With Xcode 9.2 I got an error while loading some images from app bundle.
With Xcode 9.1 all works well.
[_CUIThemePixelRendition _initWithCSIHeader:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/CoreUI_Sim/CoreUI-432.4/CoreTheme/ThemeStorage/CUIThemeRendition.m:3797
2017-12-11 18:03:37.897 aton[17733:191573] *** Assertion failure in -[_CUIThemePixelRendition _initWithCSIHeader:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/CoreUI_Sim/CoreUI-432.4/CoreTheme/ThemeStorage/CUIThemeRendition.m:3797
2017-12-11 18:03:37.898 aton[17733:191573] *** Assertion failure in -[_CUIThemePixelRendition _initWithCSIHeader:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/CoreUI_Sim/CoreUI-432.4/CoreTheme/ThemeStorage/CUIThemeRendition.m:3797
2017-12-11 18:03:37.901 aton[17733:191573] Could not load the "showcase_bg" image referenced from a nib in the bundle with identifier "ru.aton.finance"
2017-12-11 18:03:37.909 aton[17733:191573] *** Assertion failure in -[_CUIThemePixelRendition _initWithCSIHeader:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/CoreUI_Sim/CoreUI-432.4/CoreTheme/ThemeStorage/CUIThemeRendition.m:3797
2017-12-11 18:03:37.910 aton[17733:191573] *** Assertion failure in -[_CUIThemePixelRendition _initWithCSIHeader:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/CoreUI_Sim/CoreUI-432.4/CoreTheme/ThemeStorage/CUIThemeRendition.m:3797
2017-12-11 18:03:37.910 aton[17733:191573] *** Assertion failure in -[_CUIThemePixelRendition _initWithCSIHeader:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/CoreUI_Sim/CoreUI-432.4/CoreTheme/ThemeStorage/CUIThemeRendition.m:3797
Fatal error: Unexpectedly found nil while unwrapping an Optional value