如何在 Swift 中为 UIImage 着色? [英] How can I color a UIImage in Swift?
本文介绍了如何在 Swift 中为 UIImage 着色?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个名为 arrowWhite
的图像.我想将此图像着色为黑色.
I have an image called arrowWhite
. I want to colour this image to black.
func attachDropDownArrow() -> NSMutableAttributedString {
let image:UIImage = UIImage(named: "arrowWhite.png")!
let attachment = NSTextAttachment()
attachment.image = image
attachment.bounds = CGRectMake(2.25, 2, attachment.image!.size.width - 2.25, attachment.image!.size.height - 2.25)
let attachmentString = NSAttributedString(attachment: attachment)
let myString = NSMutableAttributedString(string: NSString(format: "%@", self.privacyOptions[selectedPickerRow]) as String)
myString.appendAttributedString(attachmentString)
return myString
}
我想以 blackColour
获取此图像.tintColor
不起作用...
I want to get this image in blackColour
.
tintColor
is not working...
推荐答案
Swift 4 和 5
extension UIImageView {
func setImageColor(color: UIColor) {
let templateImage = self.image?.withRenderingMode(.alwaysTemplate)
self.image = templateImage
self.tintColor = color
}
}
这样调用:
let imageView = UIImageView(image: UIImage(named: "your_image_name"))
imageView.setImageColor(color: UIColor.purple)
替代方案对于 Swift 3、4 或 5
extension UIImage {
func maskWithColor(color: UIColor) -> UIImage? {
let maskImage = cgImage!
let width = size.width
let height = size.height
let bounds = CGRect(x: 0, y: 0, width: width, height: height)
let colorSpace = CGColorSpaceCreateDeviceRGB()
let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.premultipliedLast.rawValue)
let context = CGContext(data: nil, width: Int(width), height: Int(height), bitsPerComponent: 8, bytesPerRow: 0, space: colorSpace, bitmapInfo: bitmapInfo.rawValue)!
context.clip(to: bounds, mask: maskImage)
context.setFillColor(color.cgColor)
context.fill(bounds)
if let cgImage = context.makeImage() {
let coloredImage = UIImage(cgImage: cgImage)
return coloredImage
} else {
return nil
}
}
}
对于 Swift 2.3
extension UIImage {
func maskWithColor(color: UIColor) -> UIImage? {
let maskImage = self.CGImage
let width = self.size.width
let height = self.size.height
let bounds = CGRectMake(0, 0, width, height)
let colorSpace = CGColorSpaceCreateDeviceRGB()
let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.PremultipliedLast.rawValue)
let bitmapContext = CGBitmapContextCreate(nil, Int(width), Int(height), 8, 0, colorSpace, bitmapInfo.rawValue) //needs rawValue of bitmapInfo
CGContextClipToMask(bitmapContext, bounds, maskImage)
CGContextSetFillColorWithColor(bitmapContext, color.CGColor)
CGContextFillRect(bitmapContext, bounds)
//is it nil?
if let cImage = CGBitmapContextCreateImage(bitmapContext) {
let coloredImage = UIImage(CGImage: cImage)
return coloredImage
} else {
return nil
}
}
}
这样调用:
let image = UIImage(named: "your_image_name")
testImage.image = image?.maskWithColor(color: UIColor.blue)
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