Apple is introducing a new contacts framework in iOS 9. The do so very aggressively to even replace view controllers from AddressBookUI.framework with their new implementations. Unfortunately not without problems.
Normally I am prefer to keep quiet about bugs in iOS beta versions, but this one affects apps public on the app store which are using this view controller and therefore I felt it necessary to warn my iOS developer colleagues about it. This is the crash I was alluding to on iOS Today.
rdar://21357089 – ABUnknownPersionViewController_modern overreleases CNContactViewController
rdar://21438771 – ABUnknownPersionViewController Regression
ABUnknownPersionViewController_modern overreleases CNContactViewController
Summary
ABUnknownPersionViewController “modern” implementation tries to release an already-released ABUnknownPersionViewController CNContactViewController, the second time it is popped off a navigation controller.
Steps to Reproduce
- Present an ABUnknownPersionViewController on a navigation controller
- Go back
- Present it again
- Go back
Expected Results
- No crash
Actual Results
- Crash
Enabling Zombies, you get -[CNContactViewController release]: message sent to deallocated instance 0x161aae650 from ABUnknownPersionViewController_modern’s -dealloc.
ABUnknownPersionViewController Regression
Summary
When presenting an ABUnknownPersionViewController on a UINavigationController there are two visual glitches. This is a regression. Running on iOS 8 or built with the iOS 8 SDK these glitches don’t occur.
Steps to Reproduce
- Run the provided sample app on iOS 9 simulator.
- Click on the center button
Expected Results
- the presented view controller should appear, correctly laid out
- just like in iOS 8
Actual Results
- before any content of the presented view controller appears, there is a black background visible
- after a short pause the content appears
- but it goes behind the navigation bar because it does not obey the topLayoutGuide
Notes
Apparently you changed the internal implementation of ABUnknownPersionViewController to use a controller from the new Contacts framework. Your implementation seems to not take the use case into account which is shown by the sample app.
iOS 8 vs iOS 9
The mentioned app for both is the ABUnknownPersionViewControllerBug project on my Radar Samples GitHub repo.
Categories: Bug Reports
