Call operator for objc.ObjCBlock<UIImage? Function(ffi.Pointer<ffi.Void>)>.
objc.ObjCBlock<UIImage? Function(ffi.Pointer<ffi.Void>)>
Available on ObjCBlock<UIImage? Function(Pointer<Void>)>, provided by the ObjCBlock_UIImage_ffiVoid_CallExtension extension