Hi,
This doesn’t work probably because the Class is that is calling back the
delegate method that updates the Scroll View is also being run on the main
thread. Sorry I should have said this earlier. I tried updating the UI on a
background thread and it seemed to work BUT I got warning message from CALayer
or maybe CATransaction and I think it