ios小案例：看图记字母（简单动画）

一、项目效果：

 

 点击字母，字母有动画效果，并且发音

二、用到的主要知识

1.产生动画（NSTimer计时器）

2.声音 AVFoundation.framework

 三、新建项目，主页面设计如图

 

四、控制器实现

1.声明代码

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>//导入播放音频框架

@interface HomeViewController : UIViewController
{
    IBOutlet UIScrollView *myScrollView;
    IBOutlet UIButton *buttonA;
    IBOutlet UIButton *buttonB;
    IBOutlet UIButton *buttonC;
    IBOutlet UIButton *buttonD;
    IBOutlet UIButton *buttonE;
    IBOutlet UIButton *buttonF;
    IBOutlet UIButton *buttonG;
    IBOutlet UIButton *buttonH;
    IBOutlet UIButton *buttonI;
    IBOutlet UIButton *buttonJ;
    IBOutlet UIButton *buttonK;
    IBOutlet UIButton *buttonL;
    IBOutlet UIButton *buttonM;
    IBOutlet UIButton *buttonN;
    IBOutlet UIButton *buttonO;
    IBOutlet UIButton *buttonP;
    IBOutlet UIButton *buttonQ;
    IBOutlet UIButton *buttonR;
    IBOutlet UIButton *buttonS;
    IBOutlet UIButton *buttonT;
    IBOutlet UIButton *buttonU;
    IBOutlet UIButton *buttonV;
    IBOutlet UIButton *buttonW;
    IBOutlet UIButton *buttonX;
    IBOutlet UIButton *buttonY;
    IBOutlet UIButton *buttonZ;
    
    AVAudioPlayer *audioPlayer;
    NSTimer *animationTimer;
    int flag;//标记点到的字母
    
}
//字母的点击事件
- (IBAction)touchA;
- (IBAction)touchB;
- (IBAction)touchC;
- (IBAction)touchD;
- (IBAction)touchE;
- (IBAction)touchF;
- (IBAction)touchG;
- (IBAction)touchH;
- (IBAction)touchI;
- (IBAction)touchJ;
- (IBAction)touchK;
- (IBAction)touchL;
- (IBAction)touchM;
- (IBAction)touchN;
- (IBAction)touchO;
- (IBAction)touchP;
- (IBAction)touchQ;
- (IBAction)touchR;
- (IBAction)touchS;
- (IBAction)touchT;
- (IBAction)touchU;
- (IBAction)touchV;
- (IBAction)touchW;
- (IBAction)touchX;
- (IBAction)touchY;
- (IBAction)touchZ;

- (void)initAudio:(NSString *)string;//初始化声音
- (void)doTimer;//开始计时器
@end 

 2.实现代码

  业务逻辑：点击字母时，判断audioPlayer是否为nil。如果是，就给flag赋值，它的值用来标记所点击的字母。然后执行initAudio方法（用于初始化要播放的声音文件）。由于这个操作是点击字母A的时候发生的，而声音文件名为“A”，所以将initAudio方法的参数设为“A”。

#import"HomeViewController.h"

@interface HomeViewController ()

