HOw do I reverse sync iphone's calendar with ical on my mac?

Question

I think I must have selected Mac to iPhone when syncing the first time and now it's set in perpetuity - I can't even merge my calendars, can only enter it all on my Mac's iCal for transfer to my iPhone calendar. If I enter data on my iPhone, then sync, it gets dumped.
So - how can I reset iTunes to make my device primary and Mac secondary? Or how can I reverse sync?

Answer 1

I found two solutions to this problem on a similar discussion topic.
angelbane suggested:
Posts: 3
Registered: Oct 7, 2009
Re: iPhone does not sync to iCal
Posted: Jul 15, 2010 8:49 PM in response to: jumpinjs
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I just got mine to sync right
I went into isync -> Preferences -> Reset Sync History.
after that all of my sync issues went away
I was having issues with iCal and and appigo sync
Mac OS X (10.6)
and the second one (I used this to solve the problem of syncing in both directions every time):
MacFabio suggested
Posts: 1
From: San Francisco, CA
Registered: Jul 21, 2010
Re: iPhone does not sync to iCal
Posted: Jul 21, 2010 8:07 PM in response to: bboot
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I also experienced the same problem, i.e. iCal not syncing with iPhone. Contrary to most other users who experienced this problem, for me it appeared after updating the MacOS to 10.6.4, long before I updated the iPhone to OS4.
Now, thanks to janice0927 suggestion, it perfectly works, but I had to do one more thing in order to solve the problem:
Reset the sync history on your Mac. This is done in the iSync (located in the Application folder) preferences. After selecting "reset sync history", restart your Mac.
Afterward, follow the same procedure janice0927 suggested. For your convenience, I copied the steps here below:
1. You are going to be pushing your calendar from ical onto your iphone so you will lose any events that are currently on your iphone but not on ical -- you will need to update ical manually to ensure you don't lose anything important.
2. Scroll down in the info tab in itunes to the Advanced options at the bottom -- where it says replace the information on my iphone and select calendar.
3. Sync, check that your iphone calendar matches your ical calendar
4. Add a new test event to the iphone (the selection you made in advanced should have automatically deselected after you sync'd but check just to make sure)
5. Sync again -- check if your test event was transferred.
Good Luck!
iMac (intel - 2007) Mac OS X (10.6.4) iPhone 3G (OS4)
Hope these work for any of you having the sync problem.
Deuce