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Swift UIImage extension for tinting images
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| /** | |
| Usage: | |
| let originalImage = UIImage(named: "cat") | |
| let tintedImage = originalImage.tintWithColor(UIColor(red: 0.9, green: 0.7, blue: 0.4, alpha: 1.0)) | |
| */ | |
| extension UIImage { | |
| func tintWithColor(color:UIColor)->UIImage { | |
| UIGraphicsBeginImageContext(self.size) | |
| let context = UIGraphicsGetCurrentContext() | |
| // flip the image | |
| CGContextScaleCTM(context, 1.0, -1.0) | |
| CGContextTranslateCTM(context, 0.0, -self.size.height) | |
| // multiply blend mode | |
| CGContextSetBlendMode(context, kCGBlendModeMultiply) | |
| let rect = CGRectMake(0, 0, self.size.width, self.size.height) | |
| CGContextClipToMask(context, rect, self.CGImage) | |
| color.setFill() | |
| CGContextFillRect(context, rect) | |
| // create uiimage | |
| let newImage = UIGraphicsGetImageFromCurrentImageContext() | |
| UIGraphicsEndImageContext() | |
| return newImage | |
| } | |
| } | |
Swift 3 with cap insets from original image (image will resize the way you set insets):
extension UIImage {
func tint(with color: UIColor) -> UIImage {
UIGraphicsBeginImageContextWithOptions(self.size, false, UIScreen.main.scale)
guard let context = UIGraphicsGetCurrentContext() else { return self }
// flip the image
context.scaleBy(x: 1.0, y: -1.0)
context.translateBy(x: 0.0, y: -self.size.height)
// multiply blend mode
context.setBlendMode(.multiply)
let rect = CGRect(x: 0, y: 0, width: self.size.width, height: self.size.height)
context.clip(to: rect, mask: self.cgImage!)
color.setFill()
context.fill(rect)
// create UIImage
guard let newImage = UIGraphicsGetImageFromCurrentImageContext() else { return self }
UIGraphicsEndImageContext()
return newImage.resizableImage(withCapInsets: self.capInsets, resizingMode: self.resizingMode)
}
}
Omit self when you don't need it:
func setTint(_ color: UIColor) -> UIImage {
defer { UIGraphicsEndImageContext() }
UIGraphicsBeginImageContextWithOptions(size, false, UIScreen.main.scale)
guard let context = UIGraphicsGetCurrentContext() else { return self }
// flip the image
context.scaleBy(x: 1.0, y: -1.0)
context.translateBy(x: 0.0, y: -size.height)
// multiply blend mode
context.setBlendMode(.multiply)
let rect = CGRect(x: 0, y: 0, width: size.width, height: size.height)
context.clip(to: rect, mask: cgImage!)
color.setFill()
context.fill(rect)
// create UIImage
guard let newImage = UIGraphicsGetImageFromCurrentImageContext() else { return self }
return newImage
}
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Swift 4: