For some reason, my timer code doesn’t seem to work; playBeat: never gets called.

timer = [[NSTimer timerWithTimeInterval:60/_bpm target:self selector:@selector(playBeat:) userInfo:nil repeats:YES] retain];

In case it matters, here is playBeat:

• (void)playBeat:(NSTimer *)theTimer { NSLog(@”playBeat: called”); }

I have searched through the APIs and Googled, but found nothing. Thanks.

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From Apple’s documentation

In Objective-C, there are three ways to create a timer. The following two class methods automatically register the new timer with the current NSRunLoop object in the default mode (NSDefaultRunLoopMode).

scheduledTimerWithTimeInterval:invocation:repeats: scheduledTimerWithTimeInterval:target:selector:userInfo:repeats:

The following two class methods create timers that you may register at a later time by sending the message addTimer:forMode: to an NSRunLoop object.

timerWithTimeInterval:invocation:repeats: timerWithTimeInterval:target:selector:userInfo:repeats:

Try using scheduledTimerWithTimeInterval:target:selector:userInfo:repeats:. –zootbobbalu