IBDesignables don't work at all in an iOS project if it contains a Watch app

Number:rdar://37841641 Date Originated:2018-02-25
Status:Open Resolved:
Product:Xcode Product Version:7.2, 7.3 beta3
Classification: Reproducible:Yes
IBDesignables don't work at all in a project that has a Watch app because the automatic step that build the project for interfacebuilder is broken in this case.

I really hope a fix can be included for this in Xcode 7.3 as this has been broken since 7.2.

Steps to Reproduce:
1. Create a new "iOS App with WatchKit App" project in Xcode
2. Add a custom view and make it designable
3. Use the custom view in a storyboard

Attached is a project prepared in this way and a screenshot that shows the error.

Expected Results:
Xcode builds the project and displays the designable in interface builder

Actual Results:
Xcode fails to build the project with the following message:
target specifies product type 'com.apple.product-type.watchkit2-extension', but there's no such product type for the 'iphonesimulator' platform

7.2 GM and 7.3 beta 3


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