及歌词界面 */
@property (nonatomic,weak) UIScrollView *hScrollerView;
/** 定位播放的View */
@property (nonatomic,weak) WPFSliderView *sliderView;

当前正在播放的歌词label-->WPFColorLabel

/** 歌词播放进度 */
@property (nonatomic,assign) CGFloat progress;
/** 歌词颜色 */
@property (nonatomic,strong) UIColor *currentColor;

播放管理对象-->WPFPlayManager

/** 单例分享 */
+ (instancetype)sharedPlayManager;
/**
*  播放音乐的方法  *
*  @param fileName 音乐文件的名称
*  @param complete 播放完毕后block回调
*/
- (void)playMusicWithFileName:(NSString *)fileName didComplete:(void(^)())complete;/** 音乐暂停 */- (void)pause;

歌词解析器-->WPFLyricParser (主要就是根据 .lrc 文件解析歌词的方法)

+ (NSArray *)parserLyricWithFileName:(NSString *)fileName {    // 根据文件名称获取文件地址
NSString *path = [[NSBundle mainBundle] pathForResource:fileName ofType:nil];    // 根据文件地址获取转化后的总体的字符串
NSString *lyricStr = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:NULL];    // 将歌词总体字符串按行拆分开，每句都作为一个数组元素存放到数组中
NSArray *lineStrs = [lyricStr componentsSeparatedByString:@"\n"];    // 设置歌词时间正则表达式格式
NSString *pattern = @"\\[[0-9]{2}:[0-9]{2}.[0-9]{2}\\]";    NSRegularExpression *reg = [NSRegularExpression regularExpressionWithPattern:pattern options:0 error:NULL];    // 创建可变数组存放歌词模型
NSMutableArray *lyrics = [NSMutableArray array];    // 遍历歌词字符串数组
for (NSString *lineStr in lineStrs) {
NSArray *results = [reg matchesInString:lineStr options:0 range:NSMakeRange(0, lineStr.length)];        // 歌词内容
NSTextCheckingResult *lastResult = [results lastObject];        NSString *content = [lineStr substringFromIndex:lastResult.range.location + lastResult.range.length];        // 每一个结果的range
for (NSTextCheckingResult *result in results) {            NSString *time = [lineStr substringWithRange:result.range];            #warning 对于类似 NSDateFormatter 的重大开小对象，最好使用单例管理
NSDateFormatter *formatter = [NSDateFormatter sharedDateFormatter];
formatter.dateFormat = @"[mm:ss.SS]";            NSDate *timeDate = [formatter dateFromString:time];            NSDate *initDate = [formatter dateFromString:@"[00:00.00]"];            // 创建模型
WPFLyric *lyric = [[WPFLyric alloc] init];
lyric.content = content;            // 歌词的开始时间
lyric.time = [timeDate timeIntervalSinceDate:initDate];            // 将歌词对象添加到模型数组汇总
[lyrics addObject:lyric];
}
}    // 按照时间正序排序
NSSortDescriptor *sortDes = [NSSortDescriptor sortDescriptorWithKey:@"time" ascending:YES];
[lyrics sortUsingDescriptors:@[sortDes]];
return lyrics;
}

二. 主要知识点讲解

音频播放AppDelegate中操作

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    // 注册后台播放
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayback error:NULL];    // 开启远程事件  -->自动切歌
[application beginReceivingRemoteControlEvents];
return YES;
}

音频播放加载文件播放方式

NSURL *url = [[NSBundle mainBundle] URLForResource:fileName withExtension:nil];AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:NULL];

在 ViewController 中点击事件

#warning 播放/暂停按钮点击事件
- (IBAction)play {
WPFPlayManager *playManager = [WPFPlayManager sharedPlayManager];
if (self.playBtn.selected == NO) {
[self startUpdateProgress];
WPFMusic *music = self.musics[self.currentMusicIndex];
[playManager playMusicWithFileName:music.mp3 didComplete:^{
[self next];
}];
self.playBtn.selected = YES;
}else{
self.playBtn.selected = NO;
[playManager pause];
[self stopUpdateProgress];
}
}
#warning 下一曲按钮点击事件
- (IBAction)next {    // 循环播放
if (self.currentMusicIndex == self.musics.count -1) {
self.currentMusicIndex = 0;
}else{
self.currentMusicIndex ++;
}
[self changeMusic];
}
#warning changeMusic 方法// 重置音乐对象，各种基础赋值

