Did you check the StreetScroller sample?
https://developer.apple.com/library/ios/samplecode/StreetScroller/Introduction/Intro.html#//apple_ref/doc/uid/DTS40011102
it is the same code that was demonstrated in the WWDC 2011 I told you before.
--
:: marcelo.alves
> On 08/10/2013, at 17:30, Dave <d...@looktowindward.com> wrote:
>
> Hi,
>
> Spoke too soon!
>
> I just can't seem to get my head around this. I can make it work, but I'm
> getting into an infinite loop because updating the scroll view is causing the
> delegates to fire again (AFAICT). I'm not sure what to put in layoutSubviews
> and what to put in the delegate methods. I'm beginning to think this just
> isn't possible with UIScrollView and wondering if I should burn a DTS Support
> Request on it.
>
> This would be so easy if I just had the source to UIScrollView!
>
> All the Best
> Dave
>
>> On 8 Oct 2013, at 20:20, Dave <d...@looktowindward.com> wrote:
>>
>> Hi,
>>
>> I finally managed to get back on this! I've got it working when scrolling
>> from left to right and can detect when the user scrolls past the last item,
>> however, I can't seem to find a way to detect when the user scrolls to
>> before the first item.
>>
>> I get -0 for offset X
>>
>> 2013-10-08 20:18:20.607 LTWScrollTest1[17988:a0b] contentOffset : {-0, 0}
>>
>> But that doesn't do me much good!
>>
>> It seems to work quite nicely going left to right, but having difficulties
>> figuring out how to make it work scrolling right to left.
>>
>>
>> Any idea greatly appreciated as I'm need to get this working for tomorrow
>> morning!
>>
>> Thanks a lot.
>>
>> All the Best
>> Dave
>>
>>
>>
>> On 8 Oct 2013, at 08:56, Kyle Sluder <k...@ksluder.com> wrote:
>>
>>>> On Oct 8, 2013, at 12:44 AM, Dave <d...@looktowindward.com> wrote:
>>>>
>>>> Thanks Kyle,
>>>>
>>>> That's what I was trying to figure out, whether I needed to re-layout the
>>>> views based on the positions or whether I could just do it by keeping an
>>>> Array of the image views separately and rotating this as it scroll past
>>>> the end. I sort of got this working, but of course the Subviews of the
>>>> Scroll View just grows and grows!
>>>>
>>>> This is what I got at the moment:
>>>>
>>>> // Scroll past last item detected (in the scrollViewDidScroll delegate
>>>> method)
>>>>
>>>> if (theScrollView.contentSize.width - theScrollView.contentOffset.x <=
>>>> 1024)
>>>> {
>>>> myContentInfo = [self.pContentArray objectAtIndex:0];
>>>> [self.pContentArray addObject:myContentInfo];
>>>> [self.pContentArray removeObjectAtIndex:0];
>>>>
>>>> [self addContentInfo:myContentInfo withEndFlag:YES];
>>>> }
>>>>
>>>> Which kind of works, but obviously isn't the way to do it.
>>>>
>>>> Thanks for confirming I needed to use -layoutSubviews, I'm about to start
>>>> on this track now.
>>>
>>> You don’t *have* to use -layoutSubviews, but you'll probably get the best
>>> results if you do. You could theoretically do this all in the delegate's
>>> implementation of -scrollViewDidScroll:, but that’ll probably double the
>>> number of layout passes and certainly multiply the number of message sends.
>>> When scrolling, you want to avoid as much unnecessary work as is reasonable.
>>>
>>> It’s kind of a bummer that you’re going to need to split your logic up
>>> between the scroll view and its delegate, thus tightly coupling the two. I
>>> wish the frameworks exposed many more of their delegate hooks as subclass
>>> hooks as well. Scroll views seem to stir this desire particularly
>>> frequently.
>>>
>>> --Kyle Sluder
>>
>>
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>
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