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copied!<p>What do you use to play sounds? I think you could disable sounds by deactivating the audio session – see <a href="http://developer.apple.com/IPhone/library/documentation/AudioToolbox/Reference/AudioSessionServicesReference/Reference/reference.html#//apple_ref/c/func/AudioSessionSetActive" rel="nofollow noreferrer">AudioSessionSetActive</a>.</p> <hr> <p><em>Update:</em> Yes, you’re right. I’ve just tried deactivating the audio session and the sounds seemed to go on. Nevermind. You could use the boolean flag approach, and there is no need to have a condition around every sound. The way I do SFX in my game is through a separate class, a kind of ‘view’ that observes the model and creates sounds for various game events. This way you keep a clean separation of concerns in the design and when you want to switch the sounds off, you simply disconnect the sound class from the model. The code looks a bit like this:</p> <pre><code>@implementation Model - (void) stepBy: (double) seconds { [player doSomething]; if (player.isDead) [self sendNotification:@selector(playerHasDied:) withObject:player]; } @end </code></pre> <p>And the sound view:</p> <pre><code>@implementation SFX - (void) playerHasDied: (id) player { [aarghSound play]; } @end </code></pre> <p>Of course you have to implement the actual observing part. You could use <code>NSNotificationCenter</code> or write your own dispatching code using an array of observers:</p> <pre><code>@implementation Model - (void) addObserver: (id) object { [observers addObject:object]; } - (void) sendNotification: (SEL) message { for (id observer in observers) if ([observer respondsToSelector:message]) [observer performSelector:message]; } @end </code></pre> <p>The SFX view is connected to the model:</p> <pre><code>Model *model = [[Model alloc] init]; SFX *sounds = [[SFX alloc] init]; [model addObserver:sounds]; </code></pre> <p>When you want to disable all sounds, you just disconnect the SFX from the model; stop observing. If the sounds are disabled before the game starts, you even do not have to allocate the SFX class – this saves time, performance and memory.</p>

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