Xcode 8 – IB Designables – Failed to render and update auto layout status, The agent crashed

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You can try one of the following to figure out the cause:

  1. look for the IBDesignablesAgentCocoaTouch logs in this directory:
    ~/Library/Logs/DiagnosticReports and see the cause.

Note: for user with Catalina: look for
IBDesignablesAgent-iOS_<DATE>-<MAC_NAME>.crash

  1. Go to the Editor -> Debug Selected View while selecting your @IBDesignable UIView in your storyboard, and see the stack trace.

  2. Delete Derive Data folder. 

    Xcode Preference -> Location -> Derived Data
/Users/YourMacName/Library/Developer/Xcode/DerivedData

  3. Clean your project Shift + Command + Alt + K.

  4. Build your project Command + B.

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