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Question

how to copy an NSMutableArray to anotherNSMutableArray

Answer 1

A:

Did you initialize your self.data at all? I.e. self.data = [NSMutableArray array]; somewhere.

If you did, please post some code.

Eiko 2010-08-22 20:36:15

self.data = [NSArray arrayWithContentsOfFile:dataPath];its load from plist, which could be empty at first. i save some table cell contents to another temp array. and than i would like to save it to self.data.

Stefan 2010-08-22 20:43:12

or here is what i am trying to do: selected a table cell, save it to array and before controller exit save array to file. now implement an alertview, if its ok is press than the table cell will be save to array. i can only thinking of using a temp array to save the table cell 1st, and when ok is press, transfer the temp array to original array. or is there other better ways?

Stefan 2010-08-22 21:03:31

If you edit your question to include the code that would help greatly.

Eiko 2010-08-22 21:46:50

Answer 2

A:

- (NSArray *)arrayByAddingObjectsFromArray:(NSArray *)otherArray

is the method your looking for.

ennuikiller 2010-08-22 20:37:15

This gives a new array instead of reusing the existing one. Why should he want to use this over the other?

Eiko 2010-08-22 20:52:39

this method doesnt seems to work

Stefan 2010-08-22 21:06:57

@Stefan, why don't you tell us what "doesn't seem to work" means.

Firoze Lafeer 2010-08-22 21:19:26

hi there, self.temparray is not copying to self.data array.i type the following code only: [self.data arrayByAddingObjectsFromArray:self.tempArray];no errors, but its not copying. thks

Stefan 2010-08-22 21:25:15

whats the output of [self.tempArray count] ?

ennuikiller 2010-08-22 21:30:10

@Stefan, what are you doing with the array that is returned by -[NSArray arrayByAddingObjectsFromArray]. Are you sure you're not just throwing the new array away?Also, when you say "copy" are you trying to add all the elements of tempArray to self.data? Or are you trying to replace all the elements of self.data with the objects from tempArray?

Firoze Lafeer 2010-08-22 21:41:06

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