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POMemory issues with Core Graphics
 

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  1. POMemory issues with Core Graphics
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    <p>I draw a table "by hand", by using primitives of Core Graphics. The view is re-draw when I click a button. The problem is that when I profile the code in Instruments, the VM Regions keep increase, while Heap and Anonymous VM oscillate (and I would expect it).</p> <p><img src="https://i.stack.imgur.com/KVKNw.png" alt="enter image description here"></p> <p>And the details about CoreAnimation:</p> <p><img src="https://i.stack.imgur.com/6la2B.png" alt="enter image description here"></p> <p>An excerpt of my drawRect:</p> <pre><code>- (void)drawRect:(CGRect)rect { // Drawing code CGContextRef context = UIGraphicsGetCurrentContext(); CGRect paperRect = CGRectMake(self.bounds.origin.x+hourLabelSize+self.marginX, 10 +self.cellBorder , self.bounds.size.width, self.cellHeight * 48 ); // custom shadow drawLinearGradient(context, paperRect, whiteColor.CGColor, lightGrayColor.CGColor); CGContextSaveGState(context); CGFloat outerMargin = 5.0f; CGFloat eventSize; // Draw table CGRect hourRect; CGRect outerRect; CGMutablePathRef outerPath; CGRect strokeRect; CGRect rowRect; for (int j=0; j &lt; 7;j++) { for (int i=0; i &lt; numberOfRows; i++) { // Odd index means we are in the half of an hour if ( (i%2) == 0) { [hour setString:[NSString stringWithFormat:@"%d:00",(int)floor(i/2)]]; // Draw box around hours // if (j == 0 &amp;&amp; i &gt;0) { CGContextSaveGState(context); hourRect = CGRectMake(5, i*cellHeight-5, hourLabelSize, 28); outerRect = CGRectInset(hourRect, outerMargin, outerMargin); outerPath = newRoundedRectForRect(outerRect, 6.0); CGContextAddPath(context, outerPath); CFRelease(outerPath); // &lt;--- This solve the leak!! // Draw gradient strokeRect = CGRectInset(hourRect, 5.0, 5.0); CGContextSetStrokeColorWithColor(context, boxColor.CGColor); CGContextSetLineWidth(context, 1.0); CGContextStrokeRect(context, strokeRect); drawLinearGradient(context, strokeRect, whiteColor.CGColor, lightGrayColor.CGColor); CGContextRestoreGState(context); } } else { [hour setString:[NSString stringWithFormat:@"%d:30",(int)floor(i/2)]]; } // Draw hours if (j == 0 &amp;&amp; i &gt; 0) [hour drawInRect:CGRectMake(0, i*cellHeight, hourLabelSize+10, 26) withFont:font lineBreakMode:NSLineBreakByClipping alignment:NSTextAlignmentCenter]; // Draw row CGContextBeginPath(context); CGContextSetStrokeColorWithColor(context, boxColor.CGColor); CGContextSetLineWidth(context, self.cellBorder); rowRect = CGRectMake(j*cellWidth + hourLabelSize +self. marginX - self.cellBorder/2, i*cellHeight+10 + self.cellBorder / 2, cellWidth , cellHeight); CGContextStrokeRect(context, rowRect); } // CGContextFlush(context); CGContextRestoreGState(context); </code></pre> <p>The first thing I do not understand is why I see VM:CoreAnimation. CoreGraphics is part of Core Animation? Secondly, what I shall watch as syntoms of bad allocation: VM Regions, XCode measurements or Head and Anonymous? Regards!</p> <p><strong>[EDIT]</strong></p> <p>The <code>createRoundedRect</code> is as follows</p> <pre><code>CGMutablePathRef newRoundedRectForRect(CGRect rect, CGFloat radius) { CGMutablePathRef path = CGPathCreateMutable(); CGPathMoveToPoint(path, NULL, CGRectGetMidX(rect), CGRectGetMinY(rect)); CGPathAddArcToPoint(path, NULL, CGRectGetMaxX(rect), CGRectGetMinY(rect), CGRectGetMaxX(rect), CGRectGetMaxY(rect), radius); CGPathAddArcToPoint(path, NULL, CGRectGetMaxX(rect), CGRectGetMaxY(rect), CGRectGetMinX(rect), CGRectGetMaxY(rect), radius); CGPathAddArcToPoint(path, NULL, CGRectGetMinX(rect), CGRectGetMaxY(rect), CGRectGetMinX(rect), CGRectGetMinY(rect), radius); CGPathAddArcToPoint(path, NULL, CGRectGetMinX(rect), CGRectGetMinY(rect), CGRectGetMaxX(rect), CGRectGetMinY(rect), radius); CGPathCloseSubpath(path); return path; }: </code></pre> <p>and the <code>drawLineGradient.m</code> :</p> <pre><code>void drawLinearGradient(CGContextRef context, CGRect rect, CGColorRef startColor, CGColorRef endColor) { CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGFloat locations[] = { 0.0, 1.0 }; NSArray *colors = @[(__bridge id) startColor, (__bridge id) endColor]; CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef) colors, locations); CGPoint startPoint = CGPointMake(CGRectGetMidX(rect), CGRectGetMinY(rect)); CGPoint endPoint = CGPointMake(CGRectGetMidX(rect), CGRectGetMaxY(rect)); CGContextSaveGState(context); CGContextAddRect(context, rect); CGContextClip(context); CGContextDrawLinearGradient(context, gradient, startPoint, endPoint, 0); CGContextRestoreGState(context); CGGradientRelease(gradient); CGColorSpaceRelease(colorSpace); colors = nil; </code></pre> <p>}</p>
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      1. VTUpMod
    1. COWhat does the static analyser tell you? I'd suspect the drawLinearGradient method, since it isn't shown here, also your createRoundedRect...
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      1. POMemory issues with Core Graphics
      1. USjrturton
    2. COSee my edited answer, I added some code.
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      1. USgiuseppe
 

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