如何在swift 3中启用图像滤镜？

import CoreImage

let context = CIContext()

guard let inputImage = CIImage(image: yourImage) else { return }

guard let filter = CIFilter(name: "CIFilterName") else { return }

filter.setValue(inputImage, forKey: kCIInputImageKey)

filter.setValue(0.5, forKey: kCIInputIntensityKey)

guard let outputImage = filter.outputImage else { return }

guard let cgImage = context.createCGImage(outputImage, from: outputImage.extent) else { return }
let filteredImage = UIImage(cgImage: cgImage)