Terminating app due to uncaught exception ‘CALayerInvalidGeometry‘, reason: ‘CALayer position contains NaN: [nan 660.5]‘
//调用栈
0 CoreFoundation__exceptionPreprocess + 162
1 libobjc.A.dylibobjc_exception_throw + 30
2 CoreFoundation-[NSException initWithCoder:]
3 QuartzCore
CA::Layer::set_position(CA::Vec2<double> const&, bool) + 210
4 QuartzCore
-[CALayer setPosition:] + 50
5 QuartzCore
-[CALayer setFrame:] + 538
6 UIKit
-[UIView(Geometry) setFrame:] + 232
7 UIKit
-[UIWebDocumentView setFrame:] + 132
8 UIKit
-[UIWebBrowserView setFrame:] + 120
9 UIKit
-[UIWebDocumentView _resetForNewPage] + 196
10 UIKit
-[UIWebDocumentView layoutSubviews] + 76
11 UIKit
-[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 258
12 QuartzCore
-[CALayer layoutSublayers] + 214
13 QuartzCore
CA::Layer::layout_if_needed(CA::Transaction*) + 460
14 QuartzCore
CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 16
15 QuartzCore
CA::Context::commit_transaction(CA::Transaction*) + 238
16 QuartzCore
CA::Transaction::commit() + 316
17 QuartzCore
CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 60
结果是算webview 高度时候 初始值为0 导致的，唉 给个webviewHeighe = 1;
就OK了，奇了怪了，ios7没问题， ios6就崩溃！
记下来希望能帮助有这类问题的朋友们~
Terminating app due to uncaught exception 'CALayerInvalidGeometry', reason: 'CALayer position contai