当用户在我的UITableView中滚动过快或点击状态栏跳到表的顶部时，会引发异常。我只在iPhone 5C设备上看到了这次崩溃。我无法在4S、5或32位模拟器上复制它。
使用"All Exceptions"断点，我可以打印出所有可以在崩溃期间递增帧指针的回溯。因为在backtrace中没有我的应用程序的踪迹（除了main之外），我认为这是一个苹果错误，与[NSRLEArray objectAtIndex:effectiveRange:]有关。这个问题的作者似乎对OS X应用程序也有同样的问题，一条评论建议查看我的应用程序中NSAttributedString的使用情况。我确实在表视图单元格中使用NSAttributedStrings来超链接UITextView中的某些字符串。但如果这是NSAttributedString的一个普遍问题，这不会也会导致其他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位置：
// 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*\p{L}\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;
}
}
错误不在您发布的代码中。当UITextView在其链接仍在生成时被重用时，该错误就会发生，这是异步完成的。
请参阅以下类似的堆栈溢出问题：
- iOS 7 UITableView中的UITextView链接检测崩溃
- iOS 7中UITableView链接检测错误中的UITextViews
- iOS 7中的UITextView链接检测
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，您可以使用类似TTTAttributedLabel的库来代替文本视图。
事实上，它只出现在iPhone 5C上可能是转移注意力。我敢打赌，这款设备仍在运行iOS 7，其他设备已更新到新版本的iOS。
附带说明一下，可能存在regex没有涵盖的边缘情况。我会删除你的twitter解析方法，并将其替换为官方的twitter-text-objc库。