Sigh. Contentview size is zero

[NikKovIos]

Check this thread in SO please
https://stackoverflow.com/questions/48018095/xcode-9-1-and-ios-11-causing-crash

I posted the solution there:
Two lines must be in viewWillLayoutSubviews instead of setup method.

self.enableShadow = YES;
self.enableSwipeGesture = YES;