Avoiding “NSArray was mutated while being enumerated”

Question

I have an NSMutableArray that stores mousejoints for a Box2d physics simulation. When using more than one finger to play I\'ll get exceptions stating

Answer 1

I have come across this error and in my case it was because of the multi-threaded situation. One thread was enumerating an array while another thread removed objects from the same array at the same time. Hope this helps someone.