swift - Change color of png in buttons - ios

Question

I've got a set of icons that I've created that are transparent white PNGs:

And what I'd like to do is be able to tint them to other colors. Such as blue, grey, etc.

I've noticed that 'clicked/tapped' they change automatically to a grey. So I assume I can change that grey to whatever I like either with a tap or its normal state:

What would be the best way to achieve this?

Answer 1

Following code will set tint colour for normal state of button:

For Swift 4 and newer:

let origImage = UIImage(named: "imageName")
let tintedImage = origImage?.withRenderingMode(.alwaysTemplate)
btn.setImage(tintedImage, for: .normal)
btn.tintColor = .red

You can change tint colour according to your need when state changes for button.

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Older versions

For Swift 3:

let origImage = UIImage(named: "imageName")
let tintedImage = origImage?.withRenderingMode(.alwaysTemplate)
btn.setImage(tintedImage, forState: .normal)
btn.tintColor = .redColor

For Swift 2: see revision history.