ios - Singleton archiving not unarchiving usable instance -


i've run trouble trying archive singleton project. technically applies 2 singletons archive under single wrapper array purposes of question, i'll involve "notebook" singleton.

my problem recalling archive doesn't reproduce instance correctly, appears "null" app otherwise performs.

my idea archive singleton once app enters background, here's method in appdelegate:

- (void)applicationdidenterbackground:(uiapplication *)application { // use method release shared resources, save user data, invalidate timers, , store enough application state information restore application current state in case terminated later. // if application supports background execution, method called instead of applicationwillterminate: when user quits.  settings *sharedsettings = [settings sharedsettings]; notebook *sharednotebook = [notebook sharednotebook]; nsarray *array_wrapperforsave = @[sharedsettings, sharednotebook];  nsarray *archivedirectory = nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes); nsstring *archivepathforarray = [archivedirectory objectatindex:0]; nsstring *directoryforarray = [archivepathforarray stringbyappendingstring:@"userdatabundle.archive"]; archivepath = directoryforarray;  bool success = [nskeyedarchiver archiverootobject:array_wrapperforsave tofile:archivepath];  nslog(@"data archive status: %d", success);

that nslog returns 1 (success)

here notebook.m's initializer(s), important offending line last method call:

#pragma mark - initializers  - (instancetype)init {     self = [super init];     if (self) {         array_highlights = [[nsmutablearray alloc] init];         array_sections = [[nsmutablearray alloc] init];         sharedsettings = [settings sharedsettings];         indexoflastloadedsection = 0;          section *rootsection = [[section alloc] initwithtitle:@"main tab"];         [self savesection:rootsection];  //        self = [self accessarchivedinstance];     // causes huge issues.     }     return self; }  - (instancetype)initwithcoder:(nscoder *)adecoder {     self = [super init];     if (self) {         array_sections = [adecoder decodeobjectforkey:@"array_sections"];         array_highlights = [adecoder decodeobjectforkey:@"array_highlights"];         indexoflastloadedsection = [adecoder decodeintegerforkey:@"indexoflastloadedsection"];     }     return self; }

here method grabs file path wrapper array , uncases proper object instance @ index:

- (notebook *)accessarchivedinstance {     nsarray *archivedirectory = nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes);     nsstring *archivepathforarray = [archivedirectory objectatindex:0];     nsstring *directoryforarray = [archivepathforarray stringbyappendingstring:@"userdatabundle.archive"];       nsarray *array_archivedsingletons = [nskeyedunarchiver unarchiveobjectwithfile:directoryforarray];     notebook *returninstance = [array_archivedsingletons objectatindex:1];      nslog(@"notebook instance awaking archive");      return returninstance; }

singleton method:

+ (id)sharednotebook {     static notebook *sharednotebook = nil;     static dispatch_once_t oncetoken;     dispatch_once(&oncetoken, ^{         sharednotebook = [[self alloc] init];     });      return sharednotebook; }

i can of course provide info if needed. in advance!

the main issue never use accessarchiveinstance , when tried in wrong place.

modify sharednotebook be:

+ (id)sharednotebook {     static notebook *sharednotebook = nil;     static dispatch_once_t oncetoken;     dispatch_once(&oncetoken, ^{         nsarray *archivedirectory = nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes);         nsstring *archivepathforarray = [archivedirectory objectatindex:0];         nsstring *directoryforarray = [archivepathforarray stringbyappendingpathcomponent:@"userdatabundle.archive"];         if ([[nsfilemanager defaultmanager] fileexistsatpath:directoryforarray]) {             nsarray *array_archivedsingletons = [nskeyedunarchiver unarchiveobjectwithfile:directoryforarray];             sharednotebook = [array_archivedsingletons objectatindex:1];         } else {             sharednotebook = [[self alloc] init];         }     });      return sharednotebook; }

and remove accessarchiveinstance method.


Comments

Post a Comment

Popular posts from this blog

java - Spring Data JPA: Why findOne(id) executing delete query internally? -

i have 1 application using @manytomany annotation link 2 different entities 1 parent entity. not sure if have implemented properly. when execute .findone() on parent entity's repository find it, @ first fetch data along executing delete queries internally delete record mapping table (a table jpa creates after adding @manytomany annotation.). following generated sql queries , code snippet: java class @entity @table(name = "inventory") public class inventory { @id long id; // many other properties @manytomany(fetch=fetchtype.lazy) private list<stream> streams; @manytomany(fetch=fetchtype.lazy) private list<subject> subjects; } there no other annotation i've put in stream , subject entity class link inventory class. when run app, create following tables: inventory stream subject inventory_stream inventory_subject (inventory_stream , inventory_subject, 2 tables created automatically, don't k...
Read more

python - Mongodb How to add addtional information when aggregating? -

i beginner , wrote line pipeline works, wanna add other information output, screen name , or number of tweets.i tried add under $group gave me syntax error everytime here pipeline: def make_pipeline(): # complete aggregation pipeline pipeline = [ { '$match': { "user.statuses_count": {"$gt":99 }, "user.time_zone": "brasilia" } }, { "$group": { "_id": "$user.id", "followers": { "$max": "$user.followers_count" } } }, { "$sort": { "followers": -1 } }, { "$limit" : 1 } ]; i using on example : { "_id" : objectid("5304e2e3cc9e684aa98bef97"), "text" : "first week of school on :p", "in_reply_to_status_id" : null, "retweet_count" : null, ...
Read more

java - Incorrect order of records in M-M relationship in hibernate -

Image
i have 4 records in bridge table in mysql database. using @manytomany in hibernate, accurate order of employees incorrect incorrect of projects. following required material figure out doing mistake. this source. @entity @table(name="project") public class projectbean { @id @generatedvalue @column(name="project_id") private int projectid; @column(name="title") private string projecttitle; @manytomany(mappedby="projects") private collection<employeebean> employees; public projectbean() { employees = new arraylist<employeebean>(); } //getters & setters } @entity @table(name="employee") public class employeebean { @id @generatedvalue @column(name="employee_id") private int employee_id; @column(name="first_name") private string ...
Read more