System/Library/PrivateFrameworks/PreviewsInjection.framework

PreviewsInjection.AppearanceCollector.h

Download PreviewsInjection.AppearanceCollector.h

1. _TtCs12_SwiftObject

@interface PreviewsInjection.AppearanceCollector : _TtCs12_SwiftObject {
    void /* unknown type, empty encoding */ delegate;
}

@end