iphone - How Can I Get String Dates from Coredata in Asending or Descending Order in IOS -


in applicaiton inserting dates in coredata strings.how can dates in asending or descending order.i using below code fetching date strings coredata , displaying results in section table , fetched dates section titles .

- (void)viewdidload {     [super viewdidload];     // additional setup after loading view. } -(ibaction)insert:(id)sender {     nsmanagedobjectcontext *moc=[[self appdelegate] managedobjectcontext];     stringdates *entity=[nsentitydescription insertnewobjectforentityforname:@"stringdates" inmanagedobjectcontext:moc];     entity.unused=inserttextfield.text;     entity.message=@"123456789";     nserror *error;     [moc save:&error];     [inserttextfield resignfirstresponder];  } -(nsfetchedresultscontroller *)fetchedresultscontroller {      nsmanagedobjectcontext *moc = [[self appdelegate] managedobjectcontext];      if (moc == nil) return nil;     nsentitydescription *entity = [nsentitydescription entityforname:@"stringdates" inmanagedobjectcontext:moc];     nssortdescriptor    *sd1    = [[nssortdescriptor alloc] initwithkey:@"unused" ascending:yes];      nsarray *sortdescriptors    = [nsarray arraywithobjects:sd1,nil];      nsfetchrequest *fetchrequest = [[nsfetchrequest alloc] init];      [fetchrequest setentity:entity];     [fetchrequest setsortdescriptors:sortdescriptors];      fetchedresultscontroller = [[nsfetchedresultscontroller alloc] initwithfetchrequest:fetchrequest managedobjectcontext:moc sectionnamekeypath:@"unused" cachename:nil];      [fetchedresultscontroller setdelegate:self];         nserror *error = nil;     if (![fetchedresultscontroller performfetch:&error])     {         nslog(@"error performing fetch: %@", error);     }       return fetchedresultscontroller;    } - (void)controllerdidchangecontent:(nsfetchedresultscontroller *)controller {     [stringdatestableview reloaddata];  }  -(nsinteger)numberofsectionsintableview:(uitableview *)tableview {        return [[[self fetchedresultscontroller] sections] count]; } -(nsinteger)tableview:(uitableview *)tableview numberofrowsinsection:(nsinteger)section {        nsarray *sections = [[self fetchedresultscontroller] sections];      if (section < [sections count])     {         id <nsfetchedresultssectioninfo> sectioninfo = [sections objectatindex:section];          return sectioninfo.numberofobjects;     }      return 0; } -(uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {     //static nsstring *cellidenitifier=@"cell";       stringdates *userrecentchat=[[self fetchedresultscontroller] objectatindexpath:indexpath];      uitableviewcell *cell=[tableview dequeuereusablecellwithidentifier:nil];      if(cell==nil)     {         cell=[[uitableviewcell alloc] initwithstyle:uitableviewcellstylesubtitle reuseidentifier:nil];     }      cell.detailtextlabel.text=userrecentchat.message;     return  cell; }  - (nsstring *)tableview:(uitableview *)tableview titleforheaderinsection:(nsinteger)section {      nsarray *sections = [[self fetchedresultscontroller] sections];      if (section < [sections count])     {         id <nsfetchedresultssectioninfo> sectioninfo = [sections objectatindex:section];         return sectioninfo.name;      }     return @""; }

but dates strings not coming either asending order or descendibg order.can solve problem.thanks inadvance.

you use nsdateformatter object create nsdate objects , store coredata. sort them ascending/descending using nssortdescriptor.

just take quick nsdateformatter reference https://developer.apple.com/library/mac/#documentation/cocoa/reference/foundation/classes/nsdateformatter_class/reference/reference.html

and dateformattingguide: https://developer.apple.com/library/mac/#documentation/cocoa/conceptual/dataformatting/dataformatting.html#//apple_ref/doc/uid/10000029i

it's super easy do.


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