Why can't I add a Joint to the Scene physicsWorld in SpriteKit

Question

I'm trying to add a joint to the scene physicsWorld property, but I am getting a EXC_BAD_ACCESS. This is the code I'm using.

SKPhysicsJointFixed *fixedJoint = [SKPhysicsJointFixed jointWithBodyA:self.mousePoint.physicsBody bodyB: self.box.physicsBody anchor:touchPoint];

[self.physicsWorld addJoint:fixedJoint]; // Error happens here.

I'm calling it when a touch begins. Does anyone know whats going on?

Answer 1

i encountered the same problem with you, the answer is very easy, just add the node to the scene before adding it to the physicsworld.