On 29/12/2009, at 4:00 AM, Joar Wingfors wrote:
>> NSInteger i = 0;
>> while ([[self trackingAreas] count]==0) {
>> [self removeTrackingArea:[[self trackingAreas]
>> objectAtIndex:i]];
>> i++;
>> }
>
>
> That loop seems all kinds of wrong... ;-)
>
> How about:
>
> for (NSTrackingArea *trackingArea in [self trackingAreas]) {
> [self removeTrackingArea:trackingArea];
> }
Wouldn't this fall foul of the usual problem with deleting items from the
collection being iterated, in that it will skip every other object? (Or perhaps
fast enumeration has a built-in protection against that?)
The first loop is also wrong in that its terminating condition is backwards
(should be >0) as well as having the skip every other object problem. If you
want to remove items from the collection being iterated, you should copy the
collection temporarily and iterate that or iterate it by index backwards.
--Graham
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