The type of collision bounds associated with the item.
- iOS 9.0+
- tvOS 9.0+
The dynamics system uses this property to determine how to evaluate collisions with the dynamic item. Rectangular and elliptical bounds are defined by the
bounds property of the item. For custom collision bounds, the shape of the bounds are in the
If you implement this property in your dynamic item and set its value to
UIDynamic, you must also implement the
collision property and provide a valid path. Failure to do so is a programmer error.
The default value of this property is