ios – 在Swift中使用CIColorMatrix过滤器

概述以下 Swift函数应该使用指定的’tintColor’为灰度图像’greyImage’着色： import UIKitfunc colorizeImage(greyImage : UIImage, tintColor : UIColor) -> UIImage? { let colorMatrixFilter = CIFilter(name: "CIColorMatrix") 以下 Swift函数应该使用指定的’tintcolor’为灰度图像’greyImage’着色：

import UIKitfunc colorizeImage(greyImage : UIImage,tintcolor : UIcolor) -> UIImage? {    let colorMatrixFilter = CIFilter(name: "CIcolorMatrix")    var r:CGfloat = 0    var g:CGfloat = 0    var b:CGfloat = 0    var a:CGfloat = 0    tintcolor.getRed(&r,green:&g,blue:&b,Alpha:&a)    colorMatrixFilter.setDefaults()    colorMatrixFilter.setValue(greyImage,forKey:"inputimage") //kCIInputimageKey)    colorMatrixFilter.setValue(CIVector(x:r,y:0,z:0,w:0),forKey:"inputRVector")    colorMatrixFilter.setValue(CIVector(x:0,y:g,forKey:"inputGVector")    colorMatrixFilter.setValue(CIVector(x:0,z:b,forKey:"inputBVector")    colorMatrixFilter.setValue(CIVector(x:0,w:a),forKey:"inputAVector")    if let ciImage =  colorMatrixFilter.outputimage {        return UIImage(CIImage: ciImage);    }    return nil;}

颜色为UIcolor.orangecolor()(r = 1,g = 0.5,b = 0,a = 1),灰度图像正常,因为它在送到ImageVIEw时可以正确显示.

看起来提供了所有必需的密钥并且密钥分配顺利进行(BTW过滤器检查密钥的有效性,还是采取一切措施？),但是读取’outputimage’属性会产生SIGABRT和以下控制台消息：

2015-05-02 13:04:07.319 MyApp[436:8241] -[UIImage _internalRepresentation]: unrecognized selector sent to instance 0x7fd5b3ca82b02015-05-02 13:04:07.629 MyApp[436:8241] *** Terminating app due to uncaught exception 'NSinvalidargumentexception',reason: '-[UIImage _internalRepresentation]: unrecognized selector sent to instance 0x7fd5b3ca82b0'*** First throw call stack:(    0   CoreFoundation                      0x00000001087abf35 __exceptionPreprocess + 165    1   libobjc.A.dylib                     0x000000010a56cbb7 objc_exception_throw + 45    2   CoreFoundation                      0x00000001087b304d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205    3   CoreFoundation                      0x000000010870b27c ___forwarding___ + 988    4   CoreFoundation                      0x000000010870ae18 _CF_forwarding_prep_0 + 120    5   CoreImage                           0x0000000108bd30fe -[CIcolorMatrix outputimage] + 885    6   MyApp                            0x00000001085c182d _TF8MyApp13colorizeImageFTCSo7UIImageCSo7UIcolor_GSqS0__ + 4733    7   MyApp                            0x00000001085c2b59

解决方法 问题是 CIColorMatrix期望参数inputimage应该是CIImage对象而不是UIImage(greyImage).

更新：Swift 3或更高版本

extension UIImage {    func colorized(with color: UIcolor) -> UIImage? {        guard            let ciimage = CIImage(image: self),let colorMatrix = CIFilter(name: "CIcolorMatrix")        else { return nil }        var r: CGfloat = 0,g: CGfloat = 0,b: CGfloat = 0,a: CGfloat = 0        color.getRed(&r,green: &g,blue: &b,Alpha: &a)        colorMatrix.setDefaults()        colorMatrix.setValue(ciimage,forKey: "inputimage")        colorMatrix.setValue(CIVector(x: r,y: 0,z: 0,w: 0),forKey: "inputRVector")        colorMatrix.setValue(CIVector(x: 0,y: g,forKey: "inputGVector")        colorMatrix.setValue(CIVector(x: 0,z: b,forKey: "inputBVector")        colorMatrix.setValue(CIVector(x: 0,w: a),forKey: "inputAVector")        if let ciimage = colorMatrix.outputimage {            return UIImage(ciImage: ciimage)        }        return nil    }}

let profilePicture = UIImage(data: try!  Data(contentsOf: URL(string: "http://i.stack.imgur.com/Xs4RX.jpg")!))!profilePicture.colorized(with: .orange)

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