Question

I’m iterating a NSArray in objective-c with:

for (id object in array1) {
  ...
}

I now have another array2, and I need to access with the same index of the current array1.

Should I use another for statement ?

thanks

Answer 1

You have several options:

1. Use c-style for loop as Dan suggested

2. Keep track of current index in a separate variable in fast-enumeration approach:

   int index = 0;
   for (id object in array1) {
      id object2 = [array2 objectAtIndex:index];
      ...
      ++index;
   }
   

3. Use enumerateObjectsUsingBlock: method (OS 4.0+):

   [array1 enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop){
       id obj2 = [array2 objectAtIndex:idx];
       ...
   }];