CHAPTER 13 EXERCISE SOLUTIONS
Answer to Question 1
The three affine transformations are translation, rotation, and scaling.
Answer to Question 2
The only way to pause the NSTimer object is to call its invalidate method. To resume it, you have to create a new NSTimer object.
Answer to Question 3
The animatingWithDuration:animations: method of the UIView class enables you to enclose a block of code that causes visual changes to your views, such that the changes in visual appearance will be animated, and not appear choppily.
Answer to Question 4
You can play a video using the MPMoviePlayerController class.
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