The minimum spacing to use between items in the same row.
- iOS 6.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
If the delegate object does not implement the
collection method, the flow layout uses the value in this property to set the spacing between items in the same line.
For a vertically scrolling grid, this value represents the minimum spacing between items in the same row. For a horizontally scrolling grid, this value represents the minimum spacing between items in the same column. This spacing is used to compute how many items can fit in a single line, but after the number of items is determined, the actual spacing may possibly be adjusted upward.
The default value of this property is 10.0.