Pan Gesture causing crashing

[miguellan]

The following informations are requested in a bug report

Accidentally panning up on calendar causing crash.

• Stack trace. see below

• Integration method. pods

• Full steps to reproduce.
  Add calendar with constraints to bottom of 0, and equal width to container, with 0 for leading space to container. Then add the pan gesture as shown in the demo code for Interface builder example. Then swipe up on the calendar...it doesn't happen every time, but I've gotten it to swipe up and then crash pretty consistently.

Xcode 8.1
2.7.3

CALayer position contains NaN: [207 nan]
["0 CoreFoundation 0x000000018bce11d0 + 148", "1 libobjc.A.dylib 0x000000018a71855c objc_exception_throw + 56", "2 CoreFoundation 0x000000018bce1100 + 0", "3 QuartzCore 0x000000018f03919c + 152", "4 QuartzCore 0x000000018f039310 + 40", "5 QuartzCore 0x000000018f0398a8 + 448", "6 UIKit 0x0000000191b90174 + 784", "7 UIKit 0x0000000191bb4440 + 116", "8 UIKit 0x0000000191c45c14 + 472", "9 FSCalendar 0x0000000100f4bf28 -[UIView(FSCalendarExtensions) setFs_top:] + 196", "10 FSCalendar 0x0000000100f5de88 -[FSCalendarTransitionCoordinator performPathAnimationWithProgress:] + 928", "11 FSCalendar 0x0000000100f5684c -[FSCalendarTransitionCoordinator scopeTransitionDidUpdate:] + 1172", "12 FSCalendar 0x0000000100f5553c -[FSCalendarTransitionCoordinator handleScopeGesture:] + 164", "13 FSCalendar 0x0000000100f2ea44 -[FSCalendar handleScopeGesture:] + 112", "14 UIKit 0x000000019215ef80 + 64", "15 UIKit 0x0000000192162688 + 124", "16 UIKit 0x0000000191d2973c + 260", "17 UIKit 0x0000000191bc80f0 + 764", "18 UIKit 0x0000000192152680 + 1100", "19 UIKit 0x00000001921521e0 + 408", "20 UIKit 0x000000019215149c + 268", "21 UIKit 0x0000000191bc630c + 2960", "22 UIKit 0x0000000191b96da0 + 340", "23 UIKit 0x000000019238075c + 2736", "24 UIKit 0x000000019237a130 + 784", "25 CoreFoundation 0x000000018bc8eb5c + 24", "26 CoreFoundation 0x000000018bc8e4a4 + 524", "27 CoreFoundation 0x000000018bc8c0a4 + 804", "28 CoreFoundation 0x000000018bbba2b8 CFRunLoopRunSpecific + 444", "29 GraphicsServices 0x000000018d66e198 GSEventRunModal + 180", "30 UIKit 0x0000000191c017fc + 684", "31 UIKit 0x0000000191bfc534 UIApplicationMain + 208", "32 grow 0x000000010019f80c main + 140", "33 libdyld.dylib 0x000000018ab9d5b8 + 4"]

• Does this happen in the demo project? Which one? Or a link to another demo project.
  Yes, demo for Interface builder

[WenchaoD]

Same as #621
Fixed.