Saving battery

[Alex_R]

Thanks guys for your solutions!!.

When I set LIMITFPS 10 and SLEEP 1 it seems it save battery but I have a little problem. When user taps any button sometimes must do two or three touches with all finger in the screen till the game do something. I think due to SLEEP 1. If I remove the SLEEP command this problem is not solved but the behavior is aceptable (sometimes two taps is required to activate the game). So I need at least 30 FPS to check the user taps for a fine user experience. I'll try kanonet solution. I think it solves this problem.

Thank you again for your help!! This forum is awsome!! 

[Kitty Hello]

Did you try HIBERNATE? That's a sort of an "intelligent SLEEP".

[Alex_R]

After some little testing with Apple developer tools I have the following results (perhaps can be useful to someone).

Special loop: When user is no tapping the screen the program goes to this special loop doing hibernate, sleep or other test as follows:

Procedure    CPU usage    GPU usage    Touch response
30 fps always   29%-56%   7%-8%   Very good: 10/10

Special loop
Hibernate
No showscreen   50%-51%   0%   Good :8/10

Special loop
Hibernate
Sleep 50
No showscreen   46%   0%   Good :8/10

Special loop
Hibernate
8 FPS reduction
No showscreen   50%-51%   0%   Regular :7/10

Special loop
No hibernate
8 FPS reduction
No showscreen   20%   20-21%   Bad: 4/10

Special loop
Screenshot
Sleep 50
Showscreen   28-29%   11%   Bad: 4/10

Special loop
Screenshot
Hibernate
Showscreen   18%   25%   Very Bad: 4/10

Special loop
Screenshot
8 FPS reduction
Showscreen   18%-21%   19%-25%   Very bad: 3/4


Conclusion: unfortunately the best option is do nothing to save battery. You get the best user experience and the game runs fine.

Note: with this special loop the iPhone gets too warm after 5 minutes.
Note2: with hibernate after showscreen in the main loop I get almost the same CPU and GPU usage that without hibernate

[spacefractal]

more fps you have, why better control do you have. This is why some users want 60fps, even its a simple game. That is just more responsetive. So there is no reasons to try to save the battery state, except if the user is idle, example like 5 minuttes or such (which im did in Spot Race).