You want to specify collision boundaries between your UI components on the screen so that they will not overlap one another.
Instantiate an object of type
UICollisionBehavior and attach it to your
animator object. Set the
of your collision behavior to
YES and ensure that
your animator is initialized with your superview as its reference value.
This will ensure that the subviews that are the targets of your
collision behavior (as will be discussed soon) will not go outside the
boundaries of your superview.
A collision behavior of type
UICollisionBehavior takes in objects that
conform to the
protocol. All views of type
already conform to this protocol, so all you have to do is instantiate
your views and add them to the collision behavior. A collision behavior
requires you to define the boundaries that the items in the animator
will not be able to go past. For instance, if you define a line that
runs from the bottom-left edge to the bottom-right edge of your
reference view (the bottommost horizontal line of your reference view),
and add a gravity behavior to your view as well, those views will be
pulled down by gravity to the bottom of the view but will not be able to
go further because they will collide with the bottom edge of the view,
defined by the collision behavior.
If you want your reference view’s boundaries to be considered ...