Xcode9學習筆記57 - 使用CoreImage框架給圖片添加馬賽克效果 CIPixellate

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!)//初始化一個圖像對象並加載之前導入的圖片
        let filter = CIFilter(name: "CIPixellate")//初始化一個濾鏡對象，並設置濾鏡類型爲像素化濾鏡
        filter?.setDefaults()//設置像素畫濾鏡採用默認的配置選項
        filter?.setValue(ciImage, forKey: kCIInputImageKey)//設置需要應用像素化濾鏡的圖像
        let outImamge = filter?.outputImage//獲得應用像素化濾鏡後的圖像
        
        imageView.image = UIImage(ciImage: outImamge!)//更改圖像視圖的內容爲應用濾鏡後的圖像
    }

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