indexSetWithIndexesInRange is not doing what expected

Question

I want to select some objects from an array. Therefore I'm using begin and end indexes of my selection. ``` NSLog(@"start:%d
end:%d", startIndex, endIndex); NSIndexSet *myIndexes = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(startIndex, endIndex)]; NSLog(@"%d", [myIndexes lastIndex]); ``` The first NSLog gives me startIndex:49 endIndex:67 The second NSLog gives me 115 Why do I have 115 as highest number? It should be 67. Of course the app crashes: Terminating app due to uncaught exception 'NSRangeException', reason: '* -[NSArray objectsAtIndexes:]: index 115 beyond bounds [0 .. 96]' What I'm doing wrong?

Accepted Answer

`NSRange`'s members are `location` and `length`, not `start` and `end`. This means you need to create your `NSRange` struct like this:

```
NSMakeRange(startIndex, endIndex - startIndex);
```

indexSetWithIndexesInRange is not doing what expected

Solution

Problem