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POCore animation geometry for layer-backed view
 

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    <p>I have a layer-backed view, and want to understand how anchor point works for it and is it allowed at all to work with CALayer geometry properties (instead of using frame property of NSView)</p> <p>First, quote from documentation:</p> <blockquote> <p>The default value for anchorPoint is (0.5,0.5) which corresponds to the center of the layer's bounds</p> </blockquote> <p>But when I try to change value of anchor point to (0.5,0.5) directly, I got offset. Here is example, red area is the original position (when nothing applied to the anchor point), the button was moved to the bottom-left corner:</p> <p><img src="https://i.stack.imgur.com/LhcAb.png" alt="enter image description here"></p> <p>When I set anchor point to (0,0) button placed where it should be:</p> <p><img src="https://i.stack.imgur.com/TiKhb.png" alt="enter image description here"></p> <p><strong>Update</strong>:</p> <p>Here is the code I use to instantiate Button:</p> <pre><code>self.button = [[NSButton alloc] initWithFrame:NSMakeRect(130, 130, 100, 40)]; self.button.title = @"My Title"; self.button.wantsLayer = YES; NSLog(@"Button anchor Point is : (%f;%f)", self.button.layer.anchorPoint.x, self.button.layer.anchorPoint.y); [panelView addSubview:self.button]; </code></pre> <p>What interesting, seems that for layer-backed view's the default anchor point is 0,0:</p> <pre><code>NSLog(@"Button anchor Point is : (%f;%f)", self.button.layer.anchorPoint.x, self.button.layer.anchorPoint.y); </code></pre> <p>produces (0.000000;0.000000)</p> <p>After all, OS X Deployment target is 10.8</p>
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    1. USdmitrynikolaev
    1. USdmitrynikolaev
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    1. COVery interesting. What happens if you apply a rotation transform to the layer? It should rotate around its anchor point which seems to be the lower left corner in your case. How do you modify the _layer_ geometry before changing the anchor point? Do you modify the position, frame or bounds? Do you modify the _view_ geometry at all before setting the anchor point?
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      1. USDavid Rönnqvist
    2. COI update question with code and some Log output.
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      1. USdmitrynikolaev
    3. CO+1 Good question. Does calling `[NSView addSubview]` also add the subview's layer to the backing layer of the receiver? The docs don't mention it.
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      1. UStrojanfoe
 

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