https://www.hackingwithswift.com/100/52
Includes solutions to the challenges.
UISlider, UIImagePickerController, CIContext, CIFilter, Saving photos
From Hacking with Swift:
- Try making the Save button show an error if there was no image in the image view.
- Make the Change Filter button change its title to show the name of the currently selected filter.
- Experiment with having more than one slider, to control each of the input keys you care about. For example, you might have one for radius and one for intensity.
