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PORunning multiple CADisplayLinks at a time ?
 

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  1. PORunning multiple CADisplayLinks at a time ?
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    <p>I'm using CADisplayLink as a timer for strobing. </p> <p>I have 2 CADisplayLinks:</p> <p>The main one (this runs during the whole thing):</p> <pre><code>SMPTELink = [CADisplayLink displayLinkWithTarget:self selector:@selector(onTick)]; SMPTELink.frameInterval = 1; [SMPTELink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode]; </code></pre> <p>The strobe one (this only runs when strobing occurs):</p> <pre><code>strobeLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(toggleStrobe)]; strobeLink.frameInterval = 1; [strobeLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode]; [strobeLink setPaused:YES]; // I setPaused:NO when using the strobe. </code></pre> <p>Is it bad to run two CADisplayLinks at once? Sometimes my strobe doesn't look as smooth as I think it should be. Here is my toggleStrobe method:</p> <pre><code>-(void)toggleStrobe { if (!self.firstTimestampStrobe) self.firstTimestampStrobe = strobeLink.timestamp; NSTimeInterval elapsed = (strobeLink.timestamp - self.firstTimestampStrobe); NSInteger frameNumber = (NSInteger)(elapsed * ((strobeValue*15)/255)) % 2; if (frameNumber != self.lastFrameStrobe) { if (frameNumber == 1) { UIColor *color = [[UIColor alloc] initWithRed: 0 green: 0 blue: 0 alpha: 1.0]; strobeBackground.backgroundColor = color; } else { UIColor *color = [[UIColor alloc] initWithRed: 0 green: 0 blue: 0 alpha: 0]; strobeBackground.backgroundColor = color; } self.lastFrameStrobe = frameNumber; } } </code></pre>
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