how can I get the array index within an “for (id item in items)” objective-c loop?

Question

How can I get the array index within a \"for (id item in items)\" loop in objective-c? For NSArray or NSMutableArray for example.

For example:

for (         


        

Answer 1

Alternatively, you can use -enumerateObjectsUsingBlock:, which passes both the array element and the corresponding index as arguments to the block:

[items enumerateObjectsUsingBlock:^(id item, NSUInteger idx, BOOL *stop)
{
    …
}];

Bonus: concurrent execution of the block operation on the array elements:

[items enumerateObjectsWithOptions:NSEnumerationConcurrent
    usingBlock:^(id item, NSUInteger idx, BOOL *stop)
{
    …
}];

Answer 2

Only way I can think of is:

NSUInteger count = 0;
for (id item in items)
{
    //do stuff using count as your index
    count++;
}

---

Bad Way

Alternatively, you can use the indexOfObject: message of a NSArray to get the index:

NSUInteger index;
for (id item in items)
{
    index = [items indexOfObject:item];
    //do stuff using index
}