Priorities
Each constraint may specify an optional priority by adding an at sign (@) and a number or metric. For example, you can say that you want a view to be 500 points wide but that the request has a relatively low priority:
[view1(500@10)]
You place priorities after predicates. Here’s an example of a layout format string with an embedded priority:
[view1]-(>=50@30)-[view2]
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