【代碼筆記】看圖聽聲音

一，效果圖。

二，工程圖。

三，代碼。

RootViewController.h

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>

@interface RootViewController : UIViewController
<AVAudioPlayerDelegate>
{
    UIImageView *backImageView;
    //播放器
    AVAudioPlayer *_audioPlayer;
    //圖片名字數組
    NSMutableArray *pictureNameArray;
    //音樂名字數組
    NSMutableArray *musicNameArray;
    //播放到的下標索引
    int songIndex;
    //左側按鈕
    UIButton * leftButton;
    //右側按鈕
    UIButton * rightButton;
    //顯示標題的label
    UILabel *titleLabel;
    
}
@end

RootViewController.m

#import "RootViewController.h"

@interface RootViewController ()

@end

@implementation RootViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.title = @"看圖聽聲";
    
    //初始化數據
    [self initData];
    //初始化背景圖
    [self initBackGroundView];
}
#pragma -mark -functions
-(void)initData{
    
    pictureNameArray=[[NSMutableArray alloc]initWithObjects:@"chicken",@"bear",@"bird",@"camel",@"cat",@"cattle",@"deer",@"dog",@"dolphin",@"donkey",@"duck",@"elephant",@"fox",@"frog",@"goose",@"horse",@"lion",@"mew",@"monkey",@"pig",@"sheep",@"snake",@"tiger",@"wolf", nil];
    
    
    musicNameArray=[[NSMutableArray alloc]initWithObjects:@"小雞",@"小熊",@"小鳥",@"駱駝",@"小貓",@"奶牛",@"梅花鹿",@"小狗",@"海豚",@"毛驢",@"鴨子",@"大象",@"狐狸",@"青蛙",@"白鵝",@"小馬",@"獅子",@"海鳥",@"猴子",@"小豬",@"綿羊",@"小蛇",@"老虎",@"小狼", nil];
}

-(void)loadMusic:(NSString*)name type:(NSString*)type
{
    NSString* path= [[NSBundle mainBundle] pathForResource: name ofType:type];
    NSURL* url = [NSURL fileURLWithPath:path];
    _audioPlayer= [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
    _audioPlayer.delegate=self;
    _audioPlayer.volume= 0.5;
    [_audioPlayer prepareToPlay];
    
}

-(void)initBackGroundView
{
    backImageView= [[UIImageView alloc] initWithFrame: CGRectMake(0, 0, 320, 460)];
    backImageView.image= [UIImage imageNamed:[NSString stringWithFormat:@"%@.jpg",[pictureNameArray objectAtIndex:songIndex]]];
    [self.view addSubview:backImageView];
    
    //播放按鈕
    UIButton* button= [UIButton buttonWithType:UIButtonTypeCustom];
    button.tag=100;
    button.frame=CGRectMake(130, 310, 60, 50);
    [button addTarget:self action:@selector(play:) forControlEvents:UIControlEventTouchUpInside];
    [button setImage:[UIImage imageNamed:@"play.png"] forState:UIControlStateNormal];
    [self.view addSubview:button];
    
    //上一首
    leftButton= [UIButton buttonWithType:UIButtonTypeCustom];
    leftButton.frame=CGRectMake(30, 310, 60, 50);
    [leftButton addTarget:self action:@selector(prier) forControlEvents:UIControlEventTouchUpInside];
    [leftButton setImage:[UIImage imageNamed:@"Left.png"] forState:UIControlStateNormal];
    [self.view addSubview:leftButton];
    
    
    //下一首
    rightButton= [UIButton buttonWithType:UIButtonTypeCustom];
    rightButton.frame=CGRectMake(230, 310, 60, 50);
    [rightButton addTarget:self action:@selector(next) forControlEvents:UIControlEventTouchUpInside];
    [rightButton setImage:[UIImage imageNamed:@"right.png"] forState:UIControlStateNormal];
    [self.view addSubview:rightButton];
    
    
    //標題
    titleLabel= [[UILabel alloc] initWithFrame:CGRectMake(0, 290, 320, 30)];
    titleLabel.font= [UIFont systemFontOfSize:25];
    titleLabel.textAlignment= NSTextAlignmentCenter;
    titleLabel.textColor= [UIColor blueColor];
    titleLabel.numberOfLines=0;
    titleLabel.text= [musicNameArray objectAtIndex:0];
    [self.view addSubview:titleLabel];
    
    [self loadMusic:[pictureNameArray objectAtIndex:0] type:@"mp3"];
    
}

-(void)setBackground:(UIImage *)image
{
    backImageView.image = image;
    
}

#pragma -mark -doClickActions
//播放
-(void)play:(UIButton*)button
{
    if(_audioPlayer.playing)
    {
        [button setImage:[UIImage imageNamed:@"play.png"] forState:UIControlStateNormal];
        [_audioPlayer pause];
    }
    else
    {
        [button setImage:[UIImage imageNamed:@"stop.png"] forState:UIControlStateNormal];
        [_audioPlayer play];
    }
    
}
//上一首
-(void)prier
{
    BOOL playFlag;
    if(_audioPlayer.playing)
    {
        playFlag=YES;
        [_audioPlayer stop];
    }
    else
    {
        playFlag=NO;
    }
    songIndex--;
    if(songIndex<0)
        songIndex= pictureNameArray.count-1
        ;
    
    UIButton * button = (UIButton*)[self.view viewWithTag:100];
    [button setImage:[UIImage imageNamed:@"play.png"] forState:UIControlStateNormal];
    [self loadMusic:[pictureNameArray objectAtIndex:songIndex] type:@"mp3"];
    
    UIImage * image = [UIImage imageNamed:[NSString stringWithFormat:@"%@.jpg",[pictureNameArray objectAtIndex:songIndex]]];
    [self setBackground:image];
    titleLabel.text= [musicNameArray objectAtIndex:songIndex];
    
    if(playFlag==YES)
    {
        [_audioPlayer play];
    }
    
}
//下一首
-(void)next
{
    BOOL playFlag;
    if(_audioPlayer.playing)
    {
        playFlag=YES;
        [_audioPlayer stop];
    }
    else{
        playFlag=NO;
    }
    songIndex++;
    if(songIndex==pictureNameArray.count){
        songIndex= 0;
    }
    
    
    UIButton * button = (UIButton*)[self.view viewWithTag:100];
    [button setImage:[UIImage imageNamed:@"play.png"] forState:UIControlStateNormal];
    [self loadMusic:[pictureNameArray objectAtIndex:songIndex] type:@"mp3"];
    
    UIImage * image = [UIImage imageNamed:[NSString stringWithFormat:@"%@.jpg",[pictureNameArray objectAtIndex:songIndex]]];
    [self setBackground:image];
    
    titleLabel.text= [musicNameArray objectAtIndex:songIndex];
    if(playFlag==YES)
    {
        [_audioPlayer play];
        
    }
 }


@end