One more “Mutated while being enumerated” issue
ios,objective-c,fast-enumeration
If you have an inverse relationship from groups back to the value entity, then adding the entity to a group will modify the value.groups property - which will cause your error as your outer loop is enumerating value.groups. Either remove the inverse relationship, or if you need to keep it,...
Objective-C can you use fast enumeration in place of “for (i = 0; i < X; i++)”
objective-c,objective-c-blocks,fast-enumeration
No. Fast enumeration is a technique for maintaining iteration state such that iteration over collections is more efficient. It overcomes the fact that many collections do not index in O(1), so iterating over them via indexing would be something greater than O(N). Even collections that do index in O(1) may...
What happens when you declare the pointer outside of the fast enumeration loop in objective c?
There should be no difference in terms of cost, it's just a difference in scope. With the pointer defined outside the loop it will continue to be defined after the loop has run (and would contain a pointer to the last item enumerated if you break out of the loop)...
How to pause a for loop in objective C, Spritekit
objective-c,for-loop,sprite-kit,fast-enumeration
As a matter of style you'd normally reformat the loop to be tail recursive. So, instead of: for(i = 0; i < 10; i++) { // ... work here ... } You'd reformulate as: void doWorkForIteration(int i, int limit) { if(i == limit) return; // ... work here ... doWorkForIteration(i+1,...