Version COREDATAMANAGER-OC-compatible with previous versions of IOS10

Tag: transaction instantiation void STR code NTS file res add

Header file:

1 #import<Foundation/Foundation.h>2 #import<CoreData/CoreData.h>3 4 /**5 CoreData Manager6  */7 @interfaceCoredatamanager:nsobject8 9+(instancetype) Sharedmanager;Ten  One /** A Persistence Container-can provide management context for IOS 10 launch - contains all core objects in the core Data stack, which are not thread-safe -   the -Nsmanagedobjectcontext *viewcontext; management context - -Nsmanagedobjectmodel *managedobjectmodel; - -Nspersistentstorecoordinator *persistentstorecoordinator; -  */ + //@property (readonly, strong) Nspersistentcontainer *persistentcontainer; -  + /** A Managing Object Contexts at  */ -@property (ReadOnly, strong) Nsmanagedobjectcontext *MoC; -  - /** - Save Context -  */ in- (void) Savecontext; -  to @end

. m File:

1 #import "CoreDataManager.h"2 3 @implementationCoredatamanager4 5+(instancetype) Sharedmanager {6     Static IDinstance;7     Staticdispatch_once_t Oncetoken;8Dispatch_once (&oncetoken, ^{9instance = [SelfNew];Ten     }); One     returninstance; A } -  - #pragmaMark-core Data Stack the //If you override the Getter method for a read-only property, the compiler no longer provides the _ member variable - @synthesizeMOC =_moc; -  - /** + for low-version compatibility -  */ +-(Nsmanagedobjectcontext *) MoC { A      at     if(_moc! =Nil) { -         return_moc; -     } -      -     //Mutex, you should lock the code as little as possible!  - @synchronized (self) { in          -         //1. Instantiating the management context to_moc =[[Nsmanagedobjectcontext alloc] initwithconcurrencytype:nsmainqueueconcurrencytype]; +          -         //2. Manage object Models (entities) theNsmanagedobjectmodel *mom =[Nsmanagedobjectmodel Mergedmodelfrombundles:nil]; *          $         //3. Persistent Storage SchedulerPanax NotoginsengNspersistentstorecoordinator *PSC =[[Nspersistentstorecoordinator alloc] initwithmanagedobjectmodel:mom]; -          the         //4. Adding a database +         /** A 1> data storage type the 3> Save the URL of the SQLite database file + 4> Setting Database Options -          */ $NSString *cachedir =nssearchpathfordirectoriesindomains (Nscachesdirectory, Nsuserdomainmask, YES). Lastobject; $NSString *path = [Cachedir stringbyappendingpathcomponent:@"ys.db"]; -         //convert the full path of a local file to a file URL -Nsurl *url =[Nsurl Fileurlwithpath:path]; the          -Nsdictionary *options =@{nsmigratepersistentstoresautomaticallyoption: @ (YES),Wuyi nsinfermappingmodelautomaticallyoption: @ (YES)}; the          - [PSC addpersistentstorewithtype:nssqlitestoretype configuration:nil Url:url options:options ERROR:NULL]; Wu          -         //5. Specifying the storage scheduler for the management context About_moc.persistentstorecoordinator =PSC; $     } -      -     return_moc; - } A  + #pragmaMark-core Data Saving Support the- (void) Savecontext { -Nsmanagedobjectcontext *context =Self.moc; $      the     //determine if there are data changes in the context the     //' transaction ' can save multiple data, not necessarily every time the data changes need to be saved, for example: for adding more than one record, you can call the last save operation!  the     if(![Context HasChanges]) { the         return; -     } in      the     //Save Data theNserror *error =Nil; About      the     if(! [Context save:&ERROR]) { theNSLog (@"Error saving Data%@,%@", error, error.userinfo); the     } + } -  the @end

Version COREDATAMANAGER-OC-compatible with previous versions of IOS10