System/Library/PrivateFrameworks/SpringBoardHome.framework

SBGrabbedPlaceholderIcon.h

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1. NSObject
2. >
3. SBIcon
4. >
5. SBPlaceholderIcon

@interface SBGrabbedPlaceholderIcon : SBPlaceholderIcon

- (BOOL)isGrabbedIconPlaceholder;

@end