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PO-(void) drawRect:(CGRect)rect; is using up nearly all of iPhone CPU
 

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    <pre><code>- (void)drawRect:(CGRect)rect{ float sliceSize = rect.size.width / imagesShownAtOnce; //Apply our clipping region and fill it with black [clippingRegion addClip]; [clippingRegion fill]; //Draw the 3 images (+1 for inbetween), with our scroll amount. CGPoint loc; for (int i=0;i&lt;imagesShownAtOnce+1;i++){ loc = CGPointMake(rect.origin.x+(i*sliceSize)-imageScroll, rect.origin.y); [[buttonImages objectAtIndex:i] drawAtPoint:loc]; } //Draw the text region background [[UIColor blackColor] setFill]; [textRegion fillWithBlendMode:kCGBlendModeNormal alpha:0.4f]; //Draw the actual text. CGRect textRectangle = CGRectMake(rect.origin.x+16,rect.origin.y+rect.size.height*4/5.6,rect.size.width/1.5,rect.size.height/3); [[UIColor whiteColor] setFill]; [buttonText drawInRect:textRectangle withFont:[UIFont fontWithName:@"Avenir-HeavyOblique" size:22]]; } </code></pre> <p><code>clippingRegion</code> and <code>textRegion</code> are <code>UIBezierPaths</code> to give me the rounded rectangles I want (First for a clipping region, 2nd as an overlay for my text)</p> <p>The middle section is drawing 3 images and letting them scroll along, which im updating every 2 refreshes from a <code>CADisplayLink</code>, and that invalidates the draw region by calling <code>[self setNeedsDisplay]</code>, and also increasing my imageScroll variable.</p> <hr> <p>Now that that background information is done, here is my issue:</p> <p>It runs, and even runs smoothly. But it is using up an absolutely high amount of CPU time (80%+)!! How do I push this off to the GPU on the phone instead? Someone told me about CALayers but I've never dealt with them before</p>
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