objective c - ios: change the colors of a UIImage

Question

I am working on an Iphone application.

I have png pictures that represents symbols. symbols are all black with a transparent background.

Is there a way I can turn the black color into another one? What I'm looking for is something that can help me choose the color I want and when using the symbols (in a UIImage) I can make them appear the color of my choice.

I have searched around and found a framework called OpenCV that can manipulate images but I cant find out how to recolor the picture.

Any help and suggestion is greatly appreciated.

Thank you

Answer 1

The easiest and shortest:

Way to do that in case when you dealing with UIImageView:

Obj-C:

theImageView.image = [theImageView.image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
[theImageView setTintColor:[UIColor redColor]];

Swift:

let theImageView = UIImageView(image: UIImage(named:"foo")!.imageWithRenderingMode(UIImageRenderingMode.AlwaysTemplate))
theImageView.tintColor = UIColor.redColor()