import UIKit
//导入CoreImage框架,该框架提供大量高效的图像处理功能,用来对基于像素的图像进行分析,操作和特效处理
import CoreImage
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let image = UIImage(named: "img1")
let imageView = UIImageView(image: image)
imageView.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height)
self.view.addSubview(imageView)
// 初始化一个CoreImage对象,并加载之前导入的图片
let ciImage = CIImage(image: image!)
// 初始化一个颜色对象(参数值在0和1之间,alpha透明度)
let color = CIColor(red: 0.8, green: 0.6, blue: 0.4, alpha: 0.5)
// 初始化一个滤镜对象,并设置为单色调滤镜
let filter = CIFilter(name: "CIColorMonochrome")
// 输入单色调的颜色值
filter?.setValue(color, forKey: kCIInputColorKey)
// 设置单色调颜色的浓度值
filter?.setValue(1.0, forKey: kCIInputIntensityKey)
// 设置单色调滤镜的图像
filter?.setValue(ciImage, forKey: kCIInputImageKey)
// 获得应用单色调滤镜后的图像
let outImage = filter?.outputImage
// 更该图像视图的内容为应用滤镜后的图像
imageView.image = UIImage(ciImage: outImage!)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}