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POFastest way to render UIButtons using layers and Grand Central Dispatch?
 

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  1. POFastest way to render UIButtons using layers and Grand Central Dispatch?
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    <p>I have a grid of 30 UIButtons and potentially even more, subclassed to be rendered using layers: a base <code>CALayer</code>, a <code>CAShapeLayer</code>, a <code>CAGradientLayer</code> and a <code>CATextLayer</code>. I am trying to minimize the overall time required to render/display the buttons when the corresponding xib file is loaded. If I simply setup each button in turn in <code>viewDidLoad</code>, the time required for the view to appear is about 5-6 seconds, which is clearly too much.</p> <p>In order to speed-up the buttons setup, I am using Grand Central Dispatch as follows. In <em>viewDidLoad</em>, I setup each button layers using <code>dispatch_async</code> on the global queue (adding to the base layer the shape and the gradient layers), so that the buttons can be rendered in a different thread. A the end of the block, the CATextLayer is added to the gradient layer.</p> <pre><code>dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{ CGRect base_bounds = CGRectMake(0, 0, self.layer.bounds.size.width, self.layer.bounds.size.height - self.layer.bounds.size.height * 0.10f); CGPoint move_point = CGPointMake(0.0f, base_bounds.size.height * 0.10f); self.layer.masksToBounds = NO; baseLayer = [CALayer layer]; baseLayer.cornerRadius = 10.0; baseLayer.shadowOffset = CGSizeMake(0.0f, 2.0f); baseLayer.shadowOpacity = 1.5f; baseLayer.shadowColor = [UIColor blackColor].CGColor; baseLayer.shadowRadius = 2.5f; baseLayer.anchorPoint = CGPointMake(0.5f, 0.5f); baseLayer.position = move_point; CAShapeLayer *shape = [CALayer layer]; shape.bounds = base_bounds; shape.cornerRadius = 10.0; shape.anchorPoint = CGPointMake(0.0f, 0.0f); shape.position = move_point; shape.backgroundColor = [UIColor darkGrayColor].CGColor; gradient = [CAGradientLayer layer]; gradient.anchorPoint = CGPointMake(0.0f, 0.0f); gradient.position = CGPointMake(0.0f, 0.0f); gradient.bounds = base_bounds; gradient.cornerRadius = 10.0; gradient.borderColor = [UIColor colorWithRed:0.72f green:0.72f blue:0.72f alpha:1.0].CGColor; gradient.borderWidth = 0.73; gradient.colors = [NSArray arrayWithObjects: (id)[UIColor whiteColor].CGColor, (id)[UIColor whiteColor].CGColor, nil]; [baseLayer addSublayer:shape]; [baseLayer addSublayer:gradient]; [self.layer addSublayer:baseLayer]; [textLayer setBounds:gradient.bounds]; [textLayer setPosition:CGPointMake(CGRectGetMidX(textLayer.bounds), CGRectGetMaxY(textLayer.bounds) - 6)]; [textLayer setString:self.titleLabel.text]; [textLayer setForegroundColor:[UIColor blackColor].CGColor]; [gradient addSublayer:textLayer]; }); </code></pre> <p>This approach reduce the overall time to about 2-3 seconds. I am wondering if anyone can suggest a faster way to render the buttons. Please note that I am not interested to any solution which discards the use of layers.</p> <p>Thank you in advance.</p>
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    1. USMassimo Cafaro
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    1. COHave you identified the bottlenecks using Instruments and the Timing Profile?
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      1. USMike Weller
    2. CO@MikeWeller: yes, the times to execute the source code shown in my question are those reported by Instruments.
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