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[iOS] Possible race condition when setting Switch background color #10101

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fpaaske opened this issue Nov 21, 2022 · 1 comment
Open
3 tasks done

[iOS] Possible race condition when setting Switch background color #10101

fpaaske opened this issue Nov 21, 2022 · 1 comment
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bug-pending-triage Reported bug, pending triage to confirm.

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@fpaaske
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fpaaske commented Nov 21, 2022 •
edited by rigor789
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Issue Description

We experience a null pointer exception in our app, and it seems to be related to Switch and background color.
It looks suspiciously similar to this NativeScript/nativescript-angular#2134 and #9922, but for iOS.

Reproduction

I'm unable to reliably reproduce this.

Relevant log output (if applicable)

TypeError: Cannot set property 'onTintColor' of null
at Switch.setNativeBackgroundColor
at Switch._onCheckedPropertyChanged
at onCheckedPropertyChanged
at Switch.checked
at ViewUtil.setPropertyInternal
at ViewUtil.setProperty
at EmulatedRenderer.setProperty
at ZoneDelegate.invoke
at Zone.run

Environment

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@fpaaske fpaaske added the bug-pending-triage Reported bug, pending triage to confirm. label Nov 21, 2022
@fpaaske
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fpaaske commented Apr 25, 2023

A small update on this, it seems like this is only happening when binding to (tap) instead of (checkedChange).

The reason for binding to tap was to avoid a call to checkedChange during initialization, like mentioned in these SO posts:

https://stackoverflow.com/questions/41118760/nativescript-switch-prevent-change-event-firing-on-initial-binding
https://stackoverflow.com/questions/40914604/nativescript-switch-not-to-fire-initial-binding

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