对coreData中得到context的封装

+(NSManagedObjectContext *)getContext{

    NSManagedObjectModel * model=[NSManagedObjectModel mergedModelFromBundles:nil];

    

    NSPersistentStoreCoordinator * psc=[[NSPersistentStoreCoordinator alloc]initWithManagedObjectModel:model];

    

    NSString * path=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];

    

    path=[path stringByAppendingPathComponent:@"tel.sqlite"];

    

    NSLog(@"%@",path);

    

    NSURL * url=[[NSURL alloc]initFileURLWithPath:path];

    

    [psc addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:url options:nil error:nil];

    

    NSManagedObjectContext * con=[[NSManagedObjectContext alloc]init];

    

    con.persistentStoreCoordinator=psc;

    

    return con;

}