Created
April 7, 2017 04:17
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UIImage+Colorizable – paint image with color
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internal extension UIImage { | |
private static let kSubstrateCircleDiameter: CGFloat = 24.0 | |
/// Возвращает картинку, покрашенную в цвет color | |
internal func colorized(with color: UIColor?) -> UIImage { | |
guard let color = color else { return self } | |
UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale) | |
let context = UIGraphicsGetCurrentContext()! | |
context.translateBy(x: 0.0, y: self.size.height) | |
context.scaleBy(x: 1.0, y: -1.0) | |
context.setBlendMode(.normal) | |
let rect = CGRect(x: 0.0, y: 0.0, width: self.size.width, height: self.size.height) | |
context.clip(to: rect, mask: self.cgImage!) | |
color.setFill() | |
context.fill(rect) | |
let colorizedImage = UIGraphicsGetImageFromCurrentImageContext()! | |
UIGraphicsEndImageContext() | |
return colorizedImage | |
} | |
/// Возвращает картинку нарисованную на кружке цвета color, диаметром 24 | |
internal func substrated(with color: UIColor?) -> UIImage { | |
guard let color = color else { return self } | |
let substrateSize = CGSize(width: UIImage.kSubstrateCircleDiameter, | |
height: UIImage.kSubstrateCircleDiameter) | |
// Рисуем кружок нужного цвета | |
UIGraphicsBeginImageContextWithOptions(substrateSize, false, UIScreen.main.scale) | |
let ctx = UIGraphicsGetCurrentContext()! | |
ctx.saveGState() | |
let rect = CGRect(origin: CGPoint(x: 0.0, y: 0.0), size: substrateSize) | |
ctx.setFillColor(color.cgColor) | |
ctx.fillEllipse(in: rect) | |
// Поверх кружка рисуем иконку по центру кружка | |
let overlayOrigin = CGPoint.init(x: substrateSize.width / 2.0 - self.size.width / 2.0, | |
y: substrateSize.height / 2.0 - self.size.height / 2.0) | |
let overlayRect = CGRect.init(origin: overlayOrigin, size: self.size) | |
// Переворачиваем контекст в нужную систему координат (флипаем иконку по y) | |
ctx.translateBy(x: 0.0, y: substrateSize.height) | |
ctx.scaleBy(x: 1.0, y: -1.0); | |
ctx.draw(self.cgImage!, in: overlayRect) | |
// И обратно ради хорощего тона | |
ctx.translateBy(x: 0.0, y: -overlayRect.size.height) | |
ctx.scaleBy(x: 1.0, y: -1.0); | |
ctx.restoreGState() | |
// Сливаем всё в итоговую картинку | |
let resultImage = UIGraphicsGetImageFromCurrentImageContext()! | |
UIGraphicsEndImageContext() | |
return resultImage | |
} | |
} |
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