Terminating app due to uncaught exception 'CALayerInvalidGeometry', reason: 'CALayer position contains NaN: [nan 40]
栈信息打印如下：
2015-10-20 10:01:12.871 Putaoji[49129:1691777] *** Terminating app due to uncaught exception 'CALayerInvalidGeometry', reason: 'CALayer position contains NaN: [nan 40]'
*** First throw call stack:
(
0 CoreFoundation 0x000000010df49f65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010d244deb objc_exception_throw + 48
2 CoreFoundation 0x000000010df49e9d +[NSException raise:format:] + 205
3 QuartzCore 0x000000010cc2f7e6 _ZN2CA5Layer12set_positionERKNS_4Vec2IdEEb + 152
4 QuartzCore 0x000000010cc2f959 -[CALayer setPosition:] + 44
5 QuartzCore 0x000000010cc2ffbd -[CALayer setFrame:] + 650
6 UIKit 0x000000010e9673f7 -[UIView(Geometry) setFrame:] + 356
7 UIKit 0x000000010ec50422 -[UIButton _setFrame:deferLayout:] + 125
8 UIKit 0x000000010ec50522 -[UIButton setFrame:] + 178
9 Putaoji 0x000000010ae41132 -[PTJInviteFriendsViewController createShareButtonWithFrame:atIndex:title:imageName:] + 690
10 Putaoji 0x000000010ae4004b -[PTJInviteFriendsViewController setupUI] + 2715
11 Putaoji 0x000000010ae3f5a4 -[PTJInviteFriendsViewController viewDidLoad] + 228
12 UIKit 0x000000010ea59931 -[UIViewController loadViewIfRequired] + 1344
13 UIKit 0x000000010ea5f923 -[UIViewController __viewWillAppear:] + 120
14 UIKit 0x000000010ea8f18a -[UINavigationController _startCustomTransition:] + 1177
15 UIKit 0x000000010ea9e7c7 -[UINavigationController _startDeferredTransitionIfNeeded:] + 712
16 UIKit 0x000000010ea9f67d -[UINavigationController __viewWillLayoutSubviews] + 57
17 UIKit 0x000000010ec3763d -[UILayoutContainerView layoutSubviews] + 248
18 UIKit 0x000000010e97f11c -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 710
19 QuartzCore 0x000000010cc3836a -[CALayer layoutSublayers] + 146
20 QuartzCore 0x000000010cc2cbd0 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366
21 QuartzCore 0x000000010cc2ca4e _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
22 QuartzCore 0x000000010cc211d5 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 277
23 QuartzCore 0x000000010cc4e9f0 _ZN2CA11Transaction6commitEv + 508
24 UIKit 0x000000010e8f853a _afterCACommitHandler + 174
25 CoreFoundation 0x000000010de759d7 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
26 CoreFoundation 0x000000010de75947 __CFRunLoopDoObservers + 391
27 CoreFoundation 0x000000010de6b59b __CFRunLoopRun + 1147
28 CoreFoundation 0x000000010de6ae98 CFRunLoopRunSpecific + 488
29 GraphicsServices 0x0000000112b04ad2 GSEventRunModal + 161
30 UIKit 0x000000010e8ce676 UIApplicationMain + 171
31 Putaoji 0x000000010af306ff main + 111
32 libdyld.dylib 0x000000010fe9d92d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
解决方法：
意思是说程序崩溃是CALayer的位置中含有不存在的数,说白了就是你的View.frame 中计算的时候，有的地方除以0了。