System/Library/PrivateFrameworks/MobileSafariUI.framework

ToggleReaderActivity.h

NSObject
>
UIActivity
>
_SFActivity
>
TabDocumentActivity

@interface ToggleReaderActivity : TabDocumentActivity

- (id)activityType;
- (long long)actionType;
- (id)activityTitle;
- (BOOL)_isEnabled;
- (id)_systemImageName;
- (BOOL)_isDisabled;
- (void)performActivityWithTabDocument:(id)a0;

@end