bool _WebTryThreadLock(bool), 0xf0d4e50:

最新推荐文章于 2021-10-07 22:10:08 发布

原创最新推荐文章于 2021-10-07 22:10:08 发布 · 3.3k 阅读

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#bool _WebTryThreadLo #崩溃 #ios #线程中更新UI

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本文详细解析了一次Swift编程中在非主线程更新UI导致程序崩溃的问题，通过崩溃日志分析，揭示了问题所在，并解释了错误原因。文章最后指出错误发生在尝试在次要线程获取web锁时，以及对搜索代理方法的误用导致的崩溃。

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崩溃信息打印：

2014-01-17 17:36:47.932 BuyBuyring[32900:9413] bool _WebTryThreadLock(bool), 0xf0d4e50: Tried to obtain the web lock from a thread other than the main thread or the web thread. This may be a result of calling to UIKit from a secondary thread. Crashing now...
1   _ZL17_WebTryThreadLockb
2   WebThreadLock
3   -[UITextRangeImpl isEmpty]
4   -[UITextRange(UITextSelectionAdditions) _isCaret]
5   -[UITextSelectionView setCaretBlinks:]
6   -[UIKeyboardImpl setCaretBlinks:]
7   -[UIKeyboardImpl setDelegate:force:]
8   -[UIPeripheralHost(UIKitInternal) _reloadInputViewsForResponder:]
9   -[UINavigationController navigationTransitionView:didStartTransition:]
10 -[UINavigationTransitionView transition:fromView:toView:]
11 -[UINavigationTransitionView transition:toView:]
12 -[UINavigationController _startTransition:fromViewController:toViewController:]
13 -[UINavigationController _startDeferredTransitionIfNeeded]
14 -[UINavigationController pushViewController:transition:forceImmediate:]
15 -[UINavigationController pushViewController:animated:]
2014-01-17 17:36:48.114 BuyBuyring[32900:707] (
        {
        merchant =         (
        );
        product = "<ProductItem: 0xf028d30>";
    }
)
16 -[RootViewController searchDelegateMetod:]
17 -[NSThread main]
18 __NSThread__main__
19 _pthread_start
20 thread_start
(lldb)

刚开始不知道这是什么原因，百度了一下，说是在线程中更新了UI界面，崩溃在这里（下图）：

然后在调用searchdelegate的方法那里发现自己写错了（粗心啊），本来想要写下面的第一段代码，竟写成了第二段代码：

[self.delegate performSelector:@selector(searchDelegateMetod:) withObject:[dataarray objectAtIndex:indexPath.row]];

[self.delegate performSelectorInBackground:@selector(searchDelegateMetod:) withObject:[dataarray objectAtIndex:indexPath.row]];

所以就出现上面的错误了，呵呵