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MediaComputingGroupRWTHAachenUniversityJan-PeterKrmeriPhoneApplicationProgrammingLecture09:DataPersistencehttp://hci.
rwth-aachen.
de/iphoneWinterSemester2013/2014iPhoneApplicationProgrammingProf.
JanBorchersWhatdatadowehaveondevices2HowdowepresentdatatotheuseriPhoneApplicationProgrammingProf.
JanBorchers3iPhoneApplicationProgrammingProf.
JanBorchers4iPhoneApplicationProgrammingProf.
JanBorchers5iPhoneApplicationProgrammingProf.
JanBorchers6"Documents""Settings""Shoebox"iPhoneApplicationProgrammingProf.
JanBorchersDataHandlingOverview7DocumentAppData"Settings""Shoebox"LocalNSUserDefaultsUIDocumentDatabaseSyncediCloudKey/ValueGameCenterUIDocumentwithiCloudDatabaseOnlineCommunicationwithawebserverCoreDataiPhoneApplicationProgrammingProf.
JanBorchersPreferencesandSettings8NSUserDefaultsSingletonKey/valuepairsProvidesstandardvalues(factorydefaults)SettingsBundleDescribespreferencesmanagedinsettingsSamekeysasinNSUserDefaultsiPhoneApplicationProgrammingProf.
JanBorchersPreferencesandSettings8NSUserDefaultsSingletonKey/valuepairsProvidesstandardvalues(factorydefaults)SettingsBundleDescribespreferencesmanagedinsettingsSamekeysasinNSUserDefaultsiPhoneApplicationProgrammingProf.
JanBorchersPreferencesandSettings9NSUserDefaultsApplicationiPhoneApplicationProgrammingProf.
JanBorchersDemo10iPhoneApplicationProgrammingProf.
JanBorchersDataHandlingOverview11DocumentAppData"Settings""Shoebox"LocalNSUserDefaultsUIDocumentDatabaseSyncediCloudKey/ValueGameCenterUIDocumentwithiCloudDatabaseOnlineCommunicationwithawebserveriPhoneApplicationProgrammingProf.
JanBorchersWheretoputles-(NSURL*)localDocumentsDirectoryURL{staticNSURL*localDocumentsDirectoryURL=nil;if(localDocumentsDirectoryURL==nil){//usesystemfunctionNSString*documentsDirectoryPath=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES)objectAtIndex:0];localDocumentsDirectoryURL=[NSURLfileURLWithPath:documentsDirectoryPath];}returnlocalDocumentsDirectoryURL;}12iPhoneApplicationProgrammingProf.
JanBorchersUIDocument13HighlevelAPIforleaccessAlwaysrepresentsauserdocumentCanhandlelepackagesAutosavingUndoHandlesremotechangesfromiCloudUIManagedDocumentforCoreDataiPhoneApplicationProgrammingProf.
JanBorchersCreatinganewdocument//creatinganewdocumentself.
document=[[UIDocumentalloc]initWithFileURL:fileURL];//documentcreatedinmemory[self.
documentsaveToURL:self.
document.
fileURLforSaveOperation:UIDocumentSaveForCreatingcompletionHandler:^(BOOLsuccess){//filecreatedondiskif(success)[selfdisplayFileContents];}];14//UIDocument-(id)initWithFileURL:(NSURL*)url{self=[superinitWithFileURL:url];if(self)self.
textcontents=@"Helloworld!
";returnself;}iPhoneApplicationProgrammingProf.
JanBorchersSavingaUIDocument//ReturnNSDatarepresentationforsaving-(id)contentsForType:(NSString*)typeNameerror:(NSError**)outError{NSData*data=[self.
contentsdataUsingEncoding:NSUTF8StringEncoding];returndata;}15getssavedwhenleisclosedorautosavedwhenchangesarependingNSUndoManagerorcallupdateChangeCount:iPhoneApplicationProgrammingProf.
