从apple iso 示例代码里面提取出来的音效播放类

最新推荐文章于 2025-11-19 09:18:52 发布

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本文介绍了一个用于iOS应用的自定义音效播放器类SoundEffect的实现细节。该类利用了AudioToolbox框架下的AudioServices功能来加载并播放不同类型的音频文件(.caf)，包括远距离声音(farSound)、近距离声音(nearSound)和等级变化声音(levelSound)。

使用代码

    farSound = [[SoundEffect alloc] initWithContentsOfFile:[mainBundle pathForResource:@"farSound" ofType:@"caf"]];
    nearSound = [[SoundEffect alloc] initWithContentsOfFile:[mainBundle pathForResource:@"nearSound" ofType:@"caf"]];
    levelSound = [[SoundEffect alloc] initWithContentsOfFile:[mainBundle pathForResource:@"levelSound" ofType:@"caf"]];

类头文件

#import <UIKit/UIKit.h>
#import <AudioToolbox/AudioServices.h>

@interface SoundEffect : NSObject {
    SystemSoundID _soundID;
}

+ (id)soundEffectWithContentsOfFile:(NSString *)aPath;
- (id)initWithContentsOfFile:(NSString *)path;
- (void)play;

@end

实现代码

#import "SoundEffect.h"

@implementation SoundEffect
+ (id)soundEffectWithContentsOfFile:(NSString *)aPath {
    if (aPath) {
        return [[[SoundEffect alloc] initWithContentsOfFile:aPath] autorelease];
    }
    return nil;
}

- (id)initWithContentsOfFile:(NSString *)path {
    self = [super init];
    
    if (self != nil) {
        NSURL *aFileURL = [NSURL fileURLWithPath:path isDirectory:NO];
        
        if (aFileURL != nil)  {
            SystemSoundID aSoundID;
            OSStatus error = AudioServicesCreateSystemSoundID((CFURLRef)aFileURL, &aSoundID);
            
            if (error == kAudioServicesNoError) { // success
                _soundID = aSoundID;
            } else {
                NSLog(@"Error %d loading sound at path: %@", error, path);
                [self release], self = nil;
            }
        } else {
            NSLog(@"NSURL is nil for path: %@", path);
            [self release], self = nil;
        }
    }
    return self;
}

-(void)dealloc {
    AudioServicesDisposeSystemSoundID(_soundID);
    [super dealloc];
}

-(void)play {
    AudioServicesPlaySystemSound(_soundID);
}

@end