如何在iOS中检测UIImage的颜色

Question

I have a view like this :

The left back button & the right button is basically two white image (set in UIButton ) with a particular opacity. Now it's look more or less visible on this background cover photo.

But if I change the background cover photo with something else, where the opacity & color of that cover image is closer to the two button's image, then it's difficult to see those two button.

Like this:

So I just wondering, Is there any way, so that I can detect the color of my cover image and I can change those two buttons image or color according to it?

Any kind of reference or guidance would be very much appreciable.

Answer 1

I think you can use this function to determinate how light/dark is the background. Calculate an average of several pixel under your button.

Have fun! :D