ios - Swift 2.0 Migration errors -


i've watched wwdc sessions, reading new programmers book on swift, , reading related questions on stack overflow find. fixed errors in app after migrating swift 1.2 swift 2.0.

however there's still few i've not managed solve.

downcasting anyobject

error:

cannot downcast '[anyobject]' more optional type '[nsmanagedobject]'

code:

    let fetchrequest = nsfetchrequest(entityname: formulaentity)      var error: nserror?      {         let fetchedresults = try managedcontext.executefetchrequest(fetchrequest) as! [nsmanagedobject]?          if let results = fetchedresults {             stocks = results         } else {             print("could not fetch \(error), \(error!.userinfo)")         }     } catch {         print("error: \(error)")     }

the error shown happening in let fetchedresults = try... line

another strange error i'm having in appdelegate:

error:

'nsmutabledictionary' not convertible '[nsobject : anyobject]'

code:

    lazy var persistentstorecoordinator: nspersistentstorecoordinator? = {     // persistent store coordinator application. implementation creates , return coordinator, having added store application it. property optional since there legitimate error conditions cause creation of store fail.     // create coordinator , store     var coordinator: nspersistentstorecoordinator? = nspersistentstorecoordinator(managedobjectmodel: self.managedobjectmodel)     let url = self.applicationdocumentsdirectory.urlbyappendingpathcomponent("stocks.sqlite")     var error: nserror? = nil     var failurereason = "there error creating or loading application's saved data."     {         try coordinator!.addpersistentstorewithtype(nssqlitestoretype, configuration: nil, url: url, options: nil)     } catch var error1 nserror {         error = error1         coordinator = nil         // report error got.         let dict = nsmutabledictionary()         dict[nslocalizeddescriptionkey] = "failed initialize application's saved data"         dict[nslocalizedfailurereasonerrorkey] = failurereason         dict[nsunderlyingerrorkey] = error         error = nserror(domain: "your_error_domain", code: 9999, userinfo: dict [nsobject : anyobject])         // replace code handle error appropriately.         // abort() causes application generate crash log , terminate. should not use function in shipping application, although may useful during development.         nslog("unresolved error \(error), \(error!.userinfo)")         abort()     } catch {         fatalerror()     }      return coordinator }()

i have not ever touched code above. have no idea why wasn't migrated properly, apple's migration tool.

another error in appdelegate:

binary operator '&&' cannot applied 2 bool operands

call can throw, not marked 'try' , error not handled.

code:

func savecontext () {     if let moc = self.managedobjectcontext {         var error: nserror? = nil         if moc.haschanges && !moc.save() {             // replace implementation code handle error appropriately.             // abort() causes application generate crash log , terminate. should not use function in shipping application, although may useful during development.             nslog("unresolved error \(error), \(error!.userinfo)")             abort()         }     } }

again havn't touched part of appdelegate, , not sure wrong code above.

cannot downcast '[anyobject]' more optional type '[nsmanagedobject]'

in swift 1.2, executefetchrequest(:_) returned [anyobject]?. in swift 2, returns [anyobject] because new try… syntax returns non-optional.

(in case method return nil, method not return @ all, , control move catch block.)

'nsmutabledictionary' not convertible '[nsobject : anyobject]'

this means you're trying insert nsmutabledictionary can't converted objective-c object. in case, think it's because error struct conforming errortype, rather nserror object. try adding error1 instead.

call can throw, not marked 'try' , error not handled.

save() might throw error needs executed try, instead of being evaluated bool. martin r. points out in comments, answer this question provides complete solution won't rehash here.


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