【代码笔记】看图听声音

一，效果图。

二，工程图。

三，代码。

RootViewController.h

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

@interface RootViewController : UIViewController <AVAudioPlayerDelegate> { UIImageView *backImageView; //播放器
    AVAudioPlayer *_audioPlayer; //图片名字数组
    NSMutableArray *pictureNameArray; //音乐名字数组
    NSMutableArray *musicNameArray; //播放到的下标索引
    int songIndex; //左侧按钮
    UIButton * leftButton; //右侧按钮
    UIButton * rightButton; //显示标题的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 = @"看图听声"; //初始化数据
 [self initData]; //初始化背景图
 [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:@"小鸡",@"小熊",@"小鸟",@"骆驼",@"小猫",@"奶牛",@"梅花鹿",@"小狗",@"海豚",@"毛驴",@"鸭子",@"大象",@"狐狸",@"青蛙",@"白鹅",@"小马",@"狮子",@"海鸟",@"猴子",@"小猪",@"绵羊",@"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]; //播放按钮
    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]; //标题
    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