Open Radar

 
Summary:
We’re using the new Colors.xcassets catalog and are quite happy with it.
Now, there is an issue when using custom views in Interface Builder

Consider a view like this:

class CustomView: UIView {
    init() {
        self.backgroundColor = UIColor(named: “primaryColor”)!
    }
}

This will crash when used in Interface Builder, because the Colors.xcassets file doesn’t seem to be available and the force unwrap will fail. On devices and in the Simulator this works just fine.

Steps to Reproduce:
1. Create a custom view like above
2. Use it in Interface Builder

Expected Results:
The View should have the background color loaded from the Colors.xcassets catalog

Actual Results:
“IB Designables: Failed to render and update auto layout status for MyViewController (07s-PO-QA4): The agent crashed”


Version:
9.4.1

Notes:
See also this stack overflow question: https://stackoverflow.com/questions/50851953/named-colors-crash-in-interface-builder-builds