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[ASCollectionView] Add strong Layer Pointer Under iOS < 9 to Workaround Crashes #1861
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…r under iOS < 9 to workaround issue
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aimalygin
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…Image (facebookarchive#1861) * Fix -[ASNetworkImageNode setURL:resetToDefault:] forget to reset animatedImage * add ASNetworkImageNodeTest for reset with animatedImage
aimalygin
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* master_up: (43 commits) Do not expose tgmath.h to all clients of Texture (facebookarchive#1900) Call will / did display node for ASTextNode. Fixes facebookarchive#1680 (facebookarchive#1893) Remove background deallocation helper code (facebookarchive#1890) [Accessibility] Ship ASExperimentalDoNotCacheAccessibilityElements (facebookarchive#1888) 🎉 3.0.0 (facebookarchive#1883) Upgrade to Xcode 11.5 (facebookarchive#1877) Renames AS_EXTERN and ASViewController (facebookarchive#1876) Improve ThreeMigrationGuide.md (facebookarchive#1878) Add a 3.0 migration guide (facebookarchive#1875) I forgot this in the last PR and I'm pushing to master, I'm a bad person. Update for 3.0.0-rc.2 (facebookarchive#1874) Update RELEASE.md (facebookarchive#1873) Fix all the warnings and re-enable on CI (facebookarchive#1872) Prepare for 3.0.0-rc.1 release (facebookarchive#1870) -[ASNetworkImageNode setURL:resetToDefault:] forget to reset animatedImage (facebookarchive#1861) [ASDisplayNode] Implement accessibilityElementsHidden (facebookarchive#1859) Fix documentation for ASCornerRoundingTypeClipping (facebookarchive#1863) Add iOS13 UIContextMenu api to ASCommonCollectionDelegate (facebookarchive#1860) [ASDisplayNode] Implement accessibilityViewIsModal (facebookarchive#1858) Update FBSnapshotTestCase to iOSSnapshotTestCase (=6.2) (facebookarchive#1855) ...
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Under iOS < 9, when a collection view is removed from the hierarchy and being prepared for deallocation, its layer may become a dangling pointer and put the collection view into a dangerous state where pretty much any call will crash.
This shouldn't be possible, since views are supposed to retain their layers, but it happens all the same. This adds a separate strong pointer to ASCollectionView to workaround the issue.
This issue is not technically ASDK-specific, but under ASDK it is far more likely to manifest because of the fact that ASDisplayNode intentionally keeps self alive for the next run loop turn in -didExitHierarchy