There’s already a radar filed for this (I don’t know if there’s a JIRA bug though).
The problem is that the standard library’s reflection mechanism only knows how to map the in-memory representation of an enum to a case name for native Swift enums. Objective-C enums are represented by their ‘raw value’, and we don’t store the mapping in a way that’s accessible to the reflection code. Slava > On Jul 17, 2017, at 3:33 PM, Alex Blewitt via swift-users > <swift-users@swift.org> wrote: > >> On 17 Jul 2017, at 15:15, Michael Rogers via swift-users >> <swift-users@swift.org <mailto:swift-users@swift.org>> wrote: >> >> Hi, All: >> >> Can someone please enlighten me as to why the first enum works as expected, >> giving me Melbourne, but the second gives UIModalPresentationStyle rather >> than fullScreen? > > Sure - it's because it's an alias that is imported via Objective-C rather > than defined in Swift: > > typedef NS_ENUM(NSInteger, UIModalPresentationStyle) { > UIModalPresentationFullScreen = 0, > UIModalPresentationPageSheet NS_ENUM_AVAILABLE_IOS(3_2) > __TVOS_PROHIBITED, > UIModalPresentationFormSheet NS_ENUM_AVAILABLE_IOS(3_2) > __TVOS_PROHIBITED, > UIModalPresentationCurrentContext NS_ENUM_AVAILABLE_IOS(3_2), > UIModalPresentationCustom NS_ENUM_AVAILABLE_IOS(7_0), > > (you can see this in the UIViewController.h file in the UIKit, which is found > underneath your Xcode install) > > The importer notes that the name of such typedef'd constants effectively > become translated into an enum as far as Swift source code is concerned, but > it's a different kind of case. > > Having said that, it might be a bug in the case that the description of the > constant isn't the name of the element type. It would be worth raising this > on bugs.swift.org <http://bugs.swift.org/> and use this example in case > there's something that can be done to fix it. > > Alex > > _______________________________________________ > swift-users mailing list > swift-users@swift.org > https://lists.swift.org/mailman/listinfo/swift-users
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