IOS 使用Core Image做单色调效果

1 import UIKit 2 import CoreImage 3 4 class ViewController：UIViewController { 5 6 override func viewDidLoad() { 7 super.viewDidLoad() 8 9 let option = Dictionary(dictionaryLiteral： (kCIContextUseSoftwareRenderer, true)) 10 let context = CIContext(options：option) 11 let image = UIImage(named：“Pic1”) 12 let imageView = UIImageView(image：image) 13 14 let filter = CIFilter(name：“CIColorMonochrome”) 15 let ciImage = CIImage(image：image！) 16 let color = CIColor(red：0.8, green：0.6, blue：0.4) 17 filter？.setValue(color, forKey：kCIInputColorKey) 18 filter？.setValue(1.0, forKey：kCIInputIntensityKey) 19 filter？.setValue(ciImage, forKey：kCIInputImageKey) 20 21 let resltImage = filter？.outputImage 22 let outImage = context.createCGImage((filter？.outputImage)！, from： (resltImage？.extent)！) 23 imageView.image = UIImage(cgImage：outImage！) 24 self.view.addSubview(imageView) 25 } 26 }