How to present modal view controller with transparent background

Question

I working with swift and how to how to present modal view controller but his background to be transparent. Content of other view controller to be visible in back.

Answer 1

This one works for me :

self.presentingViewController.providesPresentationContextTransitionStyle = YES;
self.presentingViewController.definesPresentationContext = YES;
modal.modalPresentationStyle = UIModalPresentationOverCurrentContext;