swift - 在 swift3 中不使用 Uiimageview 更改 UIImage 颜色

Question

我想绘制像星星一样的图像图案，可以为此更改颜色。我可以在不使用 ImageView 的情况下更改图像本身的颜色吗？我看到很多答案改变了 UIImageview 的色调，但效果不适用于 UIImage

Answer 1

谢谢大家的回答，但我得到了解决方案。

func changePatternImageColor() {
    patternImage = UIImage(named: "pattern_star.png")!  //make sure to reinitialize the original image here every time you change the color
    UIGraphicsBeginImageContext(patternImage.size)
    let context = UIGraphicsGetCurrentContext()
    let color = UIColor(red: self.red, green: self.green, blue: self.blue, alpha: self.opacity)
    color.setFill()
    context?.translateBy(x: 0, y: patternImage.size.height)
    context?.scaleBy(x: 1.0, y: -1.0)
    //set the blend mode to color burn, and the original image
    context?.setBlendMode(CGBlendMode.exclusion)  //this does the magic.
    let rect = CGRect(x: 0, y: 0, width: patternImage.size.height, height: patternImage.size.height)
    context?.draw(patternImage.cgImage!, in: rect)
    //set the mask that matches the shape of the image, then draw color burn a colored rectangle
    context?.clip(to: rect, mask: patternImage.cgImage!)
    context?.addRect(rect)
    context?.drawPath(using: CGPathDrawingMode.fill)
    patternImage = UIGraphicsGetImageFromCurrentImageContext()!
    image_ref = patternImage.cgImage
    UIGraphicsEndImageContext()
}

patternImage 是在 Assets 中添加的图像。附言添加到 Assets 中的图案图像应该是黑色