Xcode9学习笔记56 - 使用CoreImage框架更改图片的色相 CIHueAdjust

import UIKit
import CoreImage
class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        let image = UIImage(named: "Pic1")
        let imageView = UIImageView(image: image)
        self.view.addSubview(imageView)
        let ciImage = CIImage(image: image!)//初始化一个图片对象，加载之前导入的图片
        let filter = CIFilter(name: "CIHueAdjust")//初始化一个滤镜对象，设置滤镜类型为色相调整滤镜
        filter?.setValue(3.14/6, forKey: kCIInputAngleKey)//设置色相调整滤镜的输入角度值为30度
        filter?.setValue(ciImage, forKey: kCIInputImageKey)//设置需要应用色相调整滤镜的图像
        let outImage = filter?.outputImage//获得应用色相调整滤镜后的图像
        imageView.image = UIImage(ciImage: outImage!)//更改图像视图的内容为应用滤镜后的图像
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}