CODEWITHSUNDEEP
iosswiftuitableviewcrash
Utku Dalmaz
Utku Dalmaz

Reputation: 10162

tableview visibleCells causes crash

override func viewDidDisappear(_ animated: Bool) {
        tableView.visibleCells.forEach {
            if let cell = $0 as? PostsWithVideoCustom , let player = cell.player {
                player.pause()
                cell.player = nil
            }
        }
    }

I use this code on viewDidDisappear and it is ok normally.

However, if I performSegue on viewWillAppear

override func viewWillAppear(_ animated: Bool) {
        if userDefaults.string(forKey: "goToEvent") != nil {
            performSegue(withIdentifier: "postToEvent", sender: self)
        }
       }

I am having crash on line tableView.visibleCells.forEach

How can handle this crash and what may cause it?

UPDATE

This crash only happens if the app started after it gets killed, doesn't happen when waken from background

Crash

Crashed: com.apple.main-thread
0  APP                        0x104521cd4 specialized Posts.viewDidDisappear(_:) (Posts.swift:2127)
1  APP                        0x104519864 @objc Posts.viewWillAppear(_:) + 4334082148
2  UIKitCore                      0x247561684 -[UIViewController _setViewAppearState:isAnimating:] + 488
3  UIKitCore                      0x247562008 -[UIViewController __viewDidDisappear:] + 144
4  UIKitCore                      0x2474c31d8 -[UINavigationController viewDidDisappear:] + 232
5  UIKit                          0x23b4b5ea8 -[UINavigationControllerAccessibility viewDidDisappear:] + 40
6  UIKitCore                      0x247561684 -[UIViewController _setViewAppearState:isAnimating:] + 488
7  UIKitCore                      0x247562008 -[UIViewController __viewDidDisappear:] + 144
8  UIKitCore                      0x247498890 -[UITabBarController viewDidDisappear:] + 100
9  UIKitCore                      0x247561684 -[UIViewController _setViewAppearState:isAnimating:] + 488
10 UIKitCore                      0x247562008 -[UIViewController __viewDidDisappear:] + 144
11 UIKitCore                      0x247564168 __64-[UIViewController viewDidMoveToWindow:shouldAppearOrDisappear:]_block_invoke.1383 + 44
12 UIKitCore                      0x247562764 -[UIViewController _executeAfterAppearanceBlock] + 88
13 UIKitCore                      0x247b10ef8 _runAfterCACommitDeferredBlocks + 564
14 UIKitCore                      0x247aff93c _cleanUpAfterCAFlushAndRunDeferredBlocks + 352
15 UIKitCore                      0x247b1e5a8 __34-[UIApplication _firstCommitBlock]_block_invoke_2 + 136
16 CoreFoundation                 0x21b29ee68 __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 20
17 CoreFoundation                 0x21b29e76c __CFRunLoopDoBlocks + 272
18 CoreFoundation                 0x21b2997d0 __CFRunLoopRun + 1024
19 CoreFoundation                 0x21b2990b0 CFRunLoopRunSpecific + 436
20 GraphicsServices               0x21d49979c GSEventRunModal + 104
21 UIKitCore                      0x247b05978 UIApplicationMain + 212
22 APP                        0x1044f8504 main (InboxInterests.swift:22)
23 libdyld.dylib                  0x21ad5e8e0 start + 4

Upvotes: 1

Views: 655

Answers (1)

Utku Dalmaz
Utku Dalmaz

Reputation: 10162

I solved this issue by just adding 

if tableView != nil {
        }

It was a very easy fix. But I think iOS should manage it itself in the first place.

Upvotes: 3

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