崩了

*** Terminating app due to uncaught exception 'CALayerInvalidGeometry', reason: 'CALayer position contains NaN: [nan 32]'

*** First throw call stack:

(

0  CoreFoundation                      0x0259ea14 __exceptionPreprocess + 180

1  libobjc.A.dylib                    0x0205fe02 objc_exception_throw + 50

2  CoreFoundation