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Defer the selection of the feed and article on state restoration to avoid crashes on iPad's running iOS 15 in landscape mode as they restore article selected state. Fixes #3201

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This commit is contained in:
Maurice Parker 2021-09-11 14:28:00 -05:00
parent fe080b8ddc
commit 25946f3c5a
1 changed files with 22 additions and 3 deletions
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25
iOS/SceneCoordinator.swift
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@ -157,6 +157,21 @@ class SceneCoordinator: NSObject, UndoableCommandRunner, UnreadCountProvider {
private var exceptionArticleFetcher: ArticleFetcher?
private(set) var timelineFeed: Feed?
// We have to defer the selecting of the feed and article due to a behavior (bug?) in iOS 15.
// iOS 15 will crash if you are in landscape on an iPad and are restoring article state. We
// have no idea why this is, but it happens when you do a select on a UITableView right before
// doing a diffable datasource apply.
//
// Steps to recreate:
//
// * Try to relaunch the app in the sim.
// * Press the Stop button in Xcode
// * Wait for all the app suspension activities to complete (widget data, etc)
// * Once the article has loaded, navigate to the iPad home screen
// * While in landscape, select a feed and then select an article
// * Install a fresh build of NNW to an iPad simulator (11 or 12.9' will do) running iPadOS 15
private var deferredFeedAndArticleSelect: (feedIndexPath: IndexPath, articleID: String)?
var timelineMiddleIndexPath: IndexPath?
private(set) var showFeedNames = ShowFeedName.none
@ -438,6 +453,12 @@ class SceneCoordinator: NSObject, UndoableCommandRunner, UnreadCountProvider {
}
rebuildBackingStores(initialLoad: true)
treeControllerDelegate.resetFilterExceptions()
if let (feedIndexPath, articleID) = deferredFeedAndArticleSelect {
selectFeed(indexPath: feedIndexPath) {
self.selectArticleInCurrentFeed(articleID)
}
}
}
@objc func unreadCountDidChange(_ note: Notification) {
@ -2279,9 +2300,7 @@ private extension SceneCoordinator {
func selectFeedAndArticle(feedNode: Node, articleID: String) -> Bool {
if let feedIndexPath = indexPathFor(feedNode) {
selectFeed(indexPath: feedIndexPath) {
self.selectArticleInCurrentFeed(articleID)
}
deferredFeedAndArticleSelect = (feedIndexPath, articleID)
return true
}
return false