Unable to define modalPresentationContext with custom transition

Number:rdar://31163999 Date Originated:3/20/2017
Status:Open Resolved:
Product:iOS + SDK Product Version:
Classification:Serious Bug Reproducible:Always
GitHub Sample Code: https://github.com/brianmichel/CustomTransitionFailure

Setting definesPresentationContext has no effect when using a custom view controller transition and presentation controller. This means that it is impossible to achieve custom presentations that mimic the behavior of "modalPresentationStyle = currentContext" or the like.

Steps to Reproduce:
1. Download the sample project
2. Run the project and tap on the orange view

Expected Results:
Since the tapped view controller (OtherViewController) defines it’s own presentation context (ViewController.swift:146) I expect that the presented view controller can be presented within the bounds of the presenting view controller.

Actual Results:
The presented view controller’s transition view is inserted higher up in the view hierarchy due to the inability of custom presentation controllers to respect custom presentation contexts.

As a test, you can override the private value on ViewController.swift:85 with a value of true to see the desired behavior.

iOS 10.3 (14E5273a)


iPhone 7 Plus, 128 GB

'CustomTransitionFailure Compressed.zip' was successfully uploaded.


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