在Objective-C中使用数组试图简化大量重复代码

Question

Hello StackOverflow大师。这是我在这里的第一个问题所以我很高兴能够直接进入。

我试图更好地了解iOS阵列，并且我已经碰到了一堵砖墙。我正在制作一个使用FMOD的声音应用。我有一切工作完美，但我有9个按钮，所有都执行几乎完全相同的事情，除了每个按下播放不同的.wav文件然后发布停止声音。我想将它放入一个数组中，简化并缩短我的代码，这就是我迷失的地方。我删除了代码以显示我目前正在进行的操作。有什么想法吗？

·H

@interface {

FMOD::Sound    *sound1;
FMOD::Sound    *sound2;
FMOD::Sound    *sound3;
FMOD::Sound    *sound4;
FMOD::Sound    *sound5;
FMOD::Sound    *sound6;
FMOD::Sound    *sound7;
FMOD::Sound    *sound8;
FMOD::Sound    *sound9;

}

- (IBAction)playSound1:(id)sender;
- (IBAction)stopSound1:(id)sender;
- (IBAction)playSound2:(id)sender;
- (IBAction)stopSound2:(id)sender;
- (IBAction)playSound3:(id)sender;
- (IBAction)stopSound3:(id)sender;
- (IBAction)playSound4:(id)sender;
- (IBAction)stopSound4:(id)sender;
- (IBAction)playSound5:(id)sender;
- (IBAction)stopSound5:(id)sender;
- (IBAction)playSound6:(id)sender;
- (IBAction)stopSound6:(id)sender;
- (IBAction)playSound7:(id)sender;
- (IBAction)stopSound7:(id)sender;
- (IBAction)playSound8:(id)sender;
- (IBAction)stopSound8:(id)sender;
- (IBAction)playSound9:(id)sender;
- (IBAction)stopSound9:(id)sender;

米。

- (void)viewWillAppear:(BOOL)animated {

[[NSString stringWithFormat:@"%@/sound1.wav", [[NSBundle mainBundle] resourcePath]] getCString:buffer maxLength:200 encoding:NSASCIIStringEncoding];
    result = system->createSound(buffer, FMOD_SOFTWARE | FMOD_LOOP_NORMAL, NULL, &sound1);
    ERRCHECK(result);


    [[NSString stringWithFormat:@"%@/sound2.wav", [[NSBundle mainBundle] resourcePath]] getCString:buffer maxLength:200 encoding:NSASCIIStringEncoding];
    result = system->createSound(buffer, FMOD_SOFTWARE | FMOD_LOOP_NORMAL, NULL, &sound2);
    ERRCHECK(result);


    [[NSString stringWithFormat:@"%@/sound3.wav", [[NSBundle mainBundle] resourcePath]] getCString:buffer maxLength:200 encoding:NSASCIIStringEncoding];
    result = system->createSound(buffer, FMOD_SOFTWARE | FMOD_LOOP_NORMAL, NULL, &sound3);
    ERRCHECK(result);


    [[NSString stringWithFormat:@"%@/sound4.wav", [[NSBundle mainBundle] resourcePath]] getCString:buffer maxLength:200 encoding:NSASCIIStringEncoding];
    result = system->createSound(buffer, FMOD_SOFTWARE, NULL, &sound4);
    ERRCHECK(result);
    result = sound4->setMode(FMOD_LOOP_NORMAL);
    ERRCHECK(result);

    [[NSString stringWithFormat:@"%@/sound5.wav", [[NSBundle mainBundle] resourcePath]] getCString:buffer maxLength:200 encoding:NSASCIIStringEncoding];
    result = system->createSound(buffer, FMOD_SOFTWARE | FMOD_LOOP_NORMAL, NULL, &sound5);
    ERRCHECK(result);


    [[NSString stringWithFormat:@"%@/sound6.wav", [[NSBundle mainBundle] resourcePath]] getCString:buffer maxLength:200 encoding:NSASCIIStringEncoding];
    result = system->createSound(buffer, FMOD_SOFTWARE | FMOD_LOOP_NORMAL, NULL, &sound6);
    ERRCHECK(result);


    [[NSString stringWithFormat:@"%@/sound7.wav", [[NSBundle mainBundle] resourcePath]] getCString:buffer maxLength:200 encoding:NSASCIIStringEncoding];
    result = system->createSound(buffer, FMOD_SOFTWARE | FMOD_LOOP_NORMAL, NULL, &sound7);
    ERRCHECK(result);


    [[NSString stringWithFormat:@"%@/sound8.wav", [[NSBundle mainBundle] resourcePath]] getCString:buffer maxLength:200 encoding:NSASCIIStringEncoding];
    result = system->createSound(buffer, FMOD_SOFTWARE | FMOD_LOOP_NORMAL, NULL, &sound8);
    ERRCHECK(result);


    [[NSString stringWithFormat:@"%@/sound9.wav", [[NSBundle mainBundle] resourcePath]] getCString:buffer maxLength:200 encoding:NSASCIIStringEncoding];
    result = system->createSound(buffer, FMOD_SOFTWARE | FMOD_LOOP_NORMAL, NULL, &sound9);
    ERRCHECK(result);

}



- (IBAction)playSound1:(id)sender
{
    FMOD_RESULT result = FMOD_OK;
    result = system->playSound(FMOD_CHANNEL_FREE, sound1, false, &wob01);
    ERRCHECK(result);    
}

- (IBAction)stopSound1:(id)sender
{
    FMOD_RESULT result = FMOD_OK;

    result = wob01->stop();
    ERRCHECK(result);   
}

- (IBAction)playSound2:(id)sender
{
    FMOD_RESULT result = FMOD_OK;

    result = system->playSound(FMOD_CHANNEL_FREE, sound2, false, &wob02);
    ERRCHECK(result);    
}

- (IBAction)stopSound2:(id)sender
{
    FMOD_RESULT result = FMOD_OK;

    result = wob02->stop();
    ERRCHECK(result);   
}

- (IBAction)playSound3:(id)sender
{
    FMOD_RESULT result = FMOD_OK;

    result = system->playSound(FMOD_CHANNEL_FREE, sound3, false, &wob03);
    ERRCHECK(result);    
}

- (IBAction)stopSound3:(id)sender
{
    FMOD_RESULT result = FMOD_OK;

    result = wob03->stop();
    ERRCHECK(result);   
}

- (IBAction)playSound4:(id)sender
{
    FMOD_RESULT result = FMOD_OK;

    result = system->playSound(FMOD_CHANNEL_FREE, sound4, false, &wob04);
    ERRCHECK(result);    
}

- (IBAction)stopSound4:(id)sender
{
    FMOD_RESULT result = FMOD_OK;

    result = wob04->stop();
    ERRCHECK(result);   
}

- (IBAction)playSound5:(id)sender
{
    FMOD_RESULT result = FMOD_OK;

    result = system->playSound(FMOD_CHANNEL_FREE, sound5, false, &wob05);
    ERRCHECK(result);    
}

- (IBAction)stopSound5:(id)sender
{
    FMOD_RESULT result = FMOD_OK;

    result = wob05->stop();
    ERRCHECK(result);   
}

- (IBAction)playSound6:(id)sender
{
    FMOD_RESULT result = FMOD_OK;

    result = system->playSound(FMOD_CHANNEL_FREE, sound6, false, &wob06);
    ERRCHECK(result);    
}

- (IBAction)stopSound6:(id)sender
{
    FMOD_RESULT result = FMOD_OK;

    result = wob06->stop();
    ERRCHECK(result);   
}

- (IBAction)playSound7:(id)sender
{
    FMOD_RESULT result = FMOD_OK;
    result = system->playSound(FMOD_CHANNEL_FREE, sound7, false, &wob07);
    ERRCHECK(result);    
}

- (IBAction)stopSound7:(id)sender
{
    FMOD_RESULT result = FMOD_OK;
    result = wob07->stop();
    ERRCHECK(result);   
}

- (IBAction)playSound8:(id)sender
{
    FMOD_RESULT result = FMOD_OK;
    result = system->playSound(FMOD_CHANNEL_FREE, sound8, false, &wob08);
    ERRCHECK(result);    
}

- (IBAction)stopSound8:(id)sender
{
    FMOD_RESULT result = FMOD_OK;
    result = wob08->stop();
    ERRCHECK(result);   
}

- (IBAction)playSound9:(id)sender
{
    FMOD_RESULT result = FMOD_OK;
    result = system->playSound(FMOD_CHANNEL_FREE, sound9, false, &wob09);
    ERRCHECK(result);    
}

- (IBAction)stopSound9:(id)sender
{
    FMOD_RESULT result = FMOD_OK;
    result = wob09->stop();
    ERRCHECK(result);   
}

如您所见，所有代码都重复了。这是我能够让它工作的唯一方法，但我知道这些可以放入一个数组中，我无法弄明白。可能是NSMutableArray并列出“sound1”，“sound2”等等。然后在界面构建器中为每个按钮分配一个标签？理想情况下，我想为stopSound提供一个函数，一个用于playSound等，它使用标签来播放或停止正确的声音文件。当使用FMOD的system-＆gt; createSound（）时，最后一个参数是一个变量来存储新创建的声音。有没有办法将它存储在数组或字典中呢？如果是这样，我无法理解。

任何建议都不仅仅是值得赞赏的。我很想不再对这个简单的问题大打折扣。

谢谢！

Answer 1

我会将声音包装到NSObject的子类中，并使其成为一个自包含的单元。声音会有play，stop，pause和isPlaying等访问器等操作。

然后为了使它更通用，我会搜索匹配模式"*.wav"的所有文件，然后对于每个匹配的文件名，用该文件名初始化Sound对象，并将其添加到阵列。

这就是我想象的Sound对象的样子：

@interface Sound : NSObject

@property FMOD::Sound *sound;

- (id)initWithSoundFilePath:(NSString *)path;
- (void)play;
- (void)stop;

@end

@implementation Sound

- (void)dealloc {
    // free the memory occupied by the sound pointer here
}

- (id)initWithSoundFilePath:(NSString *)path {
    self = [super init];
    if (self) {
        result = system->createSound(path, FMOD_SOFTWARE | FMOD_LOOP_NORMAL, NULL, &sound);
        ERRCHECK(result);
    }
    return self;
}

- (void)play {
    FMOD_RESULT result = FMOD_OK;
    result = system->playSound(FMOD_CHANNEL_FREE, sound, false, /* What is this wob? */);
    ERRCHECK(result);
}

- (void)stop {
    FMOD_RESULT result = FMOD_OK;
    result = /* What is this wob */->stop();
    ERRCHECK(result);   
}

@end

所以你有它。声音很好地封装了。我发现这个answer有助于查找符合某些条件的特定目录中的所有文件的列表。您可以在视图控制器中使用它来自动生成所有相关的Sound对象并将其添加到数组中。

- (NSArray *)getPathsOfSoundFiles {
    NSString *rootPath = [[NSBundle mainBundle] resourcePath];
    NSFileManager *fm = [NSFileManager defaultManager];
    NSArray *files = [fm contentsOfDirectoryAtPath:rootPath error:nil];
    NSPredicate *soundFileFilter = [NSPredicate predicateWithFormat:@"self ENDSWITH '.wav'"];
    NSArray *soundFilePaths = [files filteredArrayUsingPredicate:soundFileFilter];
    return soundFilePaths;
}

好了，现在您可以检索所有.wav文件的路径，下一步是在viewWillAppear或其他最有意义的方法中初始化它们。

- (void)viewWillAppear:(BOOL)animated {
    NSArray *paths = [self getPathsOfSoundFiles];
    NSMutableArray *sounds = [NSMutableArray array];
    for (NSString *path in paths) {
        Sound *sound = [[Sound alloc] initWithSoundFilePath:path];
        [sounds addObject:sound];
    }
    self.sounds = sounds;
}

通过声音阵列设置，播放和停止给定声音变得相当容易。使用可以创建一个方法，将索引引入数组，或者可能是Sound对象本身并完成工作。

- (void)playSoundAtIndex:(NSUInteger)soundIndex {
    Sound *sound = [self.sounds objectAtIndex:soundIndex];
    [sound play];
}

- (void)stopSoundAtIndex:(NSUInteger)soundIndex {
    Sound *sound = [self.sounds objectAtIndex:soundIndex];
    [sound stop];
}

Answer 2

您可以大量概括您的代码：

• 使用数组存储您的声音和“滚动”
• 使用类似[NSString stringWithFormat:@"%@/sound%i.wav", [[NSBundle mainBundle] resourcePath], index]
的循环
• 只有一个-playSound:和一个-stopStound:操作使用sender的{​​{3}}（您可以在Interface Builder中设置或在您的按钮中创建按钮时自动化查看控制器的代码）以确定要播放的声音或要停止的声音。

Answer 3

我强烈建议您继承UIButton并覆盖触摸方法，以便在发生这些操作时播放音频文件。当您对UIButton进行子类化时，您需要在头文件中设置一个属性，以便传入音频文件或音频文件所在的字符串，这样就可以很容易地使其动态化。

然后在主文件中，就像我说的那样只是覆盖那些触摸方法（touchesBegan，touchesEnded等）来播放我们在头文件中定义的自定义属性。

这就是我至少解决你的问题的方法，那么你只有一个UIButton子类可以做同样的事情，具体取决于你传入的音频文件。