- (void)changeMusic {    // 防止切歌时歌词数组越界
self.currentLyricIndex = 0;    // 切歌时销毁当前的定时器
[self stopUpdateProgress];
WPFPlayManager *pm = [WPFPlayManager sharedPlayManager];
WPFMusic *music = self.musics[self.currentMusicIndex];    // 歌词
// 解析歌词
self.lyrics = [WPFLyricParser parserLyricWithFileName:music.lrc];    // 给竖直歌词赋值
self.lyricView.lyrics = self.lyrics;    // 专辑
self.albumLabel.text = music.album;    // 歌手
self.singerLabel.text = [NSString stringWithFormat:@"—  %@  —", music.singer];    // 图片
UIImage *image = [UIImage imageNamed:music.image];
self.vCenterImageView.image = image;
self.bgImageView.image = image;
self.hCennterImageView.image = image;
self.playBtn.selected = NO;
self.navigationItem.title = music.name;
[self play];
self.durationLabel.text = [WPFTimeTool stringWithTime:pm.duration];
}

三. 锁屏歌词详细讲解

更新锁屏界面的方法最好在一句歌词唱完之后的方法中调用(还是结合代码添加注释吧，干讲... 臣妾做不到啊)

- (void)updateLockScreen {
#warning 锁屏界面的一切信息都要通过这个原生的类来创建：MPNowPlayingInfoCenter
// 获取音乐播放信息中心
MPNowPlayingInfoCenter *nowPlayingInfoCenter = [MPNowPlayingInfoCenter defaultCenter];    // 创建可变字典存放信息
NSMutableDictionary *info = [NSMutableDictionary dictionary];    // 获取当前正在播放的音乐对象
WPFMusic *music = self.musics[self.currentMusicIndex];
WPFPlayManager *playManager = [WPFPlayManager sharedPlayManager];    // 专辑名称
info[MPMediaItemPropertyAlbumTitle] = music.album;    // 歌手
info[MPMediaItemPropertyArtist] = music.singer;    // 专辑图片
info[MPMediaItemPropertyArtwork] = [[MPMediaItemArtwork alloc] initWithImage:[self lyricImage]];    // 当前播放进度
info[MPNowPlayingInfoPropertyElapsedPlaybackTime] = @(playManager.currentTime);    // 音乐总时间
info[MPMediaItemPropertyPlaybackDuration] = @(playManager.duration);    // 音乐名称
info[MPMediaItemPropertyTitle] = music.name;
nowPlayingInfoCenter.nowPlayingInfo = info;
}

更新锁屏歌词的原理就是获取专辑图片后，将前后三句歌词渲染到图片上，使用富媒体将当前正在播放的歌词和前后的歌词区分开大小和颜色

- (UIImage *)lyricImage {
WPFMusic *music = self.musics[self.currentMusicIndex];
WPFLyric *lyric = self.lyrics[self.currentLyricIndex];
WPFLyric *lastLyric = [[WPFLyric alloc] init];
WPFLyric *nextLyric = [[WPFLyric alloc] init];
if (self.currentLyricIndex > 0) {
lastLyric = self.lyrics[self.currentLyricIndex - 1];
if (!lastLyric.content.length && self.currentLyricIndex > 1) {
lastLyric = self.lyrics[self.currentLyricIndex - 2];         }     }
if (self.lyrics.count > self.currentLyricIndex + 1) {
nextLyric = self.lyrics[self.currentLyricIndex + 1];        // 筛选空的时间间隔歌词
if (!nextLyric.content.length && self.lyrics.count > self.currentLyricIndex + 2) {
nextLyric = self.lyrics[self.currentLyricIndex + 2];
}
}
UIImage *bgImage = [UIImage imageNamed:music.image];    // 创建ImageView
UIImageView *imgView = [[UIImageView alloc] initWithImage:bgImage];
imgView.bounds = CGRectMake(0, 0, 640, 640);
imgView.contentMode = UIViewContentModeScaleAspectFill;    // 添加遮罩
UIView *cover = [[UIView alloc] initWithFrame:imgView.bounds];
cover.backgroundColor = [UIColor colorWithWhite:0 alpha:0.3];
[imgView addSubview:cover];    // 添加歌词
UILabel *lyricLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 480, 620, 150)];
lyricLabel.textAlignment = NSTextAlignmentCenter;
lyricLabel.numberOfLines = 3;

