objective c - NSTableView edits not changing NSMutableArray -

i have class stores strings along bool flag set yes if 1 of strings has been updated.

i have nstableview displays strings in class. view controlled via separate controller class , view fed nsmutablearray.

the gui stuff seems work fine in terms of displaying data , allowing me edit cells in table view. problem having edits don't change objects stored in nsmutablearray. have debug code print out strings when close app, , none of changes made in gui show in objects @ point. setting break point values changed shows me objects indeed changed, changes seem lost. how can changes make in view persist in object stored in nsmutablearray backing nstableview?

here how coding:

// class .h file  @interface snip : nsobject <nsmutablecopying>  @property (assign) int64_t  id_num; @property (assign) bool     changed; @property nsmutablestring   *name; @property nsmutablestring   *text; @property (copy) nsstring   *language;   // class .m file  import "snip.h"  @implementation snip  @synthesize id_num; @synthesize name; @synthesize text; @synthesize changed; @synthesize language; 

method controller class

// edit table values -(void)tableview:(nstableview *)tableview setobjectvalue:(id)object fortablecolumn(nstablecolumn *)tablecolumn row:(nsinteger)row {   snip *sn = [snippet_list objectatindex:row];    [sn setchanged:yes];    [sn setvalue:object forkey:[tablecolumn identifier]];    nslog(@"change: %@",sn.name); } 

that last nslog statement displays change made in gui. also, setchanged:yes lost when print nsmutablearray contents when closing app.

this behaviour due data being initialised again @ point after being changed user.

you can catch problem setting breakpoint (or nslog statement) in initialisation code.