JanBorchersDataHandlingOverview16DocumentAppData"Settings""Shoebox"LocalNSUserDefaultsUIDocumentDatabaseSyncediCloudKey/ValueGameCenterUIDocumentwithiCloudDatabaseOnlineCommunicationwithawebserveriPhoneApplicationProgrammingProf.
JanBorchersSQLite17iPhoneApplicationProgrammingProf.
JanBorchersDataHandlingOverview18DocumentAppData"Settings""Shoebox"LocalNSUserDefaultsUIDocumentDatabaseSyncediCloudKey/ValueGameCenterUIDocumentwithiCloudDatabaseOnlineCommunicationwithawebserverCoreDataiPhoneApplicationProgrammingProf.
JanBorchersCoreData19iPhoneApplicationProgrammingProf.
JanBorchersCoreData20HighlevelrelationaldatastorageAutomaticpersistenceHighperformanceaccessGetundo/redoforfreeAvailabledatastoresMemoryBinaryleSQLiteiPhoneApplicationProgrammingProf.
JanBorchersCoreDataStack21CoreDataStackhoneApplicationProgrammingProf.
JanBorchersYourControllerUIApplicationDelegateNSManagedObjectContextNSManagedObjectNSPersistentStoreCoordinatorNSPersistentStoreNSManagedObjectModelNSEntityDescriptionYourModelObjectiPhoneApplicationProgrammingProf.
JanBorchersCustomModelClass//Recipe.
h@interfaceRecipe:NSManagedObject{}@property(retain)NSString*title;//Recipe.
m#import"Recipe.
h"@implementationRecipe@dynamictitle;@end24iPhoneApplicationProgrammingProf.
JanBorchersCreating/DeletingManagedCreate(Insert)NSManagedObjectContextEntityname[NSEntityDescriptioninsertNewObjectForEntityForName:[entityname]inManagedObjectContext:context]DeleteNSManagedObjectContextNSManagedObject[contextdeleteObject:managedObject];Savecontexttomakechangepersistent25iPhoneApplicationProgrammingProf.
JanBorchersRetrievingManagedObjectsNSFetchRequestEntity:NSEntityDescriptionSortingcriteria:NSSortDescriptorsSearchcriteria:NSPredicateNSFetchedResultsControllerTailoredtoprovidedataforUITableViewsRequires:NSFetchRequest,NSManagedObjectContextChangetrackingviadelegate26iPhoneApplicationProgrammingProf.
JanBorchersFetchData//SetupthefetchrequestNSFetchRequest*request=[[NSFetchRequestfetchRequestWithEntityName:@"Recipe"];//ConfigurethefetchrequestNSSortDescriptor*sortDescriptor=[NSSortDescriptorsortDescriptorWithKey:@"creationDate"ascending:NO];[requestsetSortDescriptors:@[sortDescriptor]];//ExecutetherequestNSError*error=nil;NSArray*fetchResults;fetchResults=[managedObjectContextexecuteFetchRequest:requesterror:&error];if(error){//Handletheerror.
}27iPhoneApplicationProgrammingProf.
JanBorchersUndoManager//attachundomanagerundoManager=[[NSUndoManageralloc]init];[self.
managedObjectContextsetUndoManager:undoManager];//performundo[self.
managedObjectContextundo];28iPhoneApplicationProgrammingProf.
JanBorchersDemo29iPhoneApplicationProgrammingProf.
JanBorchersPerformance30[requestsetPropertiesToFetch:@[@"name"]];[requestsetPropertiesToGroupBy:@[@"major"]];UsebatchfetchesJustfetchneededvaluesUsepredicatestolterresultsUseSQLiteforcalculationsUseSQLDebuggingiPhoneApplicationProgrammingProf.
JanBorchersPerformance30request.
predicate=[NSPredicatepredicateWithFormat:@"age>%@ANDname==%i",name,age];UsebatchfetchesJustfetchneededvaluesUsepredicatestolterresultsUseSQLiteforcalculationsUseSQLDebuggingTextcomparisonisexpensiveNumericcomparisonischeapiPhoneApplicationProgrammingProf.
