仅在 iPhone 5C 上滚动 UITableView 会导致异常和崩溃

Posted 2023-03-03

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【中文标题】仅在 iPhone 5C 上滚动 UITableView 会导致异常和崩溃【英文标题】：Scrolling through UITableView causes Exception and Crash only on iPhone 5C 【发布时间】：2014-09-09 15:35:40 【问题描述】：

当用户滚动浏览我的UITableView 太快或点击状态栏跳到表格顶部时，会引发异常。我只在 iPhone 5C 设备上看到此崩溃。 4S、5、32位模拟器都无法重现。

使用“所有异常”断点，我能够打印出我可以通过崩溃增加帧指针的所有回溯。因为在回溯中没有我的应用程序的痕迹（除了主要的），我认为这是一个 Apple 错误，与 [NSRLEArray objectAtIndex:effectiveRange:] 有关。 this 问题的作者似乎对 OS X 应用程序也有同样的问题，并且有一条评论建议查看我的应用程序中的 NSAttributedString 用法。我确实在我的表格视图单元格中使用NSAttributedStrings 来超链接UITextView 中的某些字符串。但如果是NSAttributedString 的普遍问题，这不会也导致其他 ios 设备崩溃吗？

回溯：

(lldb) bt
* thread #1: tid = 0x2e57bd, 0x3978e6a0 libobjc.A.dylib`objc_exception_throw, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
    frame #0: 0x3978e6a0 libobjc.A.dylib`objc_exception_throw
    frame #1: 0x2f431dc4 CoreFoundation`+[NSException raise:format:] + 112
    frame #2: 0x2fd55230 Foundation`-[NSRLEArray objectAtIndex:effectiveRange:] + 120
    frame #3: 0x2fd71d76 Foundation`-[NSConcreteMutableAttributedString addAttribute:value:range:] + 198
    frame #4: 0x36d7b278 UIFoundation`__50-[NSConcreteTextStorage addAttribute:value:range:]_block_invoke + 156
    frame #5: 0x36d7b102 UIFoundation`-[NSConcreteTextStorage addAttribute:value:range:] + 170
    frame #6: 0x337fc02e DataDetectorsUI`-[DDTextKitOperation _addResultsToAttributes] + 266
    frame #7: 0x337fc1d6 DataDetectorsUI`__46-[DDTextKitOperation doURLificationOnDocument]_block_invoke_2 + 26
    frame #8: 0x36d79a5e UIFoundation`-[NSTextStorage(ActorSupport) coordinateAccess:] + 34
    frame #9: 0x337fc1b8 DataDetectorsUI`__46-[DDTextKitOperation doURLificationOnDocument]_block_invoke + 116
    frame #10: 0x39c78bde libdispatch.dylib`_dispatch_barrier_sync_f_slow_invoke + 66
    frame #11: 0x39c730ae libdispatch.dylib`_dispatch_client_callout + 22
    frame #12: 0x39c759a8 libdispatch.dylib`_dispatch_main_queue_callback_4CF + 268
    frame #13: 0x2f3fc5b0 CoreFoundation`__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 8
    frame #14: 0x2f3fae7c CoreFoundation`__CFRunLoopRun + 1308
    frame #15: 0x2f365470 CoreFoundation`CFRunLoopRunSpecific + 524
    frame #16: 0x2f365252 CoreFoundation`CFRunLoopRunInMode + 106
    frame #17: 0x3409f2ea GraphicsServices`GSEventRunModal + 138
    frame #18: 0x31c1a844 UIKit`UIApplicationMain + 1136
  * frame #19: 0x000bffb4 [AppName]`main(argc=1, argv=0x27d4ecec) + 116 at main.m:16
(lldb) bt
* thread #1: tid = 0x2e57bd, 0x39153994 libc++abi.dylib`__cxa_throw, queue = 'com.apple.main-thread', stop reason = breakpoint 1.2
    frame #0: 0x39153994 libc++abi.dylib`__cxa_throw
    frame #1: 0x3978e79a libobjc.A.dylib`objc_exception_throw + 250
    frame #2: 0x2f431dc4 CoreFoundation`+[NSException raise:format:] + 112
    frame #3: 0x2fd55230 Foundation`-[NSRLEArray objectAtIndex:effectiveRange:] + 120
    frame #4: 0x2fd71d76 Foundation`-[NSConcreteMutableAttributedString addAttribute:value:range:] + 198
    frame #5: 0x36d7b278 UIFoundation`__50-[NSConcreteTextStorage addAttribute:value:range:]_block_invoke + 156
    frame #6: 0x36d7b102 UIFoundation`-[NSConcreteTextStorage addAttribute:value:range:] + 170
