在Swift 3中以编程方式设置内容过滤器

import CoreImage

let context = CIContext()

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

filter.setValue(image, forKey: kCIInputImageKey) // image为要处理的图像
filter.setValue(1.0, forKey: kCIInputBrightnessKey) // 设置亮度
filter.setValue(0.5, forKey: kCIInputContrastKey) // 设置对比度
filter.setValue(0.0, forKey: kCIInputSaturationKey) // 设置饱和度

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