Modifying the angle value on a UIGravityBehavior can lead to a crash

Originator:jerry
Number:rdar://15827347 Date Originated:Jan-15-2014
Status:Open Resolved:
Product:iOS SDK Product Version:7
Classification:Serious Bug Reproducible:Always
 
Summary:
If the dynamicAnimator to which a UIGravityBehavior is attached has been deallocated, and the gravity's angle value is change, a crash occurs.

Steps to Reproduce:
1. Setup a dynamic animator and attach a UIGravity Behavior (do not attach to properties or ivars)
2. With a dispatch_after block, modify the angle of the gravity behavior (ensuring a weak reference to the gravity behavior is not used)

Expected Results:
The modified value should have no effect.

Actual Results:
A crash occurs -- the gravity behavior attempts to modify a value on it's currently bad pointer to it's dynamicAnimator.

Version:
iOS SDK 7

Notes:


Configuration:


Attachments:
https://github.com/jerryhjones/BadGravity

Comments


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