    frame #7: 0x337fc02e DataDetectorsUI`-[DDTextKitOperation _addResultsToAttributes] + 266
    frame #8: 0x337fc1d6 DataDetectorsUI`__46-[DDTextKitOperation doURLificationOnDocument]_block_invoke_2 + 26
    frame #9: 0x36d79a5e UIFoundation`-[NSTextStorage(ActorSupport) coordinateAccess:] + 34
    frame #10: 0x337fc1b8 DataDetectorsUI`__46-[DDTextKitOperation doURLificationOnDocument]_block_invoke + 116
    frame #11: 0x39c78bde libdispatch.dylib`_dispatch_barrier_sync_f_slow_invoke + 66
    frame #12: 0x39c730ae libdispatch.dylib`_dispatch_client_callout + 22
    frame #13: 0x39c759a8 libdispatch.dylib`_dispatch_main_queue_callback_4CF + 268
    frame #14: 0x2f3fc5b0 CoreFoundation`__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 8
    frame #15: 0x2f3fae7c CoreFoundation`__CFRunLoopRun + 1308
    frame #16: 0x2f365470 CoreFoundation`CFRunLoopRunSpecific + 524
    frame #17: 0x2f365252 CoreFoundation`CFRunLoopRunInMode + 106
    frame #18: 0x3409f2ea GraphicsServices`GSEventRunModal + 138
    frame #19: 0x31c1a844 UIKit`UIApplicationMain + 1136
  * frame #20: 0x000bffb4 [AppName]`main(argc=1, argv=0x27d4ecec) + 116 at main.m:16
(lldb) bt
* thread #1: tid = 0x2e57bd, 0x3978e6a0 libobjc.A.dylib`objc_exception_throw, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
    frame #0: 0x3978e6a0 libobjc.A.dylib`objc_exception_throw
    frame #1: 0x2f431b88 CoreFoundation`-[NSException raise] + 8
    frame #2: 0x36d7b19a UIFoundation`-[NSConcreteTextStorage addAttribute:value:range:] + 322
    frame #3: 0x337fc02e DataDetectorsUI`-[DDTextKitOperation _addResultsToAttributes] + 266
    frame #4: 0x337fc1d6 DataDetectorsUI`__46-[DDTextKitOperation doURLificationOnDocument]_block_invoke_2 + 26
    frame #5: 0x36d79a5e UIFoundation`-[NSTextStorage(ActorSupport) coordinateAccess:] + 34
    frame #6: 0x337fc1b8 DataDetectorsUI`__46-[DDTextKitOperation doURLificationOnDocument]_block_invoke + 116
    frame #7: 0x39c78bde libdispatch.dylib`_dispatch_barrier_sync_f_slow_invoke + 66
    frame #8: 0x39c730ae libdispatch.dylib`_dispatch_client_callout + 22
    frame #9: 0x39c759a8 libdispatch.dylib`_dispatch_main_queue_callback_4CF + 268
    frame #10: 0x2f3fc5b0 CoreFoundation`__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 8
    frame #11: 0x2f3fae7c CoreFoundation`__CFRunLoopRun + 1308
    frame #12: 0x2f365470 CoreFoundation`CFRunLoopRunSpecific + 524
    frame #13: 0x2f365252 CoreFoundation`CFRunLoopRunInMode + 106
    frame #14: 0x3409f2ea GraphicsServices`GSEventRunModal + 138
    frame #15: 0x31c1a844 UIKit`UIApplicationMain + 1136
  * frame #16: 0x000bffb4 [AppName]`main(argc=1, argv=0x27d4ecec) + 116 at main.m:16
(lldb) bt
* thread #1: tid = 0x2e57bd, 0x39153994 libc++abi.dylib`__cxa_throw, queue = 'com.apple.main-thread', stop reason = breakpoint 1.2
    frame #0: 0x39153994 libc++abi.dylib`__cxa_throw
    frame #1: 0x3978e79a libobjc.A.dylib`objc_exception_throw + 250
    frame #2: 0x2f431b88 CoreFoundation`-[NSException raise] + 8
    frame #3: 0x36d7b19a UIFoundation`-[NSConcreteTextStorage addAttribute:value:range:] + 322
    frame #4: 0x337fc02e DataDetectorsUI`-[DDTextKitOperation _addResultsToAttributes] + 266
