Custom icons

[grd888]

Hello,

I added the capability to change several icons with custom images by adding several public variables that can be initialized after PhotoViewController is initialized, something like:

let photoEditor = PhotoEditorViewController(nibName:"PhotoEditorViewController",bundle: Bundle(for: PhotoEditorViewController.self))
photoEditor.cropButtonImage = UIImage(named: 'custom-crop')

[marinofaggiana]

@grd888 good but please, add the reference for cancelButton and cancelButtonImage ;)