Set UIImage color

Question

I am on swift 4, and my goal is to change the color of a system UIImage in code. I declare the image with

    let defaultImage = UIImage(systemName: "person.circle.fill")

But when I change its tint color with:

 let grayDefaultImage = defaultImage?.withTintColor(.gray)

The grayDefaultImage still display the standard blue color. Next I use an extension

//MARK: -UIImage extension
extension UIImage {

    /// @Todo: this blurs the image for some reason
    func imageWithColor(color: UIColor) -> UIImage {
        UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
        color.setFill()

        let context = UIGraphicsGetCurrentContext()
        context?.translateBy(x: 0, y: self.size.height)
        context?.scaleBy(x: 1.0, y: -1.0)
        context?.setBlendMode(CGBlendMode.normal)

        let rect = CGRect(origin: .zero, size: CGSize(width: self.size.width, height: self.size.height))
        context?.clip(to: rect, mask: self.cgImage!)
        context?.fill(rect)

        let newImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        return newImage!
    }
}

And the image renders in a very "pixelated" or "low res" form.

KelaKing · Accepted Answer · 2020-04-23 02:55:35Z

1

withTintColor(_:) say: The new image uses the same rendering mode as the original image.

So if original image's rendering mode is .alwaysTemplate, means image will ignoring its color information. you need set mode to .alwaysOriginal:

defaultImage?.withTintColor(.gray, renderingMode: .alwaysOriginal)

answered Apr 23, 2020 at 2:55

KelaKing

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2 Comments

xiaolingxiao Over a year ago

When I do this:

let defaultImage = UIImage(systemName: "person.circle.fill")     defaultImage?.withTintColor(.gray, renderingMode: .alwaysOriginal)     friendView.image = defaultImage

. The image still shows up in the default blue.

KelaKing Over a year ago

@chibro2 withTintColor not change defaultImage, you need use withTintColor return value.

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