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

for(MyObject *obj in objQueue)
{
//[objQueue removeObject:someof];//NEVER removeObject in a for-in loop
    [self dosomeopearitions];
}

//instead of remove outside of the loop
[objQueue removeAllObjects];