    frame #5: 0x337fc1d6 DataDetectorsUI`__46-[DDTextKitOperation doURLificationOnDocument]_block_invoke_2 + 26
    frame #6: 0x36d79a5e UIFoundation`-[NSTextStorage(ActorSupport) coordinateAccess:] + 34
    frame #7: 0x337fc1b8 DataDetectorsUI`__46-[DDTextKitOperation doURLificationOnDocument]_block_invoke + 116
    frame #8: 0x39c78bde libdispatch.dylib`_dispatch_barrier_sync_f_slow_invoke + 66
    frame #9: 0x39c730ae libdispatch.dylib`_dispatch_client_callout + 22
    frame #10: 0x39c759a8 libdispatch.dylib`_dispatch_main_queue_callback_4CF + 268
    frame #11: 0x2f3fc5b0 CoreFoundation`__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 8
    frame #12: 0x2f3fae7c CoreFoundation`__CFRunLoopRun + 1308
    frame #13: 0x2f365470 CoreFoundation`CFRunLoopRunSpecific + 524
    frame #14: 0x2f365252 CoreFoundation`CFRunLoopRunInMode + 106
    frame #15: 0x3409f2ea GraphicsServices`GSEventRunModal + 138
    frame #16: 0x31c1a844 UIKit`UIApplicationMain + 1136
  * frame #17: 0x000bffb4 [AppName]`main(argc=1, argv=0x27d4ecec) + 116 at main.m:16
(lldb) bt
* thread #1: tid = 0x2e57bd, 0x39d3e1fc libsystem_kernel.dylib`__pthread_kill + 8, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
    frame #0: 0x39d3e1fc libsystem_kernel.dylib`__pthread_kill + 8
    frame #1: 0x39da5a52 libsystem_pthread.dylib`pthread_kill + 58
    frame #2: 0x39cef02c libsystem_c.dylib`abort + 76
    frame #3: 0x001f32ba [AppName]`uncaught_exception_handler + 26
    frame #4: 0x2f432184 CoreFoundation`__handleUncaughtException + 580
    frame #5: 0x3978e926 libobjc.A.dylib`_objc_terminate() + 174
    frame #6: 0x391541b2 libc++abi.dylib`std::__terminate(void (*)()) + 78
    frame #7: 0x39153d16 libc++abi.dylib`__cxa_rethrow + 102
    frame #8: 0x3978e80e libobjc.A.dylib`objc_exception_rethrow + 42
    frame #9: 0x36d7b150 UIFoundation`-[NSConcreteTextStorage addAttribute:value:range:] + 248
    frame #10: 0x337fc02e DataDetectorsUI`-[DDTextKitOperation _addResultsToAttributes] + 266
    frame #11: 0x337fc1d6 DataDetectorsUI`__46-[DDTextKitOperation doURLificationOnDocument]_block_invoke_2 + 26
    frame #12: 0x36d79a5e UIFoundation`-[NSTextStorage(ActorSupport) coordinateAccess:] + 34
    frame #13: 0x337fc1b8 DataDetectorsUI`__46-[DDTextKitOperation doURLificationOnDocument]_block_invoke + 116
    frame #14: 0x39c78bde libdispatch.dylib`_dispatch_barrier_sync_f_slow_invoke + 66
    frame #15: 0x39c730ae libdispatch.dylib`_dispatch_client_callout + 22
    frame #16: 0x39c759a8 libdispatch.dylib`_dispatch_main_queue_callback_4CF + 268
    frame #17: 0x2f3fc5b0 CoreFoundation`__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 8
    frame #18: 0x2f3fae7c CoreFoundation`__CFRunLoopRun + 1308
    frame #19: 0x2f365470 CoreFoundation`CFRunLoopRunSpecific + 524
    frame #20: 0x2f365252 CoreFoundation`CFRunLoopRunInMode + 106
    frame #21: 0x3409f2ea GraphicsServices`GSEventRunModal + 138
    frame #22: 0x31c1a844 UIKit`UIApplicationMain + 1136
  * frame #23: 0x000bffb4 [AppName]`main(argc=1, argv=0x27d4ecec) + 116 at main.m:16
(lldb) bt
* thread #22: tid = 0x2e57ea, 0x39da2cbc libsystem_pthread.dylib`start_wqthread, stop reason = signal SIGABRT
  * frame #0: 0x39da2cbc libsystem_pthread.dylib`start_wqthread

