Using definesPresentationContext with UIModalPresentationStyle.custom

Question

I am using view controller containment to manage a set of child view controllers which should be able to modally present other view controllers in a custom manner.

Answer 1

In your UIPresentationController subclass, override shouldPresentInFullscreen as follows:

 override var shouldPresentInFullscreen: Bool {
     get {
         return false
     }
 }

As per the UIPresentationController header:

// By default each new presentation is full screen.
// This behavior can be overriden with the following method to force a current context presentation.
// (Default: YES)
@property(nonatomic, readonly) BOOL shouldPresentInFullscreen;

This along with definesPresentationContext should do the trick.