minimumInteritemSpacing
The minimum spacing (in points) to use between items in the same row or column.
Declaration
var minimumInteritemSpacing: CGFloat { get set }Discussion
If the delegate does not implement the collectionView(_:layout:minimumInteritemSpacingForSectionAt:) method, the flow layout object uses the value of this property to set the spacing between items in the same line.
For a vertically scrolling layout, the value represents the minimum spacing between items in the same row. For a horizontally scrolling layout, the value represents the minimum spacing between items in the same column. The layout object uses this spacing only to compute how many items can fit in a single row or column. The actual spacing may be increased after the number of items has been determined, as illustrated in Figure 1.
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The default value of this property is 10.0.