I want to create a CALayer animation that gives sort of a 'flashy' effect. For that I'm trying to animate the 'opacity' property, but my problem is that I have no idea where to start and how to do it.
Here is a graphical explanation of the animation:
opacity
| ___
1 | | |
| | | * repeatCount
0 |___| |_ . . .
-------------------------> time
|______|
duration
The opacity starts at 0, then animates to 1, then to 0 again (this 0-to-1-to-0 animation takes a number of seconds equal to duration). Then this process is repeated 'repeatCount' times.
Here's some background on the code:
float duration = ...; // 0.2 secs, 1 sec, 3 secs, etc
int repeactCount = ...; // 1, 2, 5, 6, ect
CALayer* layer = ...; // I have a CALayer from another part of the code
layer.opacity = 0;
// Animation here
done = YES; // IN THE END of the animation set this ivar to yes
What is the best way to accomplish this? I have never used CALayers before, so this is also a good opportunity to learn how their animation system works. By the way, I have searched the docs and I understand how you add one or two simple animations, but I have no idea how to do this particular one.