Didbegincontact Passed Pkphyicsobject

didBeginContact passed PKPhyicsObject

I get the same error with this simple code:

extension SKPhysicsContact {
    func bodiesMatchingCategory(mask: UInt32) -> [SKPhysicsBody] {
        let bodies = [bodyA, bodyB]
        return bodies.filter { ($0.categoryBitMask & mask) != 0 }
    }
}

let contact = SKPhysicsContact()
let body = contact.bodiesMatchingCategory(0)

The problem is, the type of contact is PKPhysicsContact (as you've noticed), even when you explicitly tell it to be an SKPhysicsContact, and the extension is on SKPhysicsContact. You'd have to be able to make an extension to PKPhysicsContact for this to work. From this logic, we can say that no instance methods will work in SKPhysicsContact extensions at the moment. I'd say it's a bug with SpriteKit, and you should file a radar. Class methods still work since you call them on the class itself.

In the meantime, you should be able to move that method into your scene or another object and call it there successfully.

For the record, this is not a Swift-specific problem. If you make the same method in an Objective-C category on SKPhysicsContact you'll get the same crash.

extension for SKPhysicsContact crashing

This apparently is a bug, as answered here:
https://stackoverflow.com/a/33423409/6593818

The problem is, the type of contact is PKPhysicsContact (as you've noticed), even when you explicitly tell it to be an SKPhysicsContact, and the extension is on SKPhysicsContact. You'd have to be able to make an extension to PKPhysicsContact for this to work. From this logic, we can say that no instance methods will work in SKPhysicsContact extensions at the moment. I'd say it's a bug with SpriteKit, and you should file a radar. Class methods still work since you call them on the class itself.

In the meantime, you should be able to move that method into your scene or another object and call it there successfully.

For the record, this is not a Swift-specific problem. If you make the same method in an Objective-C category on SKPhysicsContact you'll get the same crash.

You can submit a bug report to apple:

https://developer.apple.com/bug-reporting/

And report it to the community:

https://openradar.appspot.com/search?query=spritekit

However, what you really want to do with your code is to add the category masks together. And then check for the sum (2 + 4 and 4 + 2 always equals 6, regardless of bodyA and bodyB order).

This is how you get unique contacts, if you set up your masks correctly in powers of two (2, 4, 8, 16, etc)

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