System/Library/PrivateFrameworks/SpringBoardHome.framework

SBIconListFlowExtendedLayout.h

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1. NSObject
2. >
3. SBIconListGridLayout
4. >
5. SBIconListFlowLayout

@interface SBIconListFlowExtendedLayout : SBIconListFlowLayout

- (struct CGSize { double x0; double x1; })iconSpacingForOrientation:(long long)a0;

@end