I wanted to do the same thing, to ensure visibility of the info button.
So I made 2 UIButtons with the same position, linked to the same IBAction. (Yah, you guessed right: “btnInfoDark” of type ‘Info Dark’, and “btnInfoLight” of type ‘Info Light’)

When I had a dark background I hid btnInfoDark with .btnInfoDark.hidden = TRUE; and did the same for the light background .btnInfoLight.hidden = TRUE;
I was setting the view background with self.backgroundColor = [UIColor ], so I knew the background color. But you could also get the background of the object/view behind by checking its .background property.

Finding out when the color is somewhat dark or light remains another matter. Maybe this thread can help you calculate the darkness of a given color: http://stackoverflow.com/questions/596216/formula-to-determine-brightness-of-rgb-color.

PS
cmdButton.doThisExtremelyCommonThingForMeToo = TRUE

I set my view’s color… but how do I tell if it’s “kind of light” or “kind of dark”?

Besides… I can’t change the info-button from light to dark anyway. (read only)

Ugh.

Shouldn’t Apple have some kind of a simple “cmdButton.doThisExtremelyCommonThingForMe = TRUE” statement?

InfoButtons are useless if you can’t even see them.

thanks thanks thanks … :) :) :)

[button setAlpha: 1.0f];

[UIView beginAnimations: nil context:NULL];
// time delay in seconds to start
[UIView setAnimationDelay:2.0f];
// time in seconds for the fading, 0.25sec is the default apple time for small animations
[UIView setAnimationDuration:0.25f];
[UIView setAnimationBeginsFromCurrentState: YES];
[button setAlpha: 0.0f];
[UIView commitAnimations];

How to fade out info button after some seconds ???

any example code plzz..

I am saying this because I used IB to create my interface, added the code at the beginning of viewDidLoad and it works like a charm…