iPhone Simulator 3.x not listed after upgrading to XCode 3.2.3 Beta4 with OS 4.0

Question

When I last installed Xcode 3.2.3 Beta 2 (OS 4.0 support), it had all the iPhone Device & Simulator 3.x.

Now, updated to Xcode 3.2.3 Beta 4 (OS 4.0 support), it no longer lists 3.x SDKs for either simulator or device in XCode. When I run an app that was written for 3.1.2, the current SDK is listed as "base SDK missing"

I'm aware that 3.2.3 changes the BASE SDK to 4.0, but how come none of the 3.x devices are available either?

When I go to:

/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs

The only two files available are:

iPhoneSimulator3.2.sdk
iPhoneSimulator4.0.sdk

However, when I go to:

/Developer/Platforms/iPhoneOS.platform/DeviceSupport

3.0
3.0.1
3.1
3.1.1
3.1.2
3.1.3
3.2
4.0 (8A274b)

I've tried re-installing the most recent XCode DMG to no avail.

Answer 1

You should read: http://www.clarkcox.com/blog/2009/06/23/sdks-and-deployment-targets/ This explains very nicely the difference between the Base SDK and Deployment Target -- in short, the Base SDK is the highest SDK version you expect to support, whereas the Deployment Target is the lowest version you will support. You need to make sure both are properly selected, and that your code will support the functionality from those SDKs properly.

Answer 2

It seems like they removed them.

If you are developing for the older OS, you should not be using the 4.0 Beta SDK.

According to the release notes:

iPhone OS 4 beta 4 is for development purposes only. This software should only be installed on devices dedicated exclusively for iPhone OS 4 beta application development. Do not install this software if you do not have a device dedicated exclusively to iPhone OS 4 beta application development.

I would recommend you install the 3.x sdk in parallel to the 4.0. I keep the two Developer directories on my machine /Developer for maintaining apps written for 3.0 and 3.1, and /Developer4.0Beta for migrating apps to 4.0, and trying out the new features that will be available soon.

The option to install to another folder is a bit hard to notice when installing the sdk, but the trick is to hit the up/down arrows by the default directory on the 'Installation Type' step. After hitting them it will allow you to choose a different directory.

Remember, that App;le won't allow you to submit an App built with a Beta SDK, so I would only use the 4.0 Beta for building 4.0 Apps, keeping in mind that the APIs might still change before the GM is released.

Answer 3

Yeah, I was just banging my head against this one for a while too. It turns out you need to modify your project settings (right-click project > "Get Info") here:

XCode project settings http://img.skitch.com/20100609-fk9aq46eyibf4ceftr6famdbt9.png

It will probably say "3.1 (missing)" since they removed that from XCode 3.2.3. Change it to 3.2 or 4.0 and you should be up & running again.