Question

我们正在UIWebView中使用Select控件（Drop Down）加载HTML，当我们点击Drop down时，应用程序崩溃了。仅当文本具有冗长的文本时才会发生这种情况，但是对于短文本可以正常工作。

当我们调试时，我们发现它来自UIWebView的UIPabover控件中的UILabel问题。当UILabel有2行文字时，这个问题正在发生，单行很好。无论是故事板还是设置等，我们无法确定问题。

非常感谢任何帮助。

这是崩溃

* thread #1: tid = 0x1bd3, 0x034ad930 CoreFoundation`CFArrayGetValueAtIndex + 112, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
frame #0: 0x034ad930 CoreFoundation`CFArrayGetValueAtIndex + 112
frame #1: 0x007d1b41 CoreText`TCharStream::CopyBreakIterator(__CFString const*) + 261
frame #2: 0x007d18f4 CoreText`TCharStream::FindLineBreak(CFRange, bool, __CFString const*) const + 246
frame #3: 0x00758a4a CoreText`TTypesetter::SuggestLineBreak(TLine const&, long, double, double) + 328
frame #4: 0x007586b9 CoreText`CTLineSuggestLineBreakWithOffset + 55
frame #5: 0x0839d89f UIFoundation`__NSStringDrawingEngine + 20275
frame #6: 0x08398940 UIFoundation`-[NSString(NSExtendedStringDrawing) boundingRectWithSize:options:attributes:context:] + 201
frame #7: 0x01b265c1 UIKit`-[UILabel _textRectForBounds:limitedToNumberOfLines:includingShadow:] + 1425
frame #8: 0x01b25e7e UIKit`-[UILabel textRectForBounds:limitedToNumberOfLines:] + 85
frame #9: 0x01d1d0cb UIKit`-[UITableViewCellLayoutManager intrinsicContentSizeForCell:] + 554
frame #10: 0x01c16594 UIKit`-[UITableViewCell sizeThatFits:] + 46
frame #11: 0x02092ade UIKit`-[UIView(UIConstraintBasedLayout) systemLayoutSizeFittingSize:withHorizontalFittingPriority:verticalFittingPriority:] + 130
frame #12: 0x01c01c9f UIKit`-[UITableViewCell systemLayoutSizeFittingSize:withHorizontalFittingPriority:verticalFittingPriority:] + 220
frame #13: 0x01a3f847 UIKit`-[UITableView _heightForCell:atIndexPath:] + 386
frame #14: 0x01a302fb UIKit`__53-[UITableView _configureCellForDisplay:forIndexPath:]_block_invoke + 2244
frame #15: 0x019987af UIKit`+[UIView(Animation) performWithoutAnimation:] + 82
frame #16: 0x019987f8 UIKit`+[UIView(Animation) _performWithoutAnimation:] + 40
frame #17: 0x01a2fa2f UIKit`-[UITableView _configureCellForDisplay:forIndexPath:] + 355
frame #18: 0x01a381da UIKit`-[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 503
frame #19: 0x01a3829e UIKit`-[UITableView _createPreparedCellForGlobalRow:willDisplay:] + 77
frame #20: 0x01a11a6b UIKit`-[UITableView _updateVisibleCellsNow:isRecursive:] + 3034
frame #21: 0x01a2c3d1 UIKit`-[UITableView layoutSubviews] + 222
frame #22: 0x019a1dd1 UIKit`-[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 608
frame #23: 0x02f55771 libobjc.A.dylib`-[NSObject performSelector:withObject:] + 70
frame #24: 0x0061f28f QuartzCore`-[CALayer layoutSublayers] + 152
frame #25: 0x00613115 QuartzCore`CA::Layer::layout_if_needed(CA::Transaction*) + 397
frame #26: 0x00612f70 QuartzCore`CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 26
frame #27: 0x005713c6 QuartzCore`CA::Context::commit_transaction(CA::Transaction*) + 284
frame #28: 0x0057278c QuartzCore`CA::Transaction::commit() + 392
frame #29: 0x00572e58 QuartzCore`CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 92
frame #30: 0x034fa9de CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 30
frame #31: 0x034fa920 CoreFoundation`__CFRunLoopDoObservers + 400
frame #32: 0x034f035a CoreFoundation`__CFRunLoopRun + 1226
frame #33: 0x034efbcb CoreFoundation`CFRunLoopRunSpecific + 443
frame #34: 0x034ef9fb CoreFoundation`CFRunLoopRunInMode + 123
frame #35: 0x04d4224f GraphicsServices`GSEventRunModal + 192
frame #36: 0x04d4208c GraphicsServices`GSEventRun + 104
frame #37: 0x019168b6 UIKit`UIApplicationMain + 1526

*第38帧：0x000f85bd main(argc=1, argv=0xbff5e584) + 141 at main.m:16 frame #39: 0x04400ac9 libdyld.dylib开始+ 1

谢谢，维杰

Answer 1

这是重复的，请参阅我的回答：https://stackoverflow.com/a/26692948/4206060

简而言之，将其放入您的网络视图委托：

-(void)presentViewController:(UIViewController *)viewControllerToPresent animated:(BOOL)flag completion:(void (^)(void))completion
{
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, NSEC_PER_USEC), dispatch_get_main_queue(),
               ^{
                   [super presentViewController:viewControllerToPresent animated:flag completion:completion];
               });
}

Answer 2

这已经解决了。问题是因为硬编码和＃Apple; AppleLanguages＆＃34; NSDefaults字符串的关键字。当UIWebview试图显示UILabel时，它会尝试将AppleLanguages作为数组获取并崩溃。

下拉动UIWebView崩溃

2 个答案: