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POAntialiasing problem resizing a UIView
 

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  1. POAntialiasing problem resizing a UIView
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    <p>My iPhone app displays a wheel in portrait mode:<br> <img src="https://i.stack.imgur.com/0xkMv.png" alt="enter image description here"></p> <p>When it is rotated to landscape mode it zooms in on the top quadrant of this wheel:<br> <img src="https://i.stack.imgur.com/XNa5Z.png" alt="enter image description here"></p> <p>The way I do this is to create a UIView (bounds: 768 x 768) to house the wheel, then:</p> <pre><code>- (void) layoutSubviews { UIDeviceOrientation O = [UIDevice currentDevice].orientation; : [self repositionWheelTo: O]; } - (void) repositionWheelTo: (UIDeviceOrientation) O { BOOL is_L = UIInterfaceOrientationIsLandscape( O ); CGPoint centerPoint = CGPointFromPoint2D( centreOfRect( self.bounds ) ); float sc = 320.0 / 768.0; if( ! isIPad() &amp;&amp; is_L ) { centerPoint.y += 200; sc *= 2.0; } if( isIPad() ) sc = 1.0; wvContainer.center = centerPoint; wvContainer.transform = CGAffineTransformMakeScale( sc, sc ); } </code></pre> <p>This means it now correctly draws to fit the entire wheel just within the screen on iPad and iPhone-portrait, and on iPhone-landscape it doubles in size.</p> <p>So in iPhone-portrait, you can imagine a 768x768 square that extends around the actual device screen, and the transform is set so that the buttons only get drawn onto the middle section of it.</p> <p>Arguably wasteful of memory, but right now I'm trying to keep the code manageable and I can't see a better way to do it, that lets me transition smoothly between portrait and landscape.</p> <p>Problem is, it looks really mucky on iPhone-portrait. The anti-aliasing just isn't working right. you can see a clear staircase effect on the A in Am that vanishes when it is rotated to landscape.</p> <p>How can I get the wheel to render at an acceptable quality in portrait mode?</p>
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