ios开发学习- 简易音乐播放器2 （基于iPhone4s屏幕尺寸）-- 歌词解析--plist文件应用--imageNamed图片加载耗内存

声明：（部分图片来自网络，如果侵犯了您的权益请联系我，会尽快删除！）

又是音乐播放器，不过这次和上次不一样了，准确说这次更像播放器了，初学者不建议看这个，可以先看前面一个音乐播放器（1），当然 我没加1，写了这个，就把前面的默认当1吧

先上图：

接下来源码：（一样:大量的三元式，多看看就习惯了，主要是习惯一行能干的事绝不用两行）；

 //
 //  ViewController.m
 //  C_MusicPlayer
 //
 //  Created by Ibokan on 15/8/22.
 //  Copyright (c) 2015年 Crazy凡. All rights reserved.
 //

 #import "ViewController.h"
 #import <AVFoundation/AVFoundation.h>
 #import "LyricsAnalysis.h"

 @interface ViewController () <AVAudioPlayerDelegate>
 @property (nonatomic,strong)UIImageView *imageview;//bgimg
 @property (nonatomic,strong)UISlider *slider;//播放进度条
 @property (nonatomic,strong)UILabel *tlableall;//音乐总时长
 @property (nonatomic,strong)UILabel *tlablecur;//音乐当前播放时长
 @property (nonatomic,strong)UILabel *labellrc;//歌词显示label

 @property (nonatomic,strong)UIButton *buttonPlayandPause;
 @property (nonatomic,strong)UIButton *buttonPrevious;
 @property (nonatomic,strong)UIButton *buttonNext;
 @property (nonatomic,strong)AVAudioPlayer *player;
 @property (nonatomic,strong)LyricsAnalysis *lrc;
 @property (nonatomic,strong)UIImageView *musicImg;
 @property (nonatomic,strong)NSTimer *timer;//计时器
 @property (nonatomic,strong)NSMutableArray *musicListArray;//歌曲列表

 @property int indexLrc;//歌词播放指向
 @property int indexMusicList;//歌曲播放指向

 //@property (nonatomic,strong)UIScrollView * scrollview;
 @end

 @implementation ViewController

 - (NSArray *)musicListArray//初始化歌曲列表  :  懒加载
 {
     if(!_musicListArray)
     {
         _musicListArray = [NSMutableArray arrayWithArray:[NSArray arrayWithContentsOfFile:[[NSBundle mainBundle]pathForResource:@"Music.plist" ofType:nil]]];
         for(NSDictionary *temp in _musicListArray)//屏蔽无效路径
         {
             [[NSBundle mainBundle]pathForResource:[temp valueForKey:@"music"]  ofType:nil] ? nil:[_musicListArray removeObject:temp];
         }
     }
     return _musicListArray;
 }

 - (void)viewDidLoad {
     [super viewDidLoad];
     // Do any additional setup after loading the view, typically from a nib.

     self.indexLrc = ;
     self.indexMusicList = ;

     self.musicImg = [[UIImageView alloc]initWithFrame:CGRectMake(, , , )];//初始化歌曲图片
     self.musicImg.backgroundColor = [UIColor groupTableViewBackgroundColor];
     self.musicImg.contentMode = UIViewContentModeScaleAspectFill;
     [self.view addSubview:self.musicImg];

     self.imageview = [[UIImageView alloc]initWithFrame:CGRectMake(, , , )];//初始化背景
     [self.imageview setImage:[UIImage imageWithContentsOfFile:[[NSBundle mainBundle]pathForResource:@"bgimg.png" ofType:nil]]];
     self.imageview.backgroundColor = [UIColor colorWithRed: green: blue: alpha:];
     self.imageview.contentMode = UIViewContentModeScaleAspectFill;
     self.imageview.userInteractionEnabled = true;
     [self.view addSubview:self.imageview];

     self.slider = [[UISlider alloc]initWithFrame:CGRectMake(, , , )];//初始化进度条
     self.slider.value = 0.0;
     [self.view addSubview:self.slider];
     [self.slider addTarget:self action:@selector(updateValue) forControlEvents:UIControlEventValueChanged];

     self.labellrc = [[UILabel alloc]initWithFrame:CGRectMake(, , , )];//初始化歌词显示label
     self.labellrc.textColor = [UIColor whiteColor];
     self.labellrc.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.2];
     self.labellrc.textAlignment = NSTextAlignmentCenter;
     [self.view addSubview:self.labellrc];