JanBorchersPerformance30NSExpressionDescription*ed=[[NSExpressionDescriptionalloc]init];ed.
name=@"minimum";ed.
expression=[NSExpressionexpressionForFunction:@"min:"arguments:@[[NSExpressionexpressionForKeyPath:@"grade"]]];[requestsetPropertiesToFetch:@[ed]];UsebatchfetchesJustfetchneededvaluesUsepredicatestolterresultsUseSQLiteforcalculationsUseSQLDebuggingiPhoneApplicationProgrammingProf.
JanBorchersPerformance30UsebatchfetchesJustfetchneededvaluesUsepredicatestolterresultsUseSQLiteforcalculationsUseSQLDebugging-com.
apple.
CoreData.
SQLDebug1iPhoneApplicationProgrammingProf.
JanBorchersConcurrency31MainQueueContextMainQueueContextPrivateQueueContextPrivateQueueContextPersistentStoreCoordinatoriPhoneApplicationProgrammingProf.
JanBorchersConcurrency31MainQueueContextMainQueueContextPrivateQueueContextPrivateQueueContextPersistentStoreCoordinatoriPhoneApplicationProgrammingProf.
JanBorchersConcurrency31MainQueueContextMainQueueContextPrivateQueueContextPrivateQueueContextPersistentStoreCoordinatorSaveiPhoneApplicationProgrammingProf.
JanBorchersConcurrency31MainQueueContextMainQueueContextPrivateQueueContextPrivateQueueContextPersistentStoreCoordinatorSaveiPhoneApplicationProgrammingProf.
JanBorchersConcurrency31MainQueueContextMainQueueContextPrivateQueueContextPrivateQueueContextPersistentStoreCoordinatoriPhoneApplicationProgrammingProf.
JanBorchersSaveConcurrency31MainQueueContextMainQueueContextPrivateQueueContextPrivateQueueContextPersistentStoreCoordinatorriPhoneApplicationProgrammingProf.
JanBorchersConcurrency32MainQueueContextMainQueueContextPrivateQueueContextPrivateQueueContextPersistentStoreCoordinatoriPhoneApplicationProgrammingProf.
JanBorchersConcurrency32MainQueueContextMainQueueContextPrivateQueueContextPrivateQueueContextPersistentStoreCoordinatorFetchriPhoneApplicationProgrammingProf.
JanBorchersDataHandlingOverview33DocumentAppData"Settings""Shoebox"LocalNSUserDefaultsUIDocumentDatabaseSyncediCloudKey/ValueGameCenterUIDocumentwithiCloudDatabaseOnlineCommunicationwithawebserveriPhoneApplicationProgrammingProf.
JanBorchersiCloud34iPhoneApplicationProgrammingProf.
JanBorchersiCloudBasicsChangesononedeviceareautomaticallypushedtootherdevicesUsercanpickupanydeviceandwillalwayshaveaccesstoherdataSyncisperappandperuserFreesubscriptionis5GBsharedamongallapps35iPhoneApplicationProgrammingProf.
JanBorchersiCloudAPIsSettings:useNSUbiquitousKeyValueStore(similarlytoNSUserDefaults)1MBlimitationSyncswithinminutesLastvaluealwayswinsDocuments:UIDocumentonaURLinaspecialfolderNolimitSyncswithinsecondsCanmergeconictingles36NSUbiquitousKeyValueStorApplicationUIDocumentiPhoneApplicationProgrammingProf.
JanBorchersDataHandlingOverview37DocumentAppData"Settings""Shoebox"LocalNSUserDefaultsUIDocumentDatabaseSyncediCloudKey/ValueGameCenterUIDocumentwithiCloudDatabaseOnlineCommunicationwithawebserveriPhoneApplicationProgrammingProf.
JanBorchersDatabaseDatabaseDatabaseDatabaseDatabaseDatabaseDatabaseRemote(Web)Objects38iPhoneApplicationProgrammingProf.
