While selecting a framework rather than the executable as the active scheme,
SwiftUI preview cannot use: Updating took more than 5 seconds.
However, while selecting the main app target, it can work perfectly.
Repro steps:
git clone https://github.com/imWildCat/NonExecutableTargetCannotUseSwiftUIPreviewDemo
cd NonExecutableTargetCannotUseSwiftUIPreviewDemo
xed NonExecutableTargetCannotUseSwiftUIPreviewDemo.xcworkspace
Select the “SharedUI” target as the active scheme
Open the WebImage.swift source file
Run the SwiftUI preview
Please note that, if you use the main app target (executable rather than the frame), it can be previewed.
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