NSString *lyricString = [NSString stringWithFormat:@"%@ \n%@ \n %@", lastLyric.content, lyric.content, nextLyric.content];
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:lyricString attributes:@{
NSFontAttributeName : [UIFont systemFontOfSize:29],
NSForegroundColorAttributeName : [UIColor lightGrayColor]                                                 }];
[attributedString addAttributes:@{
NSFontAttributeName : [UIFont systemFontOfSize:34],
NSForegroundColorAttributeName : [UIColor whiteColor]                                     } range:[lyricString rangeOfString:lyric.content]];
lyricLabel.attributedText = attributedString;
[imgView addSubview:lyricLabel];    // 开始画图
UIGraphicsBeginImageContext(imgView.frame.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[imgView.layer renderInContext:context];    // 获取图片
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();    // 结束上下文
UIGraphicsEndImageContext();
return img;
}

当然不是所有的时候都要去更新锁屏多媒体信息的，可以采用下面的方法进行监听优化：只在锁屏而且屏幕亮着的时候才会去设置，啥都不说了，都在代码里了

#warning 声明的全局变量及通知名称
static uint64_t isScreenBright;static uint64_t isLocked;
#define kSetLockScreenLrcNoti @"kSetLockScreenLrcNoti"
#warning 在 viewDidLoad 方法中监听     // 监听锁屏状态     static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), NULL, updateEnabled, CFSTR("com.apple.iokit.hid.displayStatus"), NULL, CFNotificationSuspensionBehaviorDeliverImmediately);   CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), NULL, lockState, CFSTR("com.apple.springboard.lockstate"), NULL, CFNotificationSuspensionBehaviorDeliverImmediately);
});
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(updateLockScreen) name:kSetLockScreenLrcNoti object:nil];

上面两个监听对应的方法：

// 监听在锁定状态下，屏幕是黑暗状态还是明亮状态
static void updateEnabled(CFNotificationCenterRef center, void* observer, CFStringRef name, const void* object, CFDictionaryRef userInfo) {    //    uint64_t state;
int token;
notify_register_check("com.apple.iokit.hid.displayStatus", &token);
notify_get_state(token, &isScreenBright);
notify_cancel(token);
[ViewController checkoutIfSetLrc];    //    NSLog(@"锁屏状态：%llu",isScreenBright);}// 监听屏幕是否被锁定static void lockState(CFNotificationCenterRef center, void* observer, CFStringRef name, const void* object, CFDictionaryRef userInfo) {      uint64_t state;    int token;      notify_register_check("com.apple.springboard.lockstate", &token);      notify_get_state(token, &state);      notify_cancel(token);
isLocked = state;
[ViewController checkoutIfSetLrc];    //    NSLog(@"lockState状态：%llu",state);}#warning 这个方法不太好，有好想法的可在评论区讨论+ (void)checkoutIfSetLrc {    // 如果当前屏幕被锁定 && 屏幕处于 active 状态，就发送通知调用对象方法
if (isLocked && isScreenBright) {
[[NSNotificationCenter defaultCenter] postNotificationName:kSetLockScreenLrcNoti object:nil];
}
}

雾化:

- (UIImage *)blur:(CGFloat)radius
{
CIContext *context = [CIContext contextWithOptions:nil];
CIImage *inputImage = [[CIImage alloc] initWithImage:self];
// create blur filter
CIFilter *filter = [CIFilter filterWithName:@"CIGaussianBlur"];
[filter setValue:inputImage forKey:kCIInputImageKey];
[filter setValue:[NSNumber numberWithFloat:radius] forKey:@"inputRadius"];
// blur image
CIImage *result = [filter valueForKey:kCIOutputImageKey];
float insert = 60;
CGRect extent = CGRectInset(filter.outputImage.extent, insert, insert);
CGImageRef cgImage = [context createCGImage:result fromRect:extent];
UIImage *image = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);

return image;
}

- (UIImage *)blur
{
return [self blur:9.0f];
}

-(void)asyncApplyBlur:(UIImageAsyncBlurBlock)block
{
__weak typeof(self) wself = self;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

UIImage *blueImage = [wself blur
];
dispatch_async(dispatch_get_main_queue(), ^{
block(blueImage);
});
//        block([wself blur]);
});
}