Inserting "£" in a string to a text file

iPhone Application writes data to a text file, saves it on the Documnets folder. Great that works

If I place "£" in the string, or use [currencyStyle stringFromNumber] the text file will not be created.

The "£" and the [currencyStyle stringFromNumber] works if the inform开发者_运维百科ation is printed to a "New View" page on the simulator, pound and all

Can someone please explain what's happening?

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Make sure you're writing your string to the text file with the proper encoding. If you use the -writeToFile:atomically:encoding:error: method of NSString, you should pass NSUTF8Encoding as the encoding argument. You should not use the deprecated -writeToFile:atomically: method.