iOS Core Animation: Advanced Techniques by Nick Lockwood

By Nick Lockwood

Center Animation is the expertise underlying Apple’s iOS person interface. by means of unleashing the total strength of middle Animation, you could increase your app with awesome 2nd and 3D visible results and create interesting and specific new interfaces.

In this in-depth consultant, iOS developer Nick Lockwood takes you step by step during the center Animation framework, increase your knowing via pattern code and diagrams including finished factors and beneficial assistance. Lockwood demystifies the center Animation APIs, and teaches you ways to make use of

• Layers and perspectives, software program drawing and compositing
• Layer geometry, hit trying out and clipping
• Layer results, transforms and 3D interfaces
• Video playback, textual content, tiled photos, OpenGL, debris and reflections
• Implicit and particular animations
• estate animations, keyframes and transitions
• Easing, frame-by-frame animation and physics
• functionality tuning
• and masses, even more!

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Conversely, changing the frame may affect any or all of those values, as well. 2). 2 The effect that rotating a view or layer has on its frame property anchorPoint As mentioned earlier, both the view’s center property and the layer’s position property specify the location of the anchorPoint of the layer relative to its superlayer. The anchorPoint property of a layer controls how the layer’s frame is positioned relative to its position property. You can think of the anchorPoint as being the handle used to move the layer around.

Let’s modify the project we created in Chapter 1 to display an image rather than a background color. We don’t need the additional hosted layer any more now that we’ve established that it’s possible to create layers programmatically, so we’ll just set the image directly as the contents of the backing layer of our layerView. 1 shows the updated code. 1 shows the results. 1 An image displayed inside the backing layer of a UIView That was some very simple code, and yet we’ve done something quite interesting here: Using the power of CALayer, we’ve displayed an image inside an ordinary UIView.

When using view-backing layers, you do not need to implement -displayLayer: or -drawLayer:inContext: to draw into your layer’s backing image; you can just implement the -drawRect: method of UIView in the normal fashion, and UIView takes care of everything, including automatically calling -display on the layer when it needs to be redrawn. Summary This chapter explored the layer backing image and its associated properties. You learned to position and crop the image, cut individual images out of a sprite sheet, and to draw layer contents on-the-fly using the CALayerDelegate and Core Graphics.

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