     self.tlablecur = [[UILabel alloc]initWithFrame:CGRectMake(, , , )];//初始化当前播放时间显示label
     self.tlablecur.textColor = [UIColor whiteColor];
     self.tlablecur.text = @"00:00";
     self.tlablecur.textAlignment = NSTextAlignmentCenter;
     [self.view addSubview:self.tlablecur];

     self.tlableall = [[UILabel alloc]initWithFrame:CGRectMake(, , , )];//初始化音乐总时间显示label
     self.tlableall.textColor = [UIColor whiteColor];
     self.tlableall.textAlignment = NSTextAlignmentCenter;
     [self.view addSubview:self.tlableall];

     self.buttonPlayandPause = [[UIButton alloc]initWithFrame:CGRectMake(, ,, )];//初始化并插入开始and暂停按钮
     [self.view addSubview:self.buttonPlayandPause];
     [self.buttonPlayandPause setBackgroundImage:[UIImage imageNamed:@"start.png"] forState:UIControlStateNormal];
     [self.buttonPlayandPause addTarget:self action:@selector(startandpause) forControlEvents:UIControlEventTouchUpInside];

     self.buttonPrevious = [[UIButton alloc]initWithFrame:CGRectMake(, , , )];//初始化并插入上一曲按钮
     [self.view addSubview:self.buttonPrevious];
     [self.buttonPrevious setBackgroundImage:[UIImage imageNamed:@"previous.png"] forState:UIControlStateNormal];
     [self.buttonPrevious addTarget:self action:@selector(previous) forControlEvents:UIControlEventTouchUpInside];

     self.buttonNext = [[UIButton alloc]initWithFrame:CGRectMake(, , , )];//初始化并插入下一曲按钮
     [self.view addSubview:self.buttonNext];
     [self.buttonNext setBackgroundImage:[UIImage imageNamed:@"next.png"] forState:UIControlStateNormal];
     [self.buttonNext addTarget:self action:@selector(next) forControlEvents:UIControlEventTouchUpInside];