这里是我设置属性字符串的地方：

// earlier in the code
tweetTextView.attributedText = [[NSAttributedString alloc] initWithString:tweetTextView.text];
...

-(void)findHashtagsAndAtMentionsInTweetText:(UITextView *)textView 

    NSString *tweetText = textView.text;

    NSError *error = nil;
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"(@(\\w+))|(^|\\W)(#|\\uFF03)(\\w*\\pL\\w*)" options:0 error:&error];
    NSArray *matches = [regex matchesInString:tweetText options:0 range:NSMakeRange(0, tweetText.length)];

    NSMutableAttributedString * myTagOrMention = [[NSMutableAttributedString alloc] initWithString:tweetTextView.text];

    for (NSTextCheckingResult *match in matches) 

        NSRange wordRange = [match rangeAtIndex:0]; // causing crash?
        NSString* word = [tweetText substringWithRange:wordRange];

        if([word rangeOfString:@"@"].location != NSNotFound) 

            // @ mention

            // remove whitespaces and @
            NSString *formattedTag = [NSString stringWithFormat:@"%@", [[word stringByReplacingOccurrencesOfString:@" " withString:@""] stringByReplacingOccurrencesOfString:@"@" withString:@""]];

            NSString *tweetContets = tweetTextView.text;
            NSRange range = [tweetContets rangeOfString:word];

            if([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"twitter://"]]) 
                NSString *twitterAppURL = [NSString stringWithFormat:@"%@%@", @"twitter://user?screen_name=",formattedTag];
                [myTagOrMention addAttribute:NSLinkAttributeName value:twitterAppURL range:range];
             else 

                [myTagOrMention addAttribute:NSLinkAttributeName value:[NSString stringWithFormat:@"%@%@", @"http://mobile.twitter.com/",formattedTag] range:range];
            

            tweetTextView.attributedText = myTagOrMention;

         else 
            // hashtag

            // remove whitespaces and pound
            NSString *formattedTag = [NSString stringWithFormat:@"%@", [[word stringByReplacingOccurrencesOfString:@" " withString:@""] stringByReplacingOccurrencesOfString:@"#" withString:@""]];

            NSString *tweetContets = tweetTextView.text;
            NSRange range = [tweetContets rangeOfString:word];

            [myTagOrMention addAttribute:NSLinkAttributeName value:[NSString stringWithFormat:@"%@%@%@%@", @"http://twitter.com/search/", @"?q=%23", formattedTag, @"&s=hash"] range:range];

            tweetTextView.attributedText = myTagOrMention;

【问题讨论】：

我相信这个问题有可取之处，应该重新打开。我有另一个用户尝试在此处就有关此问题的其他问题与我联系：***.com/questions/24620330/… 要重新打开它，您应该：包含重现此崩溃所需的最少代码量；将问题从“对这个令人费解的崩溃的任何帮助都会非常感激”改进为重申您的实际问题的问题。 @GeorgeStocker 谢谢你，抱歉耽搁了。这是一个我不再参与的旧项目，不得不挖掘代码和 QA 设备。我已编辑问题以反映发生问题的代码块。 【参考方案1】：

错误不在您发布的代码中。该错误发生在 UITextView 在其链接仍在生成时被重用，这是异步完成的。

查看这些类似的 Stack Overflow 问题：

iOS 7 UITextView link detection crash in UITableView UITextViews in a UITableView link detection bug in iOS 7 UITextView link detection in iOS 7

许多用户报告说，在单元格的 prepareForReuse 方法中将文本视图的文本属性设置为 nil 可以解决此问题。或者，您可以使用 TTTAttributedLabel 之类的库来代替文本视图。

它只出现在 iPhone 5C 上的事实可能是red herring。我敢打赌这台设备仍在运行 iOS 7，而其他设备已更新到更新的 iOS 版本。

附带说明，您的正则表达式可能未涵盖某些极端情况。我会删除你的推特解析方法并用the official twitter-text-objc library替换它。

【讨论】：

这是一个很好的答案，非常感谢您抽出宝贵时间回答这个问题。当时所有设备都运行 iOS 7（这是在 iOS 8 发布之前），我无法在运行 iOS 8.1 的 5C 设备上重现崩溃。这是我们正在迁移到 iOS 7 SDK 的一个非常古老的项目，我怀疑我是否会继续研究它。我将暂时将此答案标记为已接受，实施更改，并在我有任何其他问题时发表评论。再次感谢。 @JAL 在 prepareForReuse 中将 text 设置为 nil 是否解决了问题？

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