Xcode9学习笔记57

import UIKit
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: "Pic1")
        let imageView = UIImageView(image: image)
        self.view.addSubview(imageView)
        
        let ciImage = CIImage(image: image!)//初始化一个图像对象并加载之前导入的图片
        let filter = CIFilter(name: "CIPixellate")//初始化一个滤镜对象，并设置滤镜类型为像素化滤镜
        filter?.setDefaults()//设置像素画滤镜采用默认的配置选项
        filter?.setValue(ciImage, forKey: kCIInputImageKey)//设置需要应用像素化滤镜的图像
        let outImamge = filter?.outputImage//获得应用像素化滤镜后的图像
        
        imageView.image = UIImage(ciImage: outImamge!)//更改图像视图的内容为应用滤镜后的图像
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}