     [self addSource];//歌词 歌曲 图片 初始化
 }
 - (void)startandpause//设置按钮选项
 {
     if([self.player isPlaying])
     {
         [self.timer invalidate];
         [self.player pause];
         [self.buttonPlayandPause setBackgroundImage:[UIImage imageNamed:@"start.png"] forState:UIControlStateNormal];
     }
     else
     {
         [self.player play];
         [self.buttonPlayandPause setBackgroundImage:[UIImage imageNamed:@"pause.png"] forState:UIControlStateNormal];
         self.timer = [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(timeadd) userInfo:nil repeats:YES];
         self.timer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(rotate) userInfo:nil repeats:YES];
     }
 }
 - (void)playerclear//停止  管理所有的清零事件
 {
     self.indexLrc = ;//歌词指示变0
     [self.player stop];//播放器停止
     self.player.currentTime = ;//当前播放时间停止
     [self.timer invalidate];//timer 停止
     self.slider.value = ;//进度条清零
     self.tlablecur.text = @"00:00";
     self.labellrc.text = [NSString stringWithFormat:@"%@ : %@",self.lrc.ar,self.lrc.ti]; //歌词显示成标题+作者
 }
 - (void)addSource//更改歌曲资源
 {
     self.player= [[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL fileURLWithPath: [[NSBundle mainBundle]pathForResource:[[self.musicListArray objectAtIndex:self.indexMusicList]valueForKey:@"music"] ofType:nil]]error:nil];//歌曲初始化
     if(self.player == nil) //防止加载不到音乐文件
     {
         [self next] ;
         return;
     }
     self.player.delegate = self;//设置委托回调
     self.lrc = [[LyricsAnalysis alloc]initWithFileName:[[self.musicListArray objectAtIndex:self.indexMusicList]valueForKey:@"lyrics"] ofType:nil];//歌词初始化
     NSString *imgUrlTemp = [[NSBundle mainBundle]pathForResource:[[self.musicListArray objectAtIndex:self.indexMusicList]valueForKey:@"picture"]ofType:nil];//检查图片路径
     [self.musicImg setImage:[UIImage imageWithContentsOfFile:(imgUrlTemp ? imgUrlTemp : [[NSBundle mainBundle]pathForResource:@"noImg.png" ofType:nil])]];//设置图片
     NSDateFormatter *formatter = [[NSDateFormatter alloc]init];//设置总时间
     [formatter setDateFormat:@"mm:ss"];
     self.tlableall.text = [formatter stringFromDate:[NSDate dateWithTimeIntervalSince1970:self.player.duration]];
     self.labellrc.text = [NSString stringWithFormat:@"%@ - %@", self.lrc.ti , self.lrc.ar];//设置第一句歌词
 }
 - (void)previous//上一首
 {
     self.indexMusicList ==  ? self.indexMusicList = self.musicListArray.count -  : self.indexMusicList-- ;//第一首自动切换到最后一首
     [self playerclear];
     [self addSource];
     [self startandpause];
 }
 - (void)next//下一首
 {
     self.indexMusicList == (self.musicListArray.count - ) ? (self.indexMusicList = ) : self.indexMusicList++;//最后一首自动切换到第一首
     [self playerclear];
     [self addSource];
     [self startandpause];
 }
 - (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag//播放结束后  播放下一首
 {
         flag ? [self next]:nil;
 }
 - (void)timeadd//更新滚动条
 {
     self.slider.value = self.player.currentTime/self.player.duration;//进度条工作
     [self setTLableCur];
     self.indexLrc == self.lrc.lrcArrayTime.count ? self.labellrc.text = self.lrc.lrcArrayStr[self.indexLrc - ]:fabs([self.lrc.lrcArrayTime[self.indexLrc] doubleValue] - self.player.currentTime) < 0.06?self.labellrc.text = self.lrc.lrcArrayStr[self.indexLrc++]:nil;  //判断歌词是不是全部播放完了，是就显示:最后一句歌词 不是 就判断是不是有哪句歌词是当前应该播放的（时间差小于0.05s）有就设置播放，没有就不做任何处理
 }
 -(void)rotate//图片旋转
 {
     CGAffineTransform t=CGAffineTransformRotate(self.musicImg.transform, 0.01);
     self.musicImg.transform=t;
 }
 - (void)updateValue//拖动进度条动作
 {
     self.player.currentTime = self.player.duration * self.slider.value;
     [self setTLableCur];
     self.indexLrc = ;//歌词数组遍历完成了 或者  当前指向的歌词的播放时间 比  当前歌曲播放时间大；就跳出循环
     while(self.indexLrc != self.lrc.lrcArrayTime.count && [self.lrc.lrcArrayTime[self.indexLrc] doubleValue] < self.player.currentTime)
     {
         self.indexLrc++;
     }
     self.labellrc.text = self.lrc.lrcArrayStr[self.indexLrc->-?self.indexLrc-:];//跳出循环的 就播放当前指向的前一句歌词
 }
 - (void)setTLableCur//设置当前播放时间
 {
     NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
     [formatter setDateFormat:@"mm:ss"]; //格式化时间配置
     self.tlablecur.text = [formatter stringFromDate:[NSDate dateWithTimeIntervalSince1970:self.player.currentTime]]; //设置显示时间
 }
 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }
 @end

知识点解析：

1、

#import "LyricsAnalysis.h"

自己手写的歌词解析类，可以查看我的上一篇博客去看看实现，记得按照下面的更新更新类里面的修改部分；

2、懒加载，用了下，感觉还行，具体的不会细讲，反正就是一种不用你管的自动运行的机制，想详细了解的同学，自己看，我只是声明下，以免有没见过的看见不认识，

3、

CGAffineTransform t=CGAffineTransformRotate(self.musicImg.transform, 0.01);

self.musicImg.transform=t;

实现图片旋转，系统提供的类，

4、图片遮盖实现免切图的圆形；

音乐播放的时候的图片，切图太麻烦，巧妙地利用背景图，将背景图置于歌曲专辑图的上方，留下一块圆形空白，于是看到的就是圆形图片了，很容易理解的逻辑

5、歌词匹配的基本原理，是歌词应该播放的时间与当前歌曲播放的时间的差的绝对值足够小

6、拖动进度条歌词从第一句开始匹配，一直找到适当的位置为止，

7、plist  文件应用。

由于博客园上传文件大小限制，此处连接为百度云盘连接  不保证持续有效

点我下载源码