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POSimple iOS layer subclass doesn't position right
 

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  1. POSimple iOS layer subclass doesn't position right
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    <p>What appears when I run this thing is <a href="http://min.us/lyqPi" rel="nofollow">a little off on positioning</a>. It is a simple CALayer subclass with a drawInContext function and positioning it in the view controller.</p> <p>When I create the layer and add it, it is done with this code in the controller code. This runs, so the layer is created. <em>But the position is not correct.</em> It seems to work better in portrait, but I also need ways of detecting the rotation (but that is not my concern immediately).</p> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; Canvas *c = [Canvas layer]; self.canvas = c; [self.view.layer addSublayer: self.canvas]; //c.frame = self.view.bounds; self.canvas.anchorPoint = CGPointMake(0, 0); self.canvas.position = CGPointMake(0, 0); self.canvas.bounds = CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height); self.canvas.backgroundColor = [UIColor lightGrayColor].CGColor; [self.canvas setNeedsDisplay]; } </code></pre> <p><strike>The main problem seems to be in the actual drawing, the code follows, but it doesn't actually run even when calling needsDisplay. </strike></p> <pre><code>- (void)drawInContext:(CGContextRef)ctx { [super drawInContext: ctx]; CGContextSaveGState(ctx); UIGraphicsPushContext(ctx); // CGRect b = self.bounds; [self drawOrigin]; UIGraphicsPopContext(); CGContextRestoreGState(ctx); } - (void) drawOrigin { CGPoint centre = CGPointMake(self.bounds.size.width / 2, self.bounds.size.height / 2); UIBezierPath *hl = [UIBezierPath bezierPath]; [hl moveToPoint: centre]; [hl addLineToPoint: CGPointMake(centre.x, 0)]; [hl moveToPoint: centre]; [hl addLineToPoint: CGPointMake(centre.x, self.bounds.size.height)]; [hl moveToPoint: centre]; [hl addLineToPoint: CGPointMake(0, centre.y)]; [hl moveToPoint: centre]; [hl addLineToPoint: CGPointMake(self.bounds.size.width, centre.y)]; [hl stroke]; } </code></pre> <p>I don't know where else to look for this code. Any ideas or directions are welcome.</p>
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    1. USJeffrey Drake
    1. USJeffrey Drake
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    1. COA fellow from IRC assisted and have a solution for the drawing problem. The positioning is still an issue.
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      1. POSimple iOS layer subclass doesn't position right
      1. USJeffrey Drake
    2. COYour positioning issue may in fact be a portrait vs. landscape problem. Could it be that your additional layer is in fact drawn in portrait onto a view/layer that is in landscape?
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      1. POSimple iOS layer subclass doesn't position right
      1. USTill
 

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