iphone - How to add value into array overtime user click on next button in xcode? -

when user click next button, generate random number , store number array. array storing last number only. should initialize array outside 'next' function? moreover, 'back button' read array last in number. please advise.

- (ibaction)next:(id)sender {      // additional setup after loading view nib.      //generate random number - result range of 0-10        int randomnumber = (arc4random() % 10);     // add random number array    [myarray addobject:[nsnumber numberwithint:randomnumber]];      // easy way in array         nslog([myarray description]);       nsstring *filename = [nsstring stringwithformat:@"file_no_%d", randomnumber +1];      //render complete file-path out of our filename, main-bundle , file-  extension      nsstring *filepath=[[nsbundle mainbundle] pathforresource:filename oftype:@"txt"];      //fetch text content file      nsstring *mytext= [nsstring stringwithcontentsoffile:filepath                                                 encoding:nsutf8stringencoding                                                    error:nil];      //hand text on our textview      textview.text=mytext; }  - (ibaction)back:(id)sender {      nsnumber *last_array_num = [myarray objectatindex:myarray.count - 1];     // read file name based on last number in array      nsstring *filename = [nsstring stringwithformat:@"file_no_%d", last_array_num ]; } 

you initializing array within next method adding it? if so, array needs initialized outside method, , once. keeps data intact, otherwise overwritten when initialize next time.

you adding array fine, doesn't need change @ all. reading number in method, need have following line of code:

edit: code use results want array. also, formal approach not start capital letters in code unless defines class (like nsstring). methods, this, should use - (ibaction)backbutton:(id)sender instead. it's not big deal @ , code work fine, it's etiquette , keeps code bit less confusing in long run. have feeling might later, i'm letting know ahead of time. anyway, here code want

second edit: thinking, should make variable can read in code. in header file, add this

int arraycount; 

in code, once myarray created, set arraycount

arraycount = [myarray count]; 

this should done if add or remove objects array.

then in action method, can call files

- (ibaction)back:(id)sender {     nsstring *filepath = [nsstring stringwithformat:@"file_no_%d", [[myarray objectatindex:arraycount - 1] intvalue]];      // make sure aren't going beyond bounds of array;     if (arraycount > 1) {         // decrease count of arraycount;         arraycount--;     } } 

using should allow move backwards in array 1 step each time click button. again, if isn't looking for, let me know , bottom of it