@end

@implementation HomeViewController

- (IBAction)touchA
{
    if (audioPlayer == nil) {
        flag = 1;
        [self initAudio:@"A"];
    }
}
- (IBAction)touchB
{
    if (audioPlayer == nil) {
        flag = 2;
        [self initAudio:@"B"];
    }
}
- (IBAction)touchC
{
    if (audioPlayer == nil) {
        flag = 3;
        [self initAudio:@"C"];
    }
}
- (IBAction)touchD
{
    if (audioPlayer == nil) {
        flag = 4;
        [self initAudio:@"D"];
    }
}
- (IBAction)touchE
{
    if (audioPlayer == nil) {
        flag = 5;
        [self initAudio:@"E"];
    }
}
- (IBAction)touchF
{
    if (audioPlayer == nil) {
        flag = 6;
        [self initAudio:@"F"];
    }
}
- (IBAction)touchG
{
    if (audioPlayer == nil) {
        flag = 7;
        [self initAudio:@"G"];
    }
}
- (IBAction)touchH
{
    if (audioPlayer == nil) {
        flag = 8;
        [self initAudio:@"H"];
    }
}
- (IBAction)touchI
{
    if (audioPlayer == nil) {
        flag = 9;
        [self initAudio:@"I"];
    }
}
- (IBAction)touchJ
{
    if (audioPlayer == nil) {
        flag = 10;
        [self initAudio:@"J"];
    }
}
- (IBAction)touchK
{
    if (audioPlayer == nil) {
        flag = 11;
        [self initAudio:@"K"];
    }
}
- (IBAction)touchL
{
    if (audioPlayer == nil) {
        flag = 12;
        [self initAudio:@"L"];
    }
}
- (IBAction)touchM
{
    if (audioPlayer == nil) {
        flag = 13;
        [self initAudio:@"M"];
    }
}
- (IBAction)touchN
{
    if (audioPlayer == nil) {
        flag = 14;
        [self initAudio:@"N"];
    }
}
- (IBAction)touchO
{
    if (audioPlayer == nil) {
        flag = 15;
        [self initAudio:@"O"];
    }
}
- (IBAction)touchP
{
    if (audioPlayer == nil) {
        flag = 16;
        [self initAudio:@"P"];
    }
}
- (IBAction)touchQ
{
    if (audioPlayer == nil) {
        flag = 17;
        [self initAudio:@"Q"];
    }
}
- (IBAction)touchR
{
    if (audioPlayer == nil) {
        flag = 18;
        [self initAudio:@"R"];
    }
}
- (IBAction)touchS
{
    if (audioPlayer == nil) {
        flag = 19;
        [self initAudio:@"S"];
    }
}
- (IBAction)touchT
{
    if (audioPlayer == nil) {
        flag = 20;
        [self initAudio:@"T"];
    }
}
- (IBAction)touchU
{
    if (audioPlayer == nil) {
        flag = 21;
        [self initAudio:@"U"];
    }
}
- (IBAction)touchV
{
    if (audioPlayer == nil) {
        flag = 22;
        [self initAudio:@"V"];
    }
}
- (IBAction)touchW
{
    if (audioPlayer == nil) {
        flag = 23;
        [self initAudio:@"W"];
    }
}
- (IBAction)touchX
{
    if (audioPlayer == nil) {
        flag = 24;
        [self initAudio:@"X"];
    }
}
- (IBAction)touchY
{
    if (audioPlayer == nil) {
        flag = 25;
        [self initAudio:@"Y"];
    }
}
- (IBAction)touchZ
{
    if (audioPlayer == nil) {
        flag = 26;
        [self initAudio:@"Z"];
    }
}

- (void)initAudio:(NSString *)string
{
    NSURL *fileURL = [[NSURL alloc] initFileURLWithPath:[[NSBundle mainBundle] pathForResource:string ofType:@"wav"]];
    audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:nil];
    [audioPlayer play];
    [self doTimer];
    [fileURL release];
    
}

- (void)doTimer
{

    //每隔0.25s就调用一次类中的doAnimation方法，用于实现字母的闪烁效果 

    animationTimer = [NSTimer scheduledTimerWithTimeInterval:0.25 target:self selector:@selector(doAnimation) userInfo:nil repeats:YES];
}

- (void)doAnimation
{
    static int n = 0;
    if (audioPlayer.playing == YES)
    {
        switch (flag) 
        {
            case 1:
                if (n%2 == 0)
                {
                    buttonA.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonA.highlighted = NO;
                    n--;
                }
                break;
            case 2:
                if (n%2 == 0)
                {
                    buttonB.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonB.highlighted = NO;
                    n--;
                }
                break;
            case 3:
                if (n%2 == 0)
                {
                    buttonC.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonC.highlighted = NO;
                    n--;
                }
                break;
            case 4:
                if (n%2 == 0)
                {
                    buttonD.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonD.highlighted = NO;
                    n--;
                }
                break;
            case 5:
                if (n%2 == 0)
                {
                    buttonE.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonE.highlighted = NO;
                    n--;
                }
                break;
            case 6:
                if (n%2 == 0)
                {
                    buttonF.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonF.highlighted = NO;
                    n--;
                }
                break;
            case 7:
                if (n%2 == 0)
                {
                    buttonG.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonG.highlighted = NO;
                    n--;
                }
                break;
            case 8:
                if (n%2 == 0)
                {
                    buttonH.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonH.highlighted = NO;
                    n--;
                }
                break;
            case 9:
                if (n%2 == 0)
                {
                    buttonI.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonI.highlighted = NO;
                    n--;
                }
                break;
            case 10:
                if (n%2 == 0)
                {
                    buttonJ.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonJ.highlighted = NO;
                    n--;
                }
                break;

