June 2011
Intermediate to advanced
590 pages
19h 31m
English
Content preview from iOS Programming: The Big Nerd Ranch Guide, Second Edition
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Bouncing with a CAKeyframeAnimation
For practice with CAKeyframeAnimation, you are going to make the time label grow and shrink to give it a bouncing effect (Figure 23.6).
Figure 23.6 Current time mid-bounce
Remove (or comment out) the spin animation and replace it with a nice bounce. The method showCurrentTime: should look like this:
- (IBAction)showCurrentTime:(id)sender { NSDate *now = [NSDate date]; static NSDateFormatter *formatter = nil; if (!formatter) { formatter = [[NSDateFormatter ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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