import UIKit
class ViewController: UIViewController{
  @IBOutlet weak var imageView: UIImageView!
  //图片原图
  lazy var originalImage: UIImage = {
    return UIImage(named: "IMG_0473.jpg")
  }()!
  lazy var context: CIContext = {
    return CIContext(options: nil)
    }()
  override func viewDidLoad() {
    super.viewDidLoad()
  }
  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
  }
  //优化图片
  @IBAction func autoAdjustImage(sender: AnyObject) {
    var inputImage = CIImage(image: originalImage)
    let options:[String : AnyObject] = [CIDetectorImageOrientation:1] //图片方向
    let filters = inputImage!.autoAdjustmentFiltersWithOptions(options)
    //遍历所有滤镜，依次处理图像
    for filter: CIFilter in filters {
      filter.setValue(inputImage, forKey: kCIInputImageKey)
      inputImage = filter.outputImage
    }
    let cgImage = context.createCGImage(inputImage!, fromRect: inputImage!.extent)
    self.imageView.image = UIImage(CGImage: cgImage)
  }
  //还原图片
  @IBAction func resetImage(sender: AnyObject) {
     self.imageView.image = originalImage
  }
}

import UIKit
//从相册选取或者拍照需要实现UIImagePickerControllerDelegate UINavigationControllerDelegate
class ViewController: UIViewController ,UIImagePickerControllerDelegate,UINavigationControllerDelegate{
  @IBOutlet weak var imageView: UIImageView!
  var chooseImage: UIImage = UIImage()
  //图片原图
//  lazy var originalImage: UIImage = UIImage(named: "jobZ.png")!
//  
//  lazy var context: CIContext = CIContext(options: nil)
  lazy var context: CIContext = {
    return CIContext(options: nil)
  }()
  override func viewDidLoad() {
//    self.imageView.image = UIImage(named: "jobZ.png")
  }
  //美化图片
  @IBAction func autoAdjustImage(sender: UIButton) {
    var inputImage = CIImage(image: self.chooseImage)
    let options:[String : AnyObject] = [CIDetectorImageOrientation:1] //图片方向
    let filters = inputImage!.autoAdjustmentFiltersWithOptions(options)
    //遍历所有滤镜，依次处理图像
    for filter: CIFilter in filters {
      filter.setValue(inputImage, forKey: kCIInputImageKey)
      inputImage = filter.outputImage
    }
    let cgImage = context.createCGImage(inputImage!, fromRect: inputImage!.extent)
    self.imageView.image = UIImage(CGImage: cgImage)
  }
  //选取图片
  @IBAction func chooseImage(sender: UIButton) {
    if UIImagePickerController.isSourceTypeAvailable(.PhotoLibrary){
      //初始化图片控制器
      let picker = UIImagePickerController()
      //设置代理
      picker.delegate = self
      //指定图片控制器类型 source我这里写的是用拍照,如果想用图库后面值改成UIImagePickerControllerSourceType.PhotoLibrary即可
      picker.sourceType = UIImagePickerControllerSourceType.Camera
      //如果有前置摄像头则调用前置摄像头
      if UIImagePickerController.isCameraDeviceAvailable(UIImagePickerControllerCameraDevice.Front){
        picker.cameraDevice = UIImagePickerControllerCameraDevice.Front
      }
      //弹出控制器，显示界面
      self.presentViewController(picker, animated: true, completion: {
        () -> Void in
      })
    }else{
      print("读取相册错误")
    }
  }
  //还原图片
  @IBAction func resetImage(sender: UIButton) {
    self.imageView.image = self.chooseImage
  }
  //代理
  //选择图片成功后代理
  func imagePickerController(picker: UIImagePickerController,
    didFinishPickingMediaWithInfo info: [String : AnyObject]) {
      //查看info对象
      print(info)
      //获取选择的原图
      let image = info[UIImagePickerControllerOriginalImage] as! UIImage
      self.imageView.image = image
      self.chooseImage = image
      //图片控制器退出
      picker.dismissViewControllerAnimated(true, completion: {
        () -> Void in
      })
  }
}