Blurred footprint
extension uiimage
public func modifiedImage(_ draw: (CGContext, CGRect) -> ()) -> UIImage {
// using scale correctly preserves retina images
UIGraphicsBeginImageContextWithOptions(size, false, scale)
let context: CGContext! = UIGraphicsGetCurrentContext()
assert(context != nil)
// correctly rotate image
context.translateBy(x: 0, y: size.height)
context.scaleBy(x: 1.0, y: -1.0)
let rect = CGRect(x: 0.0, y: 0.0, width: size.width, height: size.height)
draw(context, rect)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image!
}
public func tintPictogram(with fillColor: UIColor) -> UIImage {
return modifiedImage { context, rect in
// draw tint color
context.setBlendMode(.normal)
fillColor.setFill()
context.fill(rect)
// mask by alpha values of original image
context.setBlendMode(.destinationIn)
context.setAlpha(0.15)
context.draw(cgImage!, in: rect)
}
}general:
func blurImage(_ image:UIImage) -> UIImage? {
let context = CIContext(options: nil)
let inputImage = CIImage(image: image)
let originalOrientation = image.imageOrientation
let originalScale = image.scale
let filter = CIFilter(name: "CIGaussianBlur")
filter?.setValue(inputImage, forKey: kCIInputImageKey)
filter?.setValue(3.0, forKey: kCIInputRadiusKey)
let outputImage = filter?.outputImage
var cgImage:CGImage?
if let asd = outputImage
{
cgImage = context.createCGImage(asd, from: (inputImage?.extent)!)
}
if let cgImageA = cgImage
{
return UIImage(cgImage: cgImageA, scale: originalScale, orientation: originalOrientation)
}
return nil
}use:
if let image = UIImage(named:name)
{
let tintimg = image.tintPictogram(with: .black)
if let shadowedimage = blurImage(tintimg){
//... shadowImages.append(shadowedimage)
}
}