Subclass of Gkgraphnode Costtonode Method Never Getting Called

`-costToNode:` Not Sent to GKGraphNode2D Subclass in GameplayKit

Apple responded to my developer support ticket related to this issue and told me it was a known issue, and that there was a potential fix in the iOS SDK 9.2 beta 2, released November 3, 2015. I verified that the tests in my test project pass in 9.2b2, and so I expect that version to resolve this issue.

GKGraph Incorrectly Calculates Path with GKGraphNode2D-Subclassed Nodes

As of Xcode 8.0 beta 1 (8S128d) and iOS 10 beta 1 (14A5261v), this issue seems to be resolved.

Uninitialized Automatic variable forcing value to random value

What you see here is an artifact of how memory is usually allotted to processes on Unix.

Since the stack segment is not stored in the disk-file image of the executable the OS has to allocate new pages to the stack at program start. These come as zero-filled initially, same as the .bss. This initial zero-filling of the stack is historical. There was an attempt to "simplify" it to not do that. Too many programs broke, so the move was abandoned.

Run your program for a while, make multiple function calls, - you'll see "junk" on the stack eventually :)

---

Related Topics