SwiftUI: onPreferenceChange not called if view contains if statement

UI Frameworks SwiftUI
Jantosko OP
Created Jul ’23
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Hi,

I'm trying to build iOS app, but I found out that .onPreferenceChange has strange behaviour if the view contains an if statement below view which sets .preference.

Here is an repository with minimal reproduction: https://github.com/Mordred/swiftui-preference-key-bug

There should be displayed title text on the top and bottom of the screen. But the bottom is empty.

If you delete if statement if true { at https://github.com/Mordred/swiftui-preference-key-bug/blob/main/PreferenceKeyBug/PreferenceKeyBug.swift then it works fine.

Replies  1
Boosts  4
Views  778
Participants  2
agkevin OP
4w

I recommend filing this feedback with the Feedback app to ensure it gets seen by the right team within Apple.

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SwiftUI: onPreferenceChange not called if view contains if statement
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