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 = 0;
    self.indexMusicList = 0;
    
    self.musicImg = [[UIImageView alloc]initWithFrame:CGRectMake(45, 54, 231, 231)];//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(0, 0, 320, 480)];//初始化背景
    [self.imageview setImage:[UIImage imageWithContentsOfFile:[[NSBundle mainBundle]pathForResource:@"bgimg.png" ofType:nil]]];
    self.imageview.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0];
    self.imageview.contentMode = UIViewContentModeScaleAspectFill;
    self.imageview.userInteractionEnabled = true;
    [self.view addSubview:self.imageview];
    
    self.slider = [[UISlider alloc]initWithFrame:CGRectMake(20, 340, 280, 10)];//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(0, 300, 320, 30)];//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(20, 360, 60, 30)];//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(240, 360, 60, 30)];//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(130, 400,60, 60)];//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(30, 400, 60, 60)];//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(230, 400, 60, 60)];//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 = 0;//歌词指示变0
    [self.player stop];//播放器停止
    self.player.currentTime = 0;//当前播放时间停止
    [self.timer invalidate];//timer 停止
    self.slider.value = 0;//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 == 0 ? self.indexMusicList = self.musicListArray.count - 1 : 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 - 1) ? (self.indexMusicList = 0) : 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 - 1]: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 = 0;//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-1>-1?self.indexLrc-1:0];//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