CoreImage CIImage无效

Question

Core Image无效：

    let fileUrl = Bundle.main.url(forResource: "image", withExtension: "png")

    let begainImage = CIImage(contentsOf: fileUrl!)

    let filter = CIFilter(name: "CISepiaTone")
    filter?.setValue(begainImage, forKey: kCIInputImageKey)
    filter?.setValue(0.5, forKey: kCIInputImageKey)

    let newImage = UIImage(ciImage: (filter!.outputImage)!)

    self.imageView.image = newImage

Answer 1

因为你写道：

filter?.setValue(0.5, forKey: kCIInputImageKey)

而不是

filter?.setValue(0.5, forKey: kCIInputIntensityKey)