Re: Accessing items in a UIScrollView?
Re: Accessing items in a UIScrollView?
- Subject: Re: Accessing items in a UIScrollView?
- From: "Eric E. Dolecki" <email@hidden>
- Date: Fri, 30 Jul 2010 16:28:57 -0400
Thanks - I'm just using a NSMutable array now and doing it that way which
works great.
On Fri, Jul 30, 2010 at 3:30 PM, Fritz Anderson <email@hidden>wrote:
> On 30 Jul 2010, at 2:14 PM, Eric E. Dolecki wrote:
>
> > -(void) buttonClicked:(id)sender
> > {
> > int tag = [sender tag];
> >
> > for(int i=0;i<20;i++){
> > BasicListItem *tmp = (BasicListItem*)[scrollView viewWithTag:i];
> >
> > if( tag != i ){
> > [tmp setState:NO]; //Barf here
> > }
> > }
> > NSLog(@"%d",tag);
> > }
> >
> >
> > *** Terminating app due to uncaught exception
> 'NSInvalidArgumentException',
> > reason: '-[UIScrollView setState:]: unrecognized selector sent to
> instance
> > 0x593e820'
> >
> >
> > How can I dig into the scrollview and access those BasicListItem objects?
>
> 1. Use the blasted NSArray. It's a data structure that accesses a group of
> objects in order, by a numeric index, and can be efficiently iterated.
> That's what you want.
>
> -(void) buttonClicked: (id) sender
> {
> for (BasicListItem * item in self.listItemArray)
> item.state = (item == sender);
> }
>
> 2. This is what the documentation says -[UIView viewWithTag:] returns:
>
> > The view in the receiver’s hierarchy that matches tag. The receiver is
> included in the search.
>
> I assume you left the scroll view's tag at zero? The exception label is the
> clue: It says you sent setState: to the scroll view.
>
> — F
>
>
--
http://ericd.net
Interactive design and development
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