ios - UIManagedDocument file being automatically deleted with saveToURL:forSaveOperation:completionHandler: -

i'm using core data uimanageddocument inventory-keeping app. problem i'm having "savetourl:..." method deleting uimanageddocument file in documents directory when save using uidocumentsaveforoverwriting after adding item core data. happens @ first launch new build. created core data/uimanageddocument helper singleton use throughout app.

here's how initialize uimanageddocument instance:

@interface vdfcoredatahelper : nsobject  @property (strong, nonatomic) nsmanagedobjectcontext *managedobjectcontext; @property (strong, nonatomic) uimanageddocument *manageddocument;  @implementation vdfcoredatahelper  - (void)createmanageddocument {     nsurl *docsurl = [self getdocsurl];     if (![[nsfilemanager defaultmanager] fileexistsatpath:[docsurl path]]) {         nslog(@"new doc made");         _manageddocument = [[uimanageddocument alloc] initwithfileurl:docsurl];         [self savemanageddocumentforcreation];         [self openmanageddocument];     } else {         nslog(@"existing doc");         _manageddocument = [[uimanageddocument alloc] initwithfileurl:docsurl];         [self openmanageddocument];     } } 

createmanageddocument called in init method. have 2 save methods. 1 creating , 1 overwriting. first 1 called when created managed document.

at point, i've saved once , uimanageddocument directory , persistent store files exist in documents folder.

when want insert item object (an item entity exists), call method:

- (void)insertmanagedobject:(nsmanagedobject *)object success:(void (^)(bool successful))successblock {     nsmanagedobjectcontext *context = [self context];     [context insertobject:object];     nserror *error;     [context save:&error];     if (self.manageddocument.documentstate == uidocumentstatenormal) {         [self.manageddocument savetourl:[self getdocsurl] forsaveoperation:uidocumentsaveforoverwriting completionhandler:^(bool success){             successblock(success);         }];     } } 

after "savetourl:forsaveoperation:" on writing called, managed document directory , files in documents folder automatically deleted. managedobjectcontext, item object, , manageddocument object valid @ point. document's url points correct destination, files gone.

after "insertmanagedobject" method finished, use navigation controller pop rootviewcontroller contains table view listing items. data added kept in memory , fetchedresultscontroller loads it, data not saved disk because there isn't persistent store longer. when exit app , re-enter, nothing shows , new managed document created again.

this happens if clear build , launch first time. if launched , exit, , enter app again, works fine. it's "savetourl:...: method deleting persistent store.

i've tried subclassing uimanageddocument , logging errors, doesn't show error whatsoever. i've tried commenting out of code, don't make difference.

if don't use "savetourl", persistent store doesn't deleted, upon re-launch, fetchresultscontroller.fetchobjects returns empty array , tries access non-existent indexpath, crashing app.

i'm considering ditching uimanageddocument right now. hopefully, can tell me may doing wrong, or has had same problem.

thanks.

i struggling same problem you. wasn't finding help...

the deleting part no error whatsoever driving me nuts, , ditched uimanageddocument.

but did works!.

actually think problem trying access document after creating it, calling selector:

[_document savetourl:self.documenturl forsaveoperation:uidocumentsaveforcreating completionhandler:^(bool success) {}]; 

then did after saving document close it, new instance , reopen it. this:

[_coredocument savetourl:self.documenturl forsaveoperation:uidocumentsaveforcreating completionhandler:^(bool success) {                 if (success) {                     nslog(@"document created");                      [_coredocument closewithcompletionhandler:^(bool success) {                         if (success) {                             nslog(@"closed created document, open again");                             _coredocument = nil;                             _coredocument = [[checkinmanageddocument alloc] initwithfileurl:self.documenturl];                             [_coredocument openwithcompletionhandler:^(bool success) {                                 nslog(@"document oppened afer creating , closing it");                                 [self documentisreadyforuse];                             }];                                                     }                     }];                                     } else {                     nslog(@"could not save document @ path: %@", self.documenturl.path);                 }              }];