Changing the brightness of iphone screen programmatically?

Question

Possible Duplicate:
Is there a way of adjusting the screen brightness programmatically?
iPhone: How can we programmatically change the brightness of the screen?

How can we change (Decrease and increase) Brightness of the iphone screen programmatically by touch events?

Answer 1

A Float value of 0 - 1 can be used to do this, for example:

[[UIScreen mainScreen] setBrightness: 0.5f];