uitableview - Understanding a logic in update/add - NSUserDefaults (Objective C) -

i'm writing nice class handle call block in nsuserdefaults. haven't tested yet, think miss regarding update/add callblockid. code:

my code:

@implementation userdefaulthandler  + (userdefaulthandler *)sharedinstance {     static userdefaulthandler *instance;      static dispatch_once_t oncetoken;     dispatch_once(&oncetoken, ^{         instance = [[userdefaulthandler alloc] init];     });      return instance; }  -(void)updateoraddcallblock:(nsmutabledictionary*)callblockobject {     nsstring *callblockid = [callblockobject objectforkey:@"callblockid"];     bool needtoupdate = no;     nsinteger indexdict = 0;     nsmutablearray *arrayofallcallblock = [[nsmutablearray alloc] init];     arrayofallcallblock = (nsmutablearray*)[[nsuserdefaults standarduserdefaults] objectforkey:@"arrayofallcallblock"];     nsmutabledictionary *newdict = [[nsmutabledictionary alloc] init];      if (arrayofallcallblock.count <= 0 || arrayofallcallblock == nil)     {         [arrayofallcallblock addobject:callblockobject];     }      else     {         (int = 0; < arrayofallcallblock.count; i++)         {             nsmutabledictionary *mutabledict = [arrayofallcallblock objectatindex:i];             nsstring *idfromdict = [mutabledict objectforkey:@"callblockid"];              if ([idfromdict isequaltostring:callblockid])             {                 needtoupdate = yes;                 indexdict = i;                 newdict = mutabledict;             }         }          if (needtoupdate)         {             [arrayofallcallblock removeobjectatindex:indexdict];             [arrayofallcallblock insertobject:newdict atindex:indexdict];         }         else         {             [arrayofallcallblock addobject:callblockobject];         }     }      [self saveglobaldict:arrayofallcallblock]; }  - (nsmutabledictionary *)getcallblockbyid:(nsstring*)callblockid {     nsmutablearray *arrayofallcallblock = (nsmutablearray*)[[nsuserdefaults standarduserdefaults] objectforkey:@"arrayofallcallblock"];     bool isfound = no;     nsinteger indexdict = 0;     nsmutabledictionary *newdict = [[nsmutabledictionary alloc] init];      (int = 0; < arrayofallcallblock.count; i++)     {         nsmutabledictionary *mutabledict = [arrayofallcallblock objectatindex:i];         nsstring *idfromdict = [mutabledict objectforkey:@"callblockid"];          if ([idfromdict isequaltostring:callblockid])         {             isfound = yes;             indexdict = i;             newdict = mutabledict;         }     }      if (isfound)     {         return newdict;     }     else      {         return nil;     } }  - (nsmutablearray*)getallcallblock {     nsmutablearray *arrayofallcallblock = (nsmutablearray*)[[nsuserdefaults standarduserdefaults] objectforkey:@"arrayofallcallblock"];     return arrayofallcallblock; }  - (void)clearcallblockdb {     [[nsuserdefaults standarduserdefaults] removeobjectforkey:@"arrayofallcallblock"];     [[nsuserdefaults standarduserdefaults] synchronize]; }  - (void)saveglobaldict:(nsmutablearray*)globalarray {     self.globalarray = [[nsmutablearray alloc] init];     self.globalarray = globalarray;     [self clearcallblockdb];     [[nsuserdefaults standarduserdefaults] setobject:self.globalarray forkey:@"arrayofallcallblock"];     [[nsuserdefaults standarduserdefaults] synchronize]; }  - (void)clearsinglecallblock:(nsstring*)callblockid {     nsmutablearray *array = [[nsmutablearray alloc] init];     array = [self getallcallblock];     nsmutabledictionary *specificdict = [[nsmutabledictionary alloc] init];     nsinteger getindex = [self getindexforcallblock:array specificdict:specificdict];     [array removeobjectatindex:getindex];     [self saveglobaldict:array]; }  - (nsinteger)getindexforcallblock:(nsmutablearray*)arrayofallcallblock specificdict:(nsmutabledictionary*)specificdict {     nsinteger getindex = 0;     (int = 0; < arrayofallcallblock.count; i++)     {         nsmutabledictionary *mutabledict = [arrayofallcallblock objectatindex:i];          nsdictionary *dict_one = [specificdict copy];         nsdictionary *dict_two = [mutabledict copy];          if ([dict_two isequaltodictionary:dict_one])         {             getindex = i;         }     }      return getindex; }  @end 

i'll explain: i've uitableview , when add row it, i've new window put details, save , present in uitableview. also, i've edit button can edit , update row in table. adding row table create unique string (callblockid). i'm not sure how handle , whether or not code enough.

any ideas?