ios - How to create a dynamic size array -

what trying achieve:

i have uitableview , want check whether table selected or not , keep in array easy access yes or no values corresponds row afterwards can manipulate data.

my code follows

- (void) tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath {     nsuinteger row = [indexpath row];      uitableviewcell *cell = [tableview cellforrowatindexpath:indexpath];     nsstring *celllabeltext = cell.textlabel.text;      if (cell.accessorytype == uitableviewcellaccessorycheckmark) {         cell.accessorytype = uitableviewcellaccessorynone;         selected[row] = no;     }     else {         cell.accessorytype = uitableviewcellaccessorycheckmark;         selected[row] = yes;     }   } 

as stands out can create bool selected[some value] problem max index needed me unknown table size changes constantly. setting max index limits me.

i new objective c , come php background dont know whether possible create array want in objective-c.

otherwise options within objective-c have easy way easy write/read selected[row] = yes/no.

i need way write yes/no , link indexpath.row

use nsmutableset , store nsindexpath of selected rows. if select row add path set. if unselect row, remove path set.

to see if row selected, see if indexpath in set or not.

btw - works if rows fixed. if user can add, remove, or reorder rows approach not work. in such case need store data keys, not index paths.

create ivar of type nsmutableset. let's call selectedrows:

selectedrows = [[nsmutableset alloc] init]; 

then in didselectrow do:

- (void) tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath {     bool selected = [selectedrows containsobject:indexpath];      uitableviewcell *cell = [tableview cellforrowatindexpath:indexpath];     nsstring *celllabeltext = cell.textlabel.text;      if (selected) {         cell.accessorytype = uitableviewcellaccessorynone;         [selectedrows removeobject:indexpath];     } else {         cell.accessorytype = uitableviewcellaccessorycheckmark;         [selectedrows addobject:indexpath];     }   } 

in cellforrow... method similar:

bool selected = [selectedrows containsobject:indexpath]; cell.accessorytype = selected ? uitableviewcellaccessorycheckmark : uitableviewcellaccessorynone;