            case 11:
                if (n%2 == 0)
                {
                    buttonK.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonK.highlighted = NO;
                    n--;
                }
                break;
            case 12:
                if (n%2 == 0)
                {
                    buttonL.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonL.highlighted = NO;
                    n--;
                }
                break;
            case 13:
                if (n%2 == 0)
                {
                    buttonM.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonM.highlighted = NO;
                    n--;
                }
                break;
            case 14:
                if (n%2 == 0)
                {
                    buttonN.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonN.highlighted = NO;
                    n--;
                }
                break;
            case 15:
                if (n%2 == 0)
                {
                    buttonO.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonO.highlighted = NO;
                    n--;
                }
                break;

            case 16:
                if (n%2 == 0)
                {
                    buttonP.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonP.highlighted = NO;
                    n--;
                }
                break;
            case 17:
                if (n%2 == 0)
                {
                    buttonQ.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonQ.highlighted = NO;
                    n--;
                }
                break;
            case 18:
                if (n%2 == 0)
                {
                    buttonR.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonR.highlighted = NO;
                    n--;
                }
                break;
            case 19:
                if (n%2 == 0)
                {
                    buttonS.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonS.highlighted = NO;
                    n--;
                }
                break;
            case 20:
                if (n%2 == 0)
                {
                    buttonT.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonT.highlighted = NO;
                    n--;
                }
                break;

            case 21:
                if (n%2 == 0)
                {
                    buttonU.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonU.highlighted = NO;
                    n--;
                }
                break;
            case 22:
                if (n%2 == 0)
                {
                    buttonV.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonV.highlighted = NO;
                    n--;
                }
                break;
            case 23:
                if (n%2 == 0)
                {
                    buttonW.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonW.highlighted = NO;
                    n--;
                }
                break;
            case 24:
                if (n%2 == 0)
                {
                    buttonX.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonX.highlighted = NO;
                    n--;
                }
                break;
            case 25:
                if (n%2 == 0)
                {
                    buttonY.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonY.highlighted = NO;
                    n--;
                }
                break;
            case 26:
                if (n%2 == 0)
                {
                    buttonZ.highlighted = YES;
                    n++;
                }
                else 
                {
                    buttonZ.highlighted = NO;
                    n--;
                }
                break;

            default:
                break;
        }
    }
    else
    {
        [animationTimer invalidate];
        [audioPlayer release];
        audioPlayer = nil;
        switch (flag)
        {
            case 1:
                buttonA.highlighted = NO;
                break;
            case 2:
                buttonB.highlighted = NO;
                break;
            case 3:
                buttonC.highlighted = NO;
                break;
            case 4:
                buttonD.highlighted = NO;
                break;
            case 5:
                buttonE.highlighted = NO;
                break;
            case 6:
                buttonF.highlighted = NO;
                break;
            case 7:
                buttonG.highlighted = NO;
                break;
            case 8:
                buttonH.highlighted = NO;
                break;
            case 9:
                buttonI.highlighted = NO;
                break;
            case 10:
                buttonJ.highlighted = NO;
                break;
            case 11:
                buttonK.highlighted = NO;
                break;
            case 12:
                buttonL.highlighted = NO;
                break;
            case 13:
                buttonM.highlighted = NO;
                break;
            case 14:
                buttonN.highlighted = NO;
                break;
            case 15:
                buttonO.highlighted = NO;
                break;
            case 16:
                buttonP.highlighted = NO;
                break;
            case 17:
                buttonQ.highlighted = NO;
                break;
            case 18:
                buttonR.highlighted = NO;
                break;
            case 19:
                buttonS.highlighted = NO;
                break;
            case 20:
                buttonT.highlighted = NO;
                break;
            case 21:
                buttonU.highlighted = NO;
                break;
            case 22:
                buttonV.highlighted = NO;
                break;
            case 23:
                buttonW.highlighted = NO;
                break;
            case 24:
                buttonX.highlighted = NO;
                break;
            case 25:
                buttonY.highlighted = NO;
                break;
            case 26:
                buttonZ.highlighted = NO;
                break;
            default:
                break;
        }
    }
    
    
}

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

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

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft);//保持横屏
}

@end