JanBorchersWebBackendServerXMLHTTPJSONRemote(Web)Objects39iPhoneApplicationProgrammingProf.
JanBorchersRepresentationalStateTransfer(REST)ResourcemanipulationviaHTTPoperationsURLdescribesresourceDataencodedinXMLorJSONGET,PUT,POST,DELETEoperationsareusedtomanipulateresources40http://my.
server.
com/person/127.
xmlServerAddressResourceNameResourceIdFormatiPhoneApplicationProgrammingProf.
JanBorchersiPhoneHTTPRequests//createrequestNSURL*url=[NSURLURLWithString:@"http://server/people.
xml"];request=[[NSMutableURLRequestalloc]initWithURL:url];//settheHTTPoperation[requestsetHTTPMethod:@"POST"];//setthepostdataNSData*postData=[@"id=1&person[name]=Paul"dataUsingEncoding:NSUTF8StringEncoding];[requestsetHTTPBody:postData];//firetherequestconnection=[NSURLConnectionconnectionWithRequest:requestdelegate:self];[connectionstart];41iPhoneApplicationProgrammingProf.
JanBorchersBasicDataNSDataNSXMLParserNSJSONSerializationNSURLConnectionWebBackendServerRemote(Web)Objects42iPhoneApplicationProgrammingProf.
JanBorchersRestKitBasics43RestKitknowsRESTfulWebservicesCaninteractwithCoreDataKeyparadigm:MappingresponsefromthewebtoObjective-CobjectsiPhoneApplicationProgrammingProf.
JanBorchersRestKitStructure44ObjectManagerManagedObjectStoreResponseEntity/ObjectMappingRequestDescriptoriPhoneApplicationProgrammingProf.
JanBorchersDemo45iPhoneApplicationProgrammingProf.
JanBorchersDataHandlingOverview46DocumentAppData"Settings""Shoebox"LocalNSUserDefaultsUIDocumentDatabaseSyncediCloudKey/ValueGameCenterUIDocumentwithiCloudDatabaseOnlineCommunicationwithawebserverCoreDataiPhoneApplicationProgrammingProf.
JanBorchersMoreInformationSQLiteOnlineDocumentationAppleGuidesArchivesandSerializationProgrammingGuideCoreDataProgrammingGuideDocument-BasedApplicationProgrammingGuideURLLoadingSystemProgrammingGuiderestkit.
orggithub.
com/lichtschlag/iCloudPlaygroundgithub.
com/lichtschlag/Chronos47iPhoneApplicationProgrammingProf.
JanBorchersEpilogue:Sharingdatalocally48Howtogetdatafromapptoapp"Openwith.
.
.
"UIDocumentInteractionControllerAppspublishwhatlestheycanopenSenderapppushesdocument,userselectstargetappDataiscopiedbetweenappsandboxesNowaytotracklesiPhoneApplicationProgrammingProf.
JanBorchersUIDocumentInteractionController-(IBAction)openExternally:(id)sender{//savefirst[self.
documentsaveToURL:self.
document.
fileURLforSaveOperation:UIDocumentSaveForOverwritingcompletionHandler:^(BOOLsuccess){//bringupdialogfromdocinteractioncontrollerself.
docController=[UIDocumentInteractionControllerinteractionControllerWithURL:self.
document.
fileURL];BOOLdidOpen=[docControllerpresentOpenInMenuFromRect:CGRectZeroinView:self.
openButtonanimated:YES];if(!
didOpen){[[[UIAlertViewalloc]initWithTitle:@"Cannotopenfileinotherapps"message:@"Unfortunately,thereisnoappinstalledthatcanhandlethiskindoffile.
"delegate:nilcancelButtonTitle:@"Ok"otherButtonTitles:nil]show];}}];}49iPhoneApplicationProgrammingProf.
JanBorchersChecktheiCloudPlaygrounddemocodeformoreinfoUIDocumentControllerinAction50