Question

在解除分配DetailViewController时，无法在iOS 11设备上复制崩溃。

该应用的DetailViewController继承自BaseViewController。 DetailViewController具有DetailViewModel属性。

DetailViewController，BaseViewController和DetailViewModel都是用Objective-C编写的。我将Swift版本升级到Swift 4并向DetailViewModel添加了Swift扩展。

@objc extension DetailViewModel {
        func foo() {
            let conclusionBlock: (() -> Void) = { [weak self] in
                guard let strongSelf = self else { return }
                strongSelf.viewController.reloadData()
            }
            let viewModel = OtherViewModel(conclusionBlock: conclusionBlock)
            let otherViewController = OtherViewController.make(viewModel: viewModel)

            let nav = UINavigationController(rootViewController: otherViewController)
            nav.modalPresentationStyle = .fullScreen

            viewController.present(nav, animated: true, completion: nil)
        }
    }

查看日志，func foo() swift扩展程序中的DetailViewModel未被调用，并且仍然在dealloc上崩溃。

有没有人知道问题是什么或如何解决？

谢谢

堆栈跟踪：

Crashed: com.apple.main-thread
0  libobjc.A.dylib                0x18589d7f4 objc_object::release() + 16
1  CoreFoundation                 0x1862f3108 cow_cleanup + 112
2  CoreFoundation                 0x18623a51c -[__NSArrayM dealloc] + 68
3  libobjc.A.dylib                0x18587eef4 object_cxxDestructFromClass(objc_object*, objc_class*) + 148
4  libobjc.A.dylib                0x18588c638 objc_destructInstance + 88
5  libobjc.A.dylib                0x18588c690 object_dispose + 16
6  AppName                        0x100c7dbec -[DetailViewModel .cxx_destruct] (DetailViewModel.m:43)
7  libobjc.A.dylib                0x18587eef4 object_cxxDestructFromClass(objc_object*, objc_class*) + 148
8  libobjc.A.dylib                0x18588c638 objc_destructInstance + 88
9  libobjc.A.dylib                0x18588c690 object_dispose + 16
10 AppName                        0x100cbe358 -[DetailViewController .cxx_destruct] (DetailViewController.m:103)
11 libobjc.A.dylib                0x18587eef4 object_cxxDestructFromClass(objc_object*, objc_class*) + 148
12 libobjc.A.dylib                0x18588c638 objc_destructInstance + 88
13 libobjc.A.dylib                0x18588c690 object_dispose + 16
14 UIKit                          0x18fb338f4 -[UIResponder dealloc] + 156
15 UIKit                          0x18f8e9e7c -[UIViewController dealloc] + 1776
16 AppName                        0x100c9b66c -[BaseViewController dealloc] (BaseViewController.m:56)
17 AppName                        0x100cb6570 -[DetailViewController dealloc] (DetailViewController.m:261)
18 UIKit                          0x18f9d3ec4 __destroy_helper_block_.150 + 80
19 libsystem_blocks.dylib         0x185d91a60 _Block_release + 160
20 UIKit                          0x18fa5f5bc -[UIViewAnimationBlockDelegate .cxx_destruct] + 72
21 libobjc.A.dylib                0x18587eef4 object_cxxDestructFromClass(objc_object*, objc_class*) + 148
22 libobjc.A.dylib                0x18588c638 objc_destructInstance + 88
23 libobjc.A.dylib                0x18588c690 object_dispose + 16
24 CoreFoundation                 0x18623d998 -[__NSDictionaryI dealloc] + 136
25 libobjc.A.dylib                0x18589e138 (anonymous namespace)::AutoreleasePoolPage::pop(void*) + 836
26 CoreFoundation                 0x186232050 _CFAutoreleasePoolPop + 28
27 CoreFoundation                 0x186311b04 __CFRunLoopRun + 2020
28 CoreFoundation                 0x1862322d8 CFRunLoopRunSpecific + 436
29 GraphicsServices               0x1880c3f84 GSEventRunModal + 100
30 UIKit                          0x18f7df880 UIApplicationMain + 208
31 AppName                        0x100d59540 main (main.m:10)
32 libdyld.dylib                  0x185d5656c start + 4

Answer 1

要帮助复制此问题，请尝试在Xcode 9中启用Address Sanitizer。

Answer 2

当对象被销毁并释放其数组时，您有一个存储在数组中的对象被过度释放。

您可以先激活zombie objects（在播放按钮附近显示您的目标，然后选择scheme/Run/Diagnostics/Zombie objects）。在这种模式下，对象并未真正释放，因此您可以查询导致崩溃的对象以查看其类型并开始跟踪它。

dealloc上的iOS 11 EXC_BAD_ACCESS KERN_INVALID_ADDRESS

2 个答案: