On 05/05/2011, at 10:52 AM, Martin Batholdy wrote:
> - (void)updateView {
> [content removeObjectAtIndex:1];
> [table reloadData];
> [table deselectAll:self];
> }
>
>
> and when the menuitem is pressed the following is invoked (in a different
> class):
>
>
> prefShow = [Preferences sharedPrefsWindowController]; ( <- this is my
> singleton)
> [prefShow updateView];
>
>
>
>
> Everything works fine – the updateView method is called and the
> NSMutableArray (content) is also updated properly.
> However nothing changes in the table.
> [table reloadData] seems to have no effect.
Have you checked to see whether removeObjectAtIndex:1 actually succeeds? If the
index is out of bounds, an exception will be thrown and -reloadData will never
be reached. You can easily check that in the debugger. It looks suspicious that
you are hard-coding an index value for an array whose contents are variable.
If you always want to remove the first object, the correct index is 0, but even
that will fail if the array is empty. If you always want to remove the last
object, use [NSArray lastObject], which will return nil if the array is empty.
In general, naming a method -updateView that also removes an object from
<content> is setting yourself up for buggy behaviour. Either separate out the
removal from the update, or else rename the method so it's clear what it
actually does.
--Graham
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