objective c - Create/Edit .doc .xls files on the iPhone/iPad -

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i know .doc , .xls can viewed using uiwebview want make app edit .doc , .xls files. enlighten me on how should this? or library can use or buy.

i believe can utilize googls docs api.

http://code.google.com/apis/documents/

http://code.google.com/apis/spreadsheets/


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