Exploring CALayer Features

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Questions and Answers

What are some features of CALayer that are not exposed by UIView?

  • 3D transforms and positioning (correct)
  • Border colors and rounded corners
  • Multistep, linear animations
  • Rectangular bounds

How can you apply a drop shadow to a view in iOS?

  • By utilizing CALayer's features (correct)
  • By changing the background color property of the view
  • By using UIView's built-in method
  • By subclassing UIView

What is one way to achieve nonrectangular bounds for a visual element?

  • Setting the frame property of the view
  • Using UIView's default settings
  • Applying a mask to the content (correct)
  • Using a container view

Why would you choose to work with CALayer over UIView for certain effects?

<p>CALayer provides better performance for complex animations (D)</p> Signup and view all the answers

What benefit does CALayer offer in terms of animations compared to UIView?

<p>CALayer allows for non-linear animations (D)</p> Signup and view all the answers

How can you create a colored border around a view in an iOS app?

<p>By using CALayer's features to customize the border (C)</p> Signup and view all the answers

What is responsible for managing rendering, layout, and animation in iOS?

<p>CALayer (D)</p> Signup and view all the answers

Which iOS class is conceptually very similar to UIView in handling rectangular objects arranged hierarchically?

<p>CALayer (B)</p> Signup and view all the answers

What feature of UIView is not handled by CALayer when it comes to user interaction?

<p>User interaction (D)</p> Signup and view all the answers

Which mechanism in iOS propagates touch events through the view hierarchy but is not handled by CALayer?

<p>Responder chain (C)</p> Signup and view all the answers

In terms of managing layers and sublayers, which component is aware of parallel hierarchies in iOS?

<p>UIView (A)</p> Signup and view all the answers

Which element in iOS has methods and properties for animations, transforms, and position management similar to UIView?

<p>CALayer (B)</p> Signup and view all the answers

In Mac OS 10.8, what is a benefit of using a layer-backed view instead of a hosted CALayer?

<p>Access to both low-level CALayer and high-level UIView features (B)</p> Signup and view all the answers

Why might you still want to use a hosted CALayer instead of a layer-backed UIView in a real-world application?

<p>To make cross-platform code compatible with Mac (A)</p> Signup and view all the answers

When might you choose to use a hosted CALayer instead of a layer-backed UIView according to the text?

<p>When developing specialized CALayer subclasses (C)</p> Signup and view all the answers

What makes layer-backed views easier to work with compared to hosted layers?

<p>Integration of high-level UIView APIs (A)</p> Signup and view all the answers

What kind of work might justify the use of a hosted CALayer for performance reasons according to the text?

<p>Complex graphics operations (C)</p> Signup and view all the answers

When is it recommended to use OpenGL for drawing, based on the text?

<p>When doing performance-critical work that involves drawing (A)</p> Signup and view all the answers

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