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This is getting to be a bit of a pain. Every time Xcode is updated (which after Xcode 5 has been a lot) I have to reinstall Xamarin Studio on my Mac.
Please place the whatever-it-is-that-makes-it-work somewhere where Xcode's updates can't destroy it.
Alternatively, instead of bleating that it can't build my iOS project any more, please have Xamarin Studio download the relevant stuff and fix the problem itself.
The current situation is a nasty productivity killer.
What errors are you getting? I've never had to reinstall after updating Xcode...
I updated Xcode 5 to its latest version yesterday.
When I opened my iOS projects in Xamarin Studio, they were coloured red and weren't able to build.
A message came up saying something like "you need to install Xamarin for iOS, please download it from Xamarin.com" (can't remember the exact wording, sorry).
I went to the site, downloaded the dmg, opened it, ran the installer, and now my iOS projects are build able again.
Maybe Xcode deleted /Developer/MonoTouch? I dunno.
Seems like it wipes out something that Xamarin needs. Hence the request for Xamarin to either reinstall automatically (it knows what's missing, after all, and it tells me where to go get it!) or to store that critical piece somewhere where Xcode won't touch it.
It's been years since I've seen this happen.
Did you happen to have an old version of Xcode in /Developer (~v4.2 I believe was the last version to be installed there)?
No, this issue is all about Xcode 5. Bog-standard install, downloaded from Apple, etc.
It's been happening since Xcode 4, but the present problems also persist with Xcode 5.
This is resolved with Xamarin.iOS 7.4 (we install into /Library/Frameworks/Xamarin.iOS.framework instead of /Developer).