Version Coredatamanager-swift-compatible with previous versions of IOS10

1 Import UIKit2 Import CoreData3 4 //CoreData Manager5 classCoredatamanager:nsobject {6     7     //Single Case8     StaticLet Sharedmanager:coredatamanager =Coredatamanager ()9     Ten     //Privatization Constructors One     Override Privateinit () { A Super.init () -     } -      the     //persistence container, can provide management context -     //IOS10 introduced, in order to be compatible with the low version, we set up here private, no longer use, manually implement the management object context, see the next property -     //contains all the core objects in Coredatastack, the following are three important objects -     //Viewcontext:nsmanagedobjectcontext-management context, primarily responsible for data manipulation +     //Managedobjectmodel:nsmanagedobjectmodel-Manage Object Model -     //Persistentstorecoordinator:nspersistentstorecoordinator +     PrivateLazy var persistentcontainer:nspersistentcontainer? = { A          at         //the core objects of CoreData are not thread-safe. -         //ensure thread safety with synchronous/mutex locks - Objc_sync_enter (self) -         //instantiating an object, you need to specify the data model -         //specified name = = Name of the data model = = name of the database in the sandbox -         //Let container = Nspersistentcontainer (name: "demo_db") in          -         //Manage object model, parameters pass in nil, automatically merge all data models in Mainbundle toLet model = Nsmanagedobjectmodel.mergedmodel (FROM:NIL)! +          -         //instantiating a persisted container the         //parameter one: database name *         //parameter two: the merged model $var container:nspersistentcontainer? = Nspersistentcontainer (Name:"ys.db", Managedobjectmodel:model)Panax Notoginseng          -          the         //"synchronous mode" load "persistent storage"--the essence is to open/new/Modify the database (synchronous mode, ensure thread safety) +Container?. Loadpersistentstores (Completionhandler: {(storedescription, error)inch A             //To determine if the database was created with errors the             ifLet error = Error asNserror? { +                 /* - Common errors: $ 1, directory does not exist, or write forbidden, unable to create database file $ 2. Insufficient storage space for equipment - 3. Persistent storage cannot be accessed due to data protection when the permission or device is locked - 4. The database cannot be migrated to the current model version the                  */ -Print"Open/New/Modify Database error: \ (Error)")Wuyicontainer =Nil the             } -         }) Wu          - objc_sync_exit (self) About          $         returnContainer -     }() -      -     //Managing Object Contexts ALazy var moc:nsmanagedobjectcontext? = { +         //Synchronous lock/Mutex protection the objc_sync_exit (self) -          $         //instantiating the management context thevar mocobj:nsmanagedobjectcontext? =Nsmanagedobjectcontext (concurrencytype:. Mainqueueconcurrencytype) the          the         //instantiating an object model theLet Momobj = Nsmanagedobjectmodel.mergedmodel (from:nil)! -          in         //Persistent Storage Scheduler theLet PSC =nspersistentstorecoordinator (managedobjectmodel:momobj) the          About         //Add a database the         //parameter 1: Data storage type the         //Parameter 3: Save the URL of the SQLite database file the         //parameter 4: Set database Options +Let Cachedir = Nssearchpathfordirectoriesindomains (. Cachesdirectory,. Userdomainmask,true). last! -Let Path = (cachedir asNSString). Appendingpathcomponent ("ys.db") theLet dict = [nsmigratepersistentstoresautomaticallyoption:true,BayiNsinfermappingmodelautomaticallyoption:true] the          theLet PersistentStore =Try?Psc.addpersistentstore (Oftype:nssqlitestoretype, Configurationname:nil, At:url (fileurlwithpath:path), options : dict) -          -         ifPersistentStore! =nil{ the             //specifying the storage scheduler for the management context theMocobj?. Persistentstorecoordinator =PSC the         } the         Else{ -Print"Error opening/new/modifying Database") theMocobj =Nil the         } the         94 objc_sync_exit (self) the          the         returnMocobj the     }()98      About     //Save Context - func Savecontext () {101         ifLet context =moc{102             //transactions: You can save multiple data, not necessarily every time the data changes need to save, can be saved at once103             ifContext.haschanges {104                  Do { the                     TryContext.save ()106}Catch {107Let Nserror = Error asNserror108Print"Error saving data: \ (nserror)")109                 } the             }111         } the     }113}

Version Coredatamanager-swift-compatible with previous versions of IOS10