I am newcomer in Objective-C and have experience only 5 months in iPhone development.
What I need:
I need to concatenate 2 or more
You should probably look into this post for doing the same: Combine two audio files into one in objective c
The answer is similar to what Dimitar has suggested. But 2 important things that you have to keep in mind are that, first - it works only for mp3 format and second the bit-rate of all the files that you are trying to concatenate should be same, or else only parts of your file would play in the final output. It would stop playing where the bit rate changes.
SSteve- Files like Wav files have their own headers and if you just write one file after another, It would play just the first file and would then stop playing, inspite that the file info showing a greater file size. this is because we do not have information updated into the header of the first file.