Please I need help on my problem on swift language

Hello all
I hope all is well
Please i have problem with saving image in document directory
I have to create photo vault in swift language and i save the images in document directory and display the images in my custom collection view my problem is
How can i delete specific image from document directory , how can when i select specific image from my custom collectionView in method didSelect how can i delete this image which i selected it from document directory ( NSFileManager)

Thanks Advance

fm.removeItemAtURL(NSURL) is how to remove the file.
Use URLs to access all the files and the Documents directory.

Thank you very much
I know but i mean i need to select any image and then remove the image in didselectitem in collectionView not all image i know how can i remove all images from path but if i need to select any image and delete it how can i do it ?

Thanks Advance