Orientation
You start with an optional orientation—either H: for horizontal or V: for vertical alignment. This specifies whether the constraint applies left and right or up and down. If omitted, the orientation defaults to horizontal. Consider this constraint: "H:[view1][view2]". It says to place View 2 directly to the right of View 1. The H specifies the alignment that the constraint follows. Figure 5-2 (left) shows an interface that uses this rule.
Figure 5-2 Layout results for "H:[view1][view2]" (left) and "V:|[view1]-20-[view2]-20-[view3]" (right).
The following is an example of a vertical layout: "V:|[view1]-20-[view2]-20-[view3]". It leaves ...
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