presentViewController black background instead of transparent

Question

I have a view that I wish to present to the user in the standard way (sliding up from the bottom of the screen). About half this view is a transparent background and the bottom half has some input fields (imagine the way the keyboard pops up). When I call [self presentViewController] on the rootViewController, it slides the view up, but then about half a second later, where the view used to be transparent it is replaced with black instead. This happens with both presentViewController and presentModalViewController. How to change this behaviour?

Answer 1

This is possible, and rockybalboa provides a solution to this issue in the forum post on raywenderlich.com:

iOS 8 UIModalPresentationCurrentContext is not transparent?

That solution being, quoting balboa's answer, in Objective-C:

Before iOS 8, you do this:

[backgroundViewController setModalPresentationStyle:UIModalPresentationCurrentContext];
[backgroundViewController presentViewController:_myMoreAppsViewController animated:NO completion:nil];

in iOS 8, you have to do this:

backgroundViewController.providesPresentationContextTransitionStyle = YES;
backgroundController.definesPresentationContext = YES;
[overlayViewController setModalPresentationStyle:UIModalPresentationOverCurrentContext];

To supplement the above code with the Swift equivalent:

backgroundViewController.providesPresentationContextTransitionStyle = true
backgroundController.definesPresentationContext = true
overlayViewController.modalPresentationStyle = .OverCurrentContext

Having implemented this using Xcode 6.3 beta 3 on iOS 8.1 with Swift 1.2, it works perfectly.

Just a comment that I viewed three different SO questions on this - the more recent now marked as duplicates - prior to finding and attempting the Ray Wenderlich forum solution.