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POHow can I draw a rotated UIView with a shadow but without the shadow being rotated as well
 

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  1. POHow can I draw a rotated UIView with a shadow but without the shadow being rotated as well
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    <p>I'd like the shadow applied correctly after rotation. This is my code:</p> <pre><code>myButton.transform = CGAffineTransformMakeRotation(M_PI / 180.0 * 90.0); myButton.layer.shadowOffset = CGSizeMake(12.0, 12.0); myButton.layer.shadowRadius = 2.0; myButton.layer.shadowOpacity = 0.8; myButton.layer.shadowColor = [UIColor blackColor].CGColor; </code></pre> <p>Without rotation the shadow looks fine:</p> <p><img src="https://i.stack.imgur.com/z2RRW.png" alt="enter image description here"></p> <p>But after rorating it by 90° the shadow is rotated as well:</p> <p><img src="https://i.stack.imgur.com/hYlWV.png" alt="enter image description here"></p> <p>Is there anything I can do about it without overriding the drawRect method and do low level drawing? Or maybe some method which corrects the shadowOffset with a given rotation angle? It's easy to correct the offset by hand for 90° so this is no option ;)</p> <p>It should look like this:</p> <p><img src="https://i.stack.imgur.com/jTRIX.png" alt="enter image description here"></p> <p>Thanks in advance!</p> <p><strong>With help of Bartosz Ciechanowski this works now!</strong></p> <pre><code>float angleInRadians = M_PI / 180.0 * -35.0; myButton.transform = CGAffineTransformMakeRotation(angleInRadians); myButton.layer.shadowOffset = [self correctedShadowOffsetForRotatedViewWithAngle:(angleInRadians) andInitialShadowOffset:CGSizeMake(12.0, 12.0)]; myButton.layer.shadowRadius = 2.0; myButton.layer.shadowOpacity = 0.8; myButton.layer.shadowColor = [UIColor blackColor].CGColor; </code></pre> <p>This results in:</p> <p><img src="https://i.stack.imgur.com/39oBT.png" alt="enter image description here"></p> <p>instead of </p> <p><img src="https://i.stack.imgur.com/Je9tv.png" alt="enter image description here"></p>
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    1. USNick Weaver
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      1. POHow can I draw a rotated UIView with a shadow but without the shadow being rotated as well
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    1. COI didn't get whether hand-correction of the offset is an acceptable solution for you or not. You can compute the offset either manually with sin/cos or just apply an inverted transform of the button
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      1. POHow can I draw a rotated UIView with a shadow but without the shadow being rotated as well
      1. USGobra
    2. CO@Gobara, hand-correction is absolutely acceptable but it has to be a reusable solution not just one for my code example. A method with this header would be pretty cool: `- (CGSize)correctedShadowOffsetForRotatedViewWithAngle:(float)anAngle andInitialShadowOffset:(CGSize)anOffset`
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      1. POHow can I draw a rotated UIView with a shadow but without the shadow being rotated as well
      1. USNick Weaver
    3. COhave you tried using any of `UIView`'s `convert...` methods? It looks like you'd have to put the `CGSize` in a rect because UIView doesn't have a method for converting sizes directly.
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      1. POHow can I draw a rotated UIView with a shadow but without the shadow being rotated as well
      1. USRichard
 

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