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Installation of Xcode 9 is now totally and completely different from previous versions.

The previous 100s of explanations on the net and on SO of how to do this pre-8 are no longer useful

After this dialog,

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Xcode9 wants to make changes.

In fact, will it erase my 8.3.3 ?

Do you have to "move 8.3.3 to another folder, before clicking that button?"

What really is the best pipeline to have both 8.3.3 and 9 ?

Considering the magnificent answer of emlai below,

a further subtlety is that Xcode9 then wants to ...

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will it hork the Xcode8 components and tools????

Interestingly, I found that running Xcode9 once happened to eliminate all the simulators for my Xcode 8 installation!

enter image description here

Fattie
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    Possible duplicate of [Can I have multiple Xcode versions installed?](https://stackoverflow.com/questions/669367/can-i-have-multiple-xcode-versions-installed) – Suhaib Jul 26 '17 at 14:20
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    hi @Suhaib, please please please do not mark as a duplicate. **The system is now totally different with Xcode 9**. Can you please remove the duplicate, because bypassers just click "duplicate" when they see a "duplicate" flag. – Fattie Jul 26 '17 at 14:22
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    I don't know how to remove it. But no need to worry, I have submitted around 100 dups flags for iOS questions and not a single one of them got closed. Anyway it says: `possible dup`. So it can be considered more like a reference than a flag :-) – Suhaib Jul 26 '17 at 14:26
  • @Rob - fair enough man. But I just found for example it erased all my simulators from 8. Not a big deal but someone with mini-bandwidth will be crying about this. – Fattie Jul 26 '17 at 14:51
  • There is one problem. The Xcode 8 and Xcode 9 share the same preference. – Bagusflyer Jun 11 '18 at 14:21

3 Answers3

8

In fact, will it erase my 8.3.3 ?

No.

Do you have to "move 8.3.3 to another folder, before clicking that button?"

No.

Beta Xcodes are named Xcode-beta.app so you can keep them in the same applications folder as the non-beta version.

Emil Laine
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From the first page of the Xcode 9 release notes:

Xcode 9 ... can coexist with previous versions of Xcode.

matt
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    Another magnificent answer. – Fattie Jul 26 '17 at 14:24
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    Just don't _run_ them simultaneously. – matt Jul 26 '17 at 14:26
  • Brilliant. What do you say to my added note at the bottom of the question - is there a danger of horking the command line tools? (I assume not, but a zillion googlers will come here, and you're the expert! :) ) – Fattie Jul 26 '17 at 14:27
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    @Fattie - See "Xcode" » "Preferences" » "Command line tools". – Rob Jul 26 '17 at 14:34
  • There isn't any "danger" of anything. I am using Xcode 9 beta 4, Xcode 9 beta 3, and Xcode 8.3, right now. End of story. – matt Jul 26 '17 at 14:54
  • So, is this still true with Xcode 9 Gold Master (production).... I just downloaded Xcode 9 xip and have unpacked it.... not I am really nervous about running and configuring it since I have a large project on 8 which I am not ready to migrate, But I also need 9 for different project. – Anjan Biswas Oct 04 '17 at 19:37
  • Yes, perfectly true. I'm still running both alternately. The old version is in a folder so there's no name conflict. (If I were you, though, I'd go straight for Xcode 9.1 beta and skip Xcode 9 altogether.) – matt Oct 04 '17 at 19:39
  • @matt thanks. I will go straight for 9.1 beta then. good stuff. – Anjan Biswas Oct 04 '17 at 19:42
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After Xcode 9 beta installation, all the simulators were gone.

To solve this, I removed the beta from the Applications folder and started using it from the desktop. The simulators reappeared in Xcode 8.

Then I moved the .app to the Applications folder again and all is working fine. I can even use both versions at the same time.

Julio Batista Silva
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