Why are didBeginContact called multiple times?

Question

In an iOS game that uses Sprite Kit along with the contact detection in Sprite Kit\'s build-in physics engine, I decrease the Hero\'s number lives by one each time he gets i

Answer 1

I came across the same issue. In my case the didBeginContact() was called many times (I counted up to 5 times) for one contact of a bullet with the enemy. As the bullet is a simple circle format, I agree with @SFX that it cannot be a bug just in Texture-Bodies. The tests have shown that there was no call to update() between the didBeginContact() calls. So the solution is simple (Swift):

var updatesCalled = 0
...
internal update() {
  updatesCalled ++
}
...
internal func didBeginContact(contact: SKPhysicsContact) {
    NSLog("didBeginContact: (\(contact.contactPoint.x), \(contact.contactPoint.y)), \(updatesCalled)")
    if(updatesCalled == 0) {return} // No real change since last call
    updatesCalled = 0
    ... your code here ...
}

I tried didEndContact() but that was not called at all. I didn't investigate further into this.

BTW: I just switched from Android, and I'm impressed by the easiness and stability of this System :-)