FYI, here is the GitHub commit that addressed this issue: https://github.com/apple/swift/commit/1f11ef2fd29f214bd9d9a5fa85246d36c04448f0 <https://github.com/apple/swift/commit/1f11ef2fd29f214bd9d9a5fa85246d36c04448f0>
It was also reported as SE-0140. Basically, optional values were getting bridged to an opaque-to-Foundation “_SwiftValue” class, which means NSJSONSerialization couldn’t figure out what to do with it. - Tony > On Nov 18, 2016, at 11:46 AM, Dan Loewenherz via swift-users > <swift-users@swift.org> wrote: > > I've encountered a similar bug and filed a radar a few months ago. My report > was marked as a duplicate but besides that I haven't received any follow-up. > It does appear to have been fixed in Xcode 8.1 / Swift 3.0.1. > http://www.openradar.me/28365419 <http://www.openradar.me/28365419> > > Essentially, NSJSONSerialization would (does?) crash if you ask it to encode > an array/dictionary of Anys containing an optional value containing a bridged > Foundation type. The below snippet was the easiest demonstration of the > runtime exception. > > let name: String? = "Spike" > let dogNames: [Any] = [name] > > do { > try JSONSerialization.data(withJSONObject: dogNames, options: > .prettyPrinted) > } catch { > print("HI") > } > > What version of Swift is the user of your framework using? > > Dan > > On Fri, Nov 18, 2016 at 1:37 PM, Jens Alfke via swift-users > <swift-users@swift.org <mailto:swift-users@swift.org>> wrote: > A developer using the framework I work on just reported > <https://forums.couchbase.com/t/exception-caught-in-map-block-of-view-invalid-type-in-json-write--swiftvalue/10808> > an exception which is triggered by NSJSONSerialization (see backtrace > below.) Basically an NSDictionary gets parsed from JSON data (in Obj-C), > passed to a Swift function, which then calls another function (written in > Obj-C) that serializes it back to JSON data. That last step is crashing due > to some problem with bridging. > > The events leading up to this are: > > 1. The framework (written in Obj-C) parses some JSON data using > NSJSONSerialization, resulting in an NSDictionary. > 2. The NSDictionary is passed as a parameter to a block; the parameter is > typed as `NSDictionary*`. > 3. The block is part of the application, which is written in Swift. > 4. The block in turn passes that NSDictionary to a function in the framework > (through a parameter is typed as `id`) > 5. The framework uses NSJSONSerialization to convert that id to data. > > Step 5 is triggering an assertion failure in Foundation. Apparently it failed > to un-bridge a Swift value in an array back into an NSObject. (From the > contents of the dictionary I know that the single-object array in question > contains a string.) > > Any idea what’s going on here? I’ve never seen this happen before, and this > part of our framework has been around for 2 ½ years. People have successfully > built Swift apps using the framework. (This app was built with Xcode 8.0; > don’t know what the OS is, though.) > > Invalid type in JSON write (_SwiftValue) > 3 Foundation 0x0000000111263284 > _writeJSONValue + 668 > 4 Foundation 0x00000001112636d9 > ___writeJSONArray_block_invoke + 132 > 5 CoreFoundation 0x0000000118e1ce2a > -[__NSSingleObjectArrayI enumerateObjectsWithOptions:usingBlock:] + 58 > 6 Foundation 0x00000001112633df > _writeJSONArray + 330 > 7 Foundation 0x0000000111263204 > _writeJSONValue + 540 > 8 Foundation 0x0000000111262f94 > -[_NSJSONWriter dataWithRootObject:options:error:] + 124 > 9 Foundation 0x0000000111262e74 > +[NSJSONSerialization dataWithJSONObject:options:error:] + 333 > ... > > —Jens > > _______________________________________________ > swift-users mailing list > swift-users@swift.org <mailto:swift-users@swift.org> > https://lists.swift.org/mailman/listinfo/swift-users > <https://lists.swift.org/mailman/listinfo/swift-users> > > > _______________________________________________ > swift-users mailing list > swift-users@swift.org > https://lists.swift.org/mailman/listinfo/swift-users
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