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Fabric: Fixing crash in RCTScrollViewComponentView (2nd attempt)
Seems a ScrollView sometimes calls the delegate in own destructor; and seems that in some configurations the delegate is also already destroyed at this point. I am not sure if this a bug in UIKit or not, but seems the fix is easy, we just have to clear the ScrollView's delegate on the delegate's deallocation.
This issue is also looks similar:

Changelog: [iOS] [Fixed] - Fixed crash in RCTScrollViewComponentView

Reviewed By: sammy-SC

Differential Revision: D17924429

fbshipit-source-id: 5727bca9f028e28f76f60304c187ee39eb6e1856
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shergin authored and facebook-github-bot committed Oct 15, 2019
1 parent beae6d6 commit e7ef9921d3f91b02cfec4bbfd88b4968434e201c
Showing 1 changed file with 2 additions and 1 deletion.
@@ -85,7 +85,8 @@ - (instancetype)initWithFrame:(CGRect)frame

- (void)dealloc
[_scrollViewDelegateSplitter removeDelegate:self];
// This is not strictly necessary but that prevents a crash caused by a bug in UIKit.
_scrollView.delegate = nil;

#pragma mark - RCTComponentViewProtocol

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