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POUIEdgeInsets ignored on CGContextDrawImage within a UIGraphicsBeginImageContextWithOptions
 

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    <p>I am struggling getting Image Insets to work when drawing to an off screen buffer.</p> <p>Using the resizableImageWithCapInsets: on an UIImage directly setImage: into a button works fine for me:</p> <pre><code>UIImage * base = [UIImage imageNamed:@"button.png"]; UIImage * img = [base resizableImageWithCapInsets:UIEdgeInsetsMake(20,20,20,20)]; [self setImage:img forState:UIControlStateNormal]; </code></pre> <p>As shown below (left is raw scaling, right is scaled with insets):</p> <p><img src="https://i.stack.imgur.com/Vcau1.png" alt="Image stretched without ado"> <img src="https://i.stack.imgur.com/alfVc.png" alt="Image stretched with decent insets"></p> <p>So the right one is fine - the lines top/botton/left/right are equally spaced. So far so good.</p> <p>Now if I try the very same thing with an image that is drawn and then captured to an off screen buffer with:</p> <pre><code>UIImage * base = [UIImage imageNamed:@"button.png"]; base = [base resizableImageWithCapInsets:UIEdgeInsetsMake(20,20,20,20)]; UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, 0); ctx = UIGraphicsGetCurrentContext(); CGContextDrawImage(ctx, CGRectMake(0,0,self.bounds.size.width, self.bounds.size.height), [base CGImage]); img = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); [self setImage:img forState:UIControlStateNormal]; </code></pre> <p>I get below (again left is raw scaling, right is with insets):</p> <p><img src="https://i.stack.imgur.com/pUPAV.png" alt="raw scaling, side buffer"><img src="https://i.stack.imgur.com/u3Rgb.png" alt="scaling with inset, side buffer (WRONG!)">.</p> <p>So here it seems that the insets are ignored.</p> <p>Anyone any suggestions as to what is going wrong here ? Fully functional example at <a href="http://people.apache.org/~dirkx/insetSample.zip" rel="nofollow noreferrer">http://people.apache.org/~dirkx/insetSample.zip</a> and just the key code at <a href="http://pastebin.com/rm8h6YFV" rel="nofollow noreferrer">http://pastebin.com/rm8h6YFV</a>.</p> <p>Any and all suggestions appreciated.</p> <p>Dw</p>
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