I seem to be getting this error for some of my filters. Not all of them.
The crash occures when I choose an image and then select one of these filter types:
- bump distortion
- gaussian blur
- pixellate
- twirl distortion
I've checked the documentation for deprecated values, but I am not seeing any changes... probably something small I'm not seeing?
import CoreImage
import UIKit
class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
@IBOutlet var imageView: UIImageView!
@IBOutlet var intensity: UISlider!
var currentImage: UIImage!
var context: CIContext!
var currentFilter: CIFilter!
override func viewDidLoad() {
super.viewDidLoad()
title = "YACIFP"
navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(importPicture))
context = CIContext()
currentFilter = CIFilter(name: "CISepiaTone")
}
@objc func importPicture() {
let picker = UIImagePickerController()
picker.allowsEditing = true
picker.delegate = self
present(picker, animated: true)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
guard let image = info[.editedImage] as? UIImage else { return }
dismiss(animated: true)
currentImage = image
let beginImage = CIImage(image: currentImage)
currentFilter.setValue(beginImage, forKey: kCIInputImageKey)
applyProcessing()
}
@IBAction func changeFilter(_ sender: UIButton) {
let ac = UIAlertController(title: "Choose filter", message: nil, preferredStyle: .actionSheet)
ac.addAction(UIAlertAction(title: "CIBumpDistortion", style: .default, handler: setFilter))
ac.addAction(UIAlertAction(title: "CIGaussianBlur", style: .default, handler: setFilter))
ac.addAction(UIAlertAction(title: "CIPixellate", style: .default, handler: setFilter))
ac.addAction(UIAlertAction(title: "CISepiaTone", style: .default, handler: setFilter))
ac.addAction(UIAlertAction(title: "CITwirlDistortion", style: .default, handler: setFilter))
ac.addAction(UIAlertAction(title: "CIUnsharpMask", style: .default, handler: setFilter))
ac.addAction(UIAlertAction(title: "CIVignette", style: .default, handler: setFilter))
ac.addAction(UIAlertAction(title: "Cancel", style: .cancel))
if let popOverController = ac.popoverPresentationController {
popOverController.sourceView = sender
popOverController.sourceRect = sender.bounds
}
present(ac, animated: true)
}
func setFilter(action: UIAlertAction) {
// make sure we have a valid image before continuing!
guard currentImage != nil else { return }
// safely read the alert action's title
guard let actionTitle = action.title else { return }
currentFilter = CIFilter(name: actionTitle)
let beginImage = CIImage(image: currentImage)
currentFilter.setValue(beginImage, forKey: kCIInputImageKey)
applyProcessing()
}
@IBAction func save(_ sender: Any) {
guard let image = imageView.image else { return }
UIImageWriteToSavedPhotosAlbum(image, self, #selector(image(_:didFinishSavingWithError:contextInfo:)), nil)
}
@IBAction func intensityChanged(_ sender: Any) {
applyProcessing()
}
func applyProcessing() {
let inputKeys = currentFilter.inputKeys
if inputKeys.contains(kCIInputIntensityKey) { currentFilter.setValue(intensity.value, forKey: kCIInputIntensityKey) }
if inputKeys.contains(kCIInputRadiusKey) { currentFilter.setValue(intensity.value * 200, forKey: kCIInputRadiusKey) }
if inputKeys.contains(kCIInputScaleKey) { currentFilter.setValue(intensity.value * 10, forKey: kCIInputScaleKey) }
if inputKeys.contains(kCIInputCenterKey) { currentFilter.setValue(CIVector(x: currentImage.size.width / 2, y: currentImage.size.height / 2), forKey: kCIInputCenterKey) }
guard let image = currentFilter.outputImage else { return }
currentFilter.setValue(intensity.value, forKey: kCIInputIntensityKey)
if let cgimg = context.createCGImage(image, from: image.extent) {
let processedImage = UIImage(cgImage: cgimg)
imageView.image = processedImage
}
}
@objc func image(_ image: UIImage, didFinishSavingWithError error: Error?, contextInfo: UnsafeRawPointer) {
if let error = error {
let ac = UIAlertController(title: "Save error", message: error.localizedDescription, preferredStyle: .alert)
ac.addAction(UIAlertAction(title: "OK", style: .default))
} else {
let ac = UIAlertController(title: "Saved!", message: "Your altered image has been saved to your photos", preferredStyle: .alert)
ac.addAction(UIAlertAction(title: "OK", style: .default))
present(ac, animated: true)
}
}
}