Wei*_*ann 5 keyboard webview ios ios9
当我从嵌入在webview中的文本视图启动第三方键盘时,它有时会导致应用程序崩溃.
在应用程序崩溃时可以找到一些证据:
""9月25日16:44:09 iPhone6-golden XXX [2916]:此应用程序正在从后台线程修改autolayout引擎,这可能导致引擎损坏和奇怪的崩溃.这将在将来的版本中导致异常.""
Stack:(
0 CoreFoundation 0x00000001836f4f74 <redacted> + 148
1 libobjc.A.dylib 0x00000001982e7f80 objc_exception_throw + 56
2 CoreFoundation 0x00000001836f4ea4 <redacted> + 0
3 Foundation 0x000000018470e5d8 <redacted> + 88
4 Foundation 0x0000000184594f3c <redacted> + 56
5 Foundation 0x0000000184590afc <redacted> + 260
6 UIKit 0x0000000188d4f958 <redacted> + 64
7 UIKit 0x0000000188d50470 <redacted> + 244
8 UIKit 0x0000000188d6cf44 <redacted> + 108
9 UIKit 0x0000000189476798 <redacted> + 268
10 UIKit 0x0000000188f4dfcc <redacted> + 176
11 UIKit 0x0000000188f3d0b4 <redacted> + 52
12 UIKit 0x0000000188c4700c <redacted> + 644
13 QuartzCore 0x000000018844df14 <redacted> + 148
14 QuartzCore 0x0000000188448b20 <redacted> + 292
15 QuartzCore 0x00000001884489e0 <redacted> + 32
16 QuartzCore 0x000000018844807c <redacted> + 252
17 QuartzCore 0x0000000188447dd0 <redacted> + 516
18 QuartzCore 0x0000000188476f48 <redacted> + 236
19 libsystem_pthread.dylib 0x0000000198cf61e8 <redacted> + 584
20 libsystem_pthread.dylib 0x0000000198cf5d60 <redacted> + 136
21 libsystem_pthread.dylib 0x0000000198cf7b48 pthread_sigmask + 0
22 libsystem_pthread.dylib 0x0000000198cf7aa0 <redacted> + 0
23 libsystem_pthread.dylib 0x0000000198cf5030 thread_start + 4
)
这是应用程序崩溃,而不是键盘.您可以在Xcode的设备日志中找到回溯.
异常类型:EXC_CRASH(SIGABRT)异常代码:0x0000000000000000,0x0000000000000000异常注意:由线程触发的EXC_CORPSE_NOTIFY:18已过滤的syslog:未找到
Last Exception Backtrace:
0 CoreFoundation 0x183f20f5c __exceptionPreprocess + 124
1 libobjc.A.dylib 0x198b13f80 objc_exception_throw + 56
2 CoreFoundation 0x183f20e2c +[NSException raise:format:arguments:] + 108
3 Foundation 0x184e0ff3c -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 112
4 UIKit 0x1897130e8 -[UIApplication _cachedSystemAnimationFenceCreatingIfNecessary:] + 200
5 UIKit 0x1897131ac -[UIApplication _systemAnimationFenceCreatingIfNecessary:] + 24
6 UIKit 0x1897653cc +[UIWindow _synchronizedDrawingFence] + 116
7 UIKit 0x189c137a4 -[_UIRemoteViewController synchronizeAnimationsInActions:] + 124
8 UIKit 0x189c0e158 -[_UISizeTrackingView _geometryChanges:forAncestor:] + 540
9 UIKit 0x189775fc8 -[UIView _notifyGeometryObserversWithChangeInfo:] + 272
10 UIKit 0x1894d36b4 -[UIView setCenter:] + 408
11 UIKit 0x18957ea40 -[UIView(Geometry) _applyISEngineLayoutValues] + 600
12 UIKit 0x18948e6b8 -[UIView(Geometry) _resizeWithOldSuperviewSize:] + 136
13 CoreFoundation 0x183e17ab0 __53-[__NSArrayM enumerateObjectsWithOptions:usingBlock:]_block_invoke + 132
14 CoreFoundation 0x183e179a8 -[__NSArrayM enumerateObjectsWithOptions:usingBlock:] + 308
15 UIKit 0x18947d3e8 -[UIView(Geometry) resizeSubviewsWithOldSize:] + 116
16 UIKit 0x18957eb88 -[UIView(AdditionalLayoutSupport) _is_layout] + 128
17 UIKit 0x18977a210 -[UIView(Hierarchy) _updateConstraintsAsNecessaryAndApplyLayoutFromEngine] + 756
18 UIKit 0x18947300c -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 644
19 QuartzCore 0x188c79f14 -[CALayer layoutSublayers] + 148
20 QuartzCore 0x188c74b20 CA::Layer::layout_if_needed(CA::Transaction*) + 292
21 QuartzCore 0x188c749e0 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 32
22 QuartzCore 0x188c7407c CA::Context::commit_transaction(CA::Transaction*) + 252
23 QuartzCore 0x188c73dd0 CA::Transaction::commit() + 516
24 QuartzCore 0x188c6d4bc CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 80
25 CoreFoundation 0x183ed7c30 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32
26 CoreFoundation 0x183ed59d4 __CFRunLoopDoObservers + 372
27 CoreFoundation 0x183e04de0 CFRunLoopRunSpecific + 416
28 WebCore 0x195a69aa0 RunWebThread(void*) + 456
29 libsystem_pthread.dylib 0x199523b3c _pthread_body + 156
30 libsystem_pthread.dylib 0x199523aa0 _pthread_start + 156
31 libsystem_pthread.dylib 0x199521030 thread_start + 4
Thread 18 name: WebThread
Thread 18 Crashed:
0 libsystem_kernel.dylib 0x000000019945b1e0 __pthread_kill + 8
1 libsystem_pthread.dylib 0x0000000199524f0c pthread_kill + 112
2 libsystem_c.dylib 0x00000001993ceb78 abort + 140
3 libc++abi.dylib 0x00000001981913f4 __cxa_bad_cast + 0
4 libc++abi.dylib 0x00000001981aaf60 std::__terminate(void (*)()) + 44
5 libc++abi.dylib 0x00000001981aab10 __cxa_rethrow + 144
6 libobjc.A.dylib 0x0000000198b14120 objc_exception_rethrow + 44
7 CoreFoundation 0x0000000183e04e68 CFRunLoopRunSpecific + 552
8 WebCore 0x0000000195a69aa0 RunWebThread(void*) + 456
9 libsystem_pthread.dylib 0x0000000199523b3c _pthread_body + 156
10 libsystem_pthread.dylib 0x0000000199523aa0 _pthread_body + 0
11 libsystem_pthread.dylib 0x0000000199521030 thread_start + 4
从崩溃堆栈中可以看出,应用程序是从WebThread崩溃的,我猜它是在显示键盘时更新一些UI细节.
但是,ios8中的一切都运行良好.*.谁能给我一些关于为什么会这样的建议呢？或者为什么webview与iOS8如此奇怪和不同？我找不到苹果公司文件的任何变化.
提前致谢.
我发现崩溃问题可能是由3方键盘的启动时间成本引起的。
我做了以下实验来比较自定义键盘的快速启动和延迟启动时间成本。这两个实验中唯一的一个变量是启动键盘时间成本。没有任何延迟的键盘看起来很稳定（我的意思是我没有发现任何崩溃），但是当我延迟键盘大约800ms-1ms时，崩溃的风险迅速增加。
所以我想知道WebThread可能有一些计时器，当你的键盘出现时（这意味着自动布局引擎需要工作），它可能会触发webview崩溃。
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