ios - Problems Saving NSMutableArray with custom objects -

i have class called currentuser, holds nsmutablearray called listoffriends. listoffriends holds objects class friends.

both currentuser , friend classes have nscoding protocols handled. friend object has property called userimg, uiimage. there's 1 problem. when try load lisoffriends, friends don't come uiimages.

if save friend, , try load again, comes uiimage no problem. if object inside listoffriends, doesn't come uiimage, other informations loaded correctly.

my question is: how can store , load nsmutablearray custom objects? declaration of friendlist:

currentuser.h

@property (nonatomic,strong)nsmutablearray *friendslist; 

currentuser.m

  - (void) encodewithcoder:(nscoder *)encoder {     [encoder encodeobject:username forkey:@"username"];     [encoder encodeobject:friendslist forkey:@"friendslist"];     //testing direct friend saving     [encoder encodeobject:[friendslist objectatindex:0] forkey:@"testfriend"];     [encoder encodeobject:_userpsw forkey:@"userpassword"];     [encoder encodeobject:uiimagepngrepresentation(userimg) forkey:@"userimg"];     [encoder encodeobject:userid forkey:@"userid"];     [encoder encodeobject:groups forkey:@"groups"];     [encoder encodeobject:_email forkey:@"email"];  }  - (id)initwithcoder:(nscoder *)decoder {     currentuser *returnuser = [[currentuser alloc] init];     returnuser.username = [decoder decodeobjectforkey:@"username"];     returnuser.email = [decoder decodeobjectforkey:@"email"];     //testing direct friend loading     friend *testfriend = [decoder decodeobjectforkey:@"testfriend"];     returnuser.userpsw = [decoder decodeobjectforkey:@"userpassword"];     returnuser.userimg = [uiimage imagewithdata:[decoder decodeobjectforkey:@"userimg"]];     returnuser.friendslist = [decoder decodeobjectforkey:@"friendslist"];     returnuser.userid = [decoder decodeobjectforkey:@"userid"];     returnuser.groups = [decoder decodeobjectforkey:@"groups"];      return returnuser; } 

friend.m

- (void)encodewithcoder:(nscoder *)encoder{       [encoder encodeobject:uiimagepngrepresentation(userimg) forkey:@"friendimg"];     [encoder encodeobject:username forkey:@"friendun"];     [encoder encodeobject:userid forkey:@"friendid"];  }  - (id)initwithcoder:(nscoder *)decoder{     friend *obj = [[friend alloc]init];     obj.username = [decoder decodeobjectforkey:@"friendun"];     obj.userimg = [uiimage imagewithdata:[decoder decodeobjectforkey:@"friendimg"]];     obj.userid = [decoder decodeobjectforkey:@"friendid"];     return obj;  } 

this object have save , load currentuser, it's called "configurations". configurations.h

#import "currentuser.h" @interface configurations : nsobject - (currentuser*)loadcustomobject; - (void)savecustomobject:(currentuser *)object;  @end 

configurations.m

#import "configurations.h"  @implementation configurations - (void)savecustomobject:(currentuser *)object {     nsdata *encodedobject = [nskeyedarchiver archiveddatawithrootobject:object];     nsuserdefaults *defaults = [nsuserdefaults standarduserdefaults];     [defaults setobject:encodedobject forkey:@"lastuser"];     [defaults synchronize];  }  - (currentuser*)loadcustomobject {     nsuserdefaults *defaults = [nsuserdefaults standarduserdefaults];     nsdata *encodedobject = [defaults objectforkey:@"lastuser"];     currentuser *object = [nskeyedunarchiver unarchiveobjectwithdata:encodedobject];     return object; } @end 

this how i'm loading currentuser.

saver = [[configurations alloc]init]; currentuser *tmpuser = [saver loadcustomobject]; thisuser = [currentuser instance];  static dispatch_once_t once; dispatch_once(&once, ^ {         if(tmpuser != nil){             if(![tmpuser.username isequaltostring:@""]){               for(friend *savedfriend in tmpuser.friendslist)             {                 [thisuser addfriend:savedfriend];             }                 thisuser.username = tmpuser.username;                 thisuser.email = tmpuser.email;                 thisuser.userid = tmpuser.userid;                 thisuser.userpsw = tmpuser.userpsw;                 thisuser.userimg = tmpuser.userimg; }); 

your initwithcoder: methods incorrect. need in following pattern:

- (instancetype)initwithcoder:(nscoder *)decoder {     self = [super init]; // or [super initwithcoder:decoder] if appropriate     if (self) {         _someivar = [decoder decodeobjectforkey:@"somekey"];         _someotherivar = [decoder decodeobjectforkey:@"someotherkey"];     }      return self; } 

fixing initwithcoder: method both currentuser , friend classes lot.

currentuser:

- (id)initwithcoder:(nscoder *)decoder {     self = [super init];     if (self) {         _username = [decoder decodeobjectforkey:@"username"];         _email = [decoder decodeobjectforkey:@"email"];         //testing direct friend loading         friend *testfriend = [decoder decodeobjectforkey:@"testfriend"];         _userpsw = [decoder decodeobjectforkey:@"userpassword"];         _userimg = [uiimage imagewithdata:[decoder decodeobjectforkey:@"userimg"]];         _friendslist = [decoder decodeobjectforkey:@"friendslist"];         _userid = [decoder decodeobjectforkey:@"userid"];         _groups = [decoder decodeobjectforkey:@"groups"];     }      return self; } 

friend:

- (id)initwithcoder:(nscoder *)decoder {     self = [super init];     if (self) {         _username = [decoder decodeobjectforkey:@"friendun"];         _userimg = [uiimage imagewithdata:[decoder decodeobjectforkey:@"friendimg"]];         _userid = [decoder decodeobjectforkey:@"friendid"];     }      return self; }