在Objective-C中使用数组试图简化大量重复代码

Question

你好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.

我试图更好地理解iOS数组,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.有任何想法吗？

.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-> 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？如果是这样,我无法理解.

任何建议都不仅仅是值得赞赏的.我很想再对这个简单的问题不屑一顾.

谢谢!

Answer 1

我会将声音包装成一个子类,NSObject并使其成为一个独立的单元.声音会有操作,比如play,stop,pause和存取方法一样isPlaying,等等.

然后为了使它更通用,我将搜索匹配模式的所有文件"*.wav",然后为每个匹配的文件名,初始化Sound具有该文件名的对象,并将其添加到数组.

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.我发现这个答案有助于找到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,下一步是在您viewWillAppear或其他任何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];
}