改变图像的迅速

Question

色调我是新来的迅速和努力基本上实现这一目标， 此图片

此图片 - >

我用这代码from here改变图像的色调，但没有得到所需的输出

func tint(image: UIImage, color: UIColor) -> UIImage 
{ 
    let ciImage = CIImage(image: image) 
    let filter = CIFilter(name: "CIMultiplyCompositing") 

    let colorFilter = CIFilter(name: "CIConstantColorGenerator") 
    let ciColor = CIColor(color: color) 
    colorFilter.setValue(ciColor, forKey: kCIInputColorKey) 
    let colorImage = colorFilter.outputImage 

    filter.setValue(colorImage, forKey: kCIInputImageKey) 
    filter.setValue(ciImage, forKey: kCIInputBackgroundImageKey) 

    return UIImage(CIImage: filter.outputImage)! 
} 

如果这是一个noob问题，道歉。我能够在JavaScript中轻松完成此操作，但不能快速完成。

Answer 1

您好，您可以通过以下方式使用它。首先你使用的UIImage扩展需要一些更新。 您可以斯威夫特3

extension UIImage{ 
func tint(color: UIColor, blendMode: CGBlendMode) -> UIImage 
{ 

    let drawRect = CGRect(x: 0,y: 0,width: size.width,height: size.height) 
    UIGraphicsBeginImageContextWithOptions(size, false, scale) 
    color.setFill() 
    UIRectFill(drawRect) 
    draw(in: drawRect, blendMode: blendMode, alpha: 1.0) 
    let tintedImage = UIGraphicsGetImageFromCurrentImageContext() 
    UIGraphicsEndImageContext() 
    return tintedImage! 
} 
} 

然后在您的viewDidLoad中，你所使用的图像 例如下面的代码复制我使用IBOutlet中imageWood

override func viewDidLoad() { 
    super.viewDidLoad() 
    // Do any additional setup after loading the view, typically from a nib. 
    self.imageWood.image = self.imageWood.image?.tint(color: UIColor.green, blendMode: .saturation) 
} 

像你将不得不使用合适的颜色和图像

另一Extension我发现

extension UIImage { 

// colorize image with given tint color 
// this is similar to Photoshop's "Color" layer blend mode 
// this is perfect for non-greyscale source images, and images that have both highlights and shadows that should be preserved 
// white will stay white and black will stay black as the lightness of the image is preserved 
func tint(_ tintColor: UIColor) -> UIImage { 

    return modifiedImage { context, rect in 
     // draw black background - workaround to preserve color of partially transparent pixels 
     context.setBlendMode(.normal) 
     UIColor.black.setFill() 
     context.fill(rect) 

     // draw original image 
     context.setBlendMode(.normal) 
     context.draw(self.cgImage!, in: rect) 

     // tint image (loosing alpha) - the luminosity of the original image is preserved 
     context.setBlendMode(.color) 
     tintColor.setFill() 
     context.fill(rect) 

     // mask by alpha values of original image 
     context.setBlendMode(.destinationIn) 
     context.draw(self.cgImage!, in: rect) 
    } 
} 

// fills the alpha channel of the source image with the given color 
// any color information except to the alpha channel will be ignored 
func fillAlpha(_ 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.draw(self.cgImage!, in: rect) 
    } 
} 


fileprivate 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! 
} 

}

使用它像这样

self.imageWood.image = self.imageWood.image?.tint(UIColor.purple.withAlphaComponent(1)) 

Answer 2

尝试下面的代码，应该为你工作。

if let myImage = UIImage(named: "imageName")?.withRenderingMode(.alwaysTemplate) { 
     myImageView.image = myImage 
     myImageView.tintColor = UIColor.white 
    } 

Answer 3

您的图像很简单，只有一种颜色。我会建议让图像透明，除了行的位置，然后将其分层在白色背景之上以获得结果。

它看起来像你在使用绘图模式后得到的结果。还有一些核心图像滤镜，可以将图像着色效果应用于图像以及替换特定颜色。对于更复杂的图像来说，这将是一个不错的选择。