如果我将CIFilter应用于CIImage，应用程序崩溃 - Swift 2.0

Question

我有这个奇怪的问题，我无法解决。如果我用我的应用程序拍摄照片并将CIFilter应用于其上，则一切正常，但如果我拍摄另一张照片并应用相同的滤镜，则我的应用程序会崩溃而不会出现任何错误。但奇怪的是，我可以使用相机胶卷上的图像进行相同的处理，并且该应用程序完美无缺。

let context = CIContext(options: nil) 

func processImage(image: UIImage, colors: Int) -> UIImage{ 

    var img1:CIImage = CIImage(image: image)! 
    img1 = img1.imageByApplyingFilter("CIPhotoEffectMono", withInputParameters:["inputImage" : img1]) 
    img1 = img1.imageByApplyingFilter("CISharpenLuminance", withInputParameters: ["inputImage" : img1]) 
    img1 = img1.imageByApplyingFilter("CIColorPosterize", withInputParameters: ["inputImage" : img1, "inputLevels" : colors]) 
    img1 = img1.imageByApplyingFilter("CIColorControls", withInputParameters: ["inputImage" : img1, "inputSaturation" : 1, "inputBrightness": 0.2, "inputContrast": 1.5 //8 
     ]) 
    img1 = img1.imageByApplyingFilter("CIHighlightShadowAdjust", withInputParameters: ["inputImage" : img1, "inputHighlightAmount": 6, "inputShadowAmount": 0]) 
    img1 = img1.imageByApplyingFilter("CIColorPosterize", withInputParameters: ["inputImage" : img1, "inputLevels" : 3]) 


    let cgImg = context.createCGImage(img1, fromRect: img1.extent) 

    let uiImg = UIImage(CGImage: cgImg, scale: 1.0, orientation: image.imageOrientation) 
    print("x") 
    return uiImg 
} 

我已经看过了内存的使用，如果我用图像从相机我的应用程序使用了约40％，而它崩溃，：

//CAMERA 

@IBOutlet weak var imageView: UIImageView! 

var selectedImage: UIImage!  

@IBAction func rollButtonPressed(sender: UIBarButtonItem) { 
    let picker = UIImagePickerController() 

    picker.delegate = self 
    picker.sourceType = .PhotoLibrary 

    self.presentViewController(picker, animated: true, completion: nil) 
} 

@IBAction func cameraButtonPressed(sender: UIBarButtonItem) { 
    if UIImagePickerController.isSourceTypeAvailable(.Camera){ 

     let camera = UIImagePickerController() 
     camera.delegate = self 
     camera.allowsEditing = false 
     camera.sourceType = UIImagePickerControllerSourceType.Camera 
     camera.showsCameraControls = true 

     camera.cameraOverlayView?.layer.borderWidth = 3 
     camera.cameraOverlayView?.layer.borderColor = UIColor.redColor().CGColor 
     camera.cameraOverlayView?.frame = CGRectMake(self.view.frame.minX, self.view.frame.midY - self.view.frame.width/8, self.view.frame.width, self.view.frame.width/4) 


     self.presentViewController(camera, animated: true, completion: nil) 
    } 

} 

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) { 

    self.dismissViewControllerAnimated(true, completion: nil) 

    selectedImage = (info[UIImagePickerControllerOriginalImage] as! UIImage) 

    for var i = 2; i <= 10; i++ { 
     imageView.image = processImage(selectedImage, colors: i) 
    } 

} 

引起该问题的函数但如果我从相机胶卷中选择图像，我只能获得最大。 8％的RAM使用率。

如果你知道为什么，如果你能留下答案，我会非常高兴。

Answer 1

我不得不在processImage的开头添加image = UIImage(data: UIImageJPEGRepresentation(image, 0.9)!)!，因为我的图片很大。

Answer 2

由于createCGImage，您的内存不足。

我processImage功能工作：

func processImage(image: UIImage, colors: Int) -> UIImage{ 
    var img1:CIImage = CIImage(image: image)! 
    img1 = img1.imageByApplyingFilter("CIPhotoEffectMono", withInputParameters:["inputImage" : img1]) 
    img1 = img1.imageByApplyingFilter("CISharpenLuminance", withInputParameters: ["inputImage" : img1]) 
    img1 = img1.imageByApplyingFilter("CIColorPosterize", withInputParameters: ["inputImage" : img1, "inputLevels" : colors]) 
    img1 = img1.imageByApplyingFilter("CIColorControls", withInputParameters: ["inputImage" : img1, "inputSaturation" : 1, "inputBrightness": 0.2, "inputContrast": 1.5 //8 
     ]) 
    img1 = img1.imageByApplyingFilter("CIHighlightShadowAdjust", withInputParameters: ["inputImage" : img1, "inputHighlightAmount": 6, "inputShadowAmount": 0]) 
    img1 = img1.imageByApplyingFilter("CIColorPosterize", withInputParameters: ["inputImage" : img1, "inputLevels" : 3]) 

    let uiImg = UIImage(CIImage: img1) 
    print("x") 
    return uiImg ?? UIImage() 
} 

而且我会做回UIImage的类型可选。你永远不知道它是否会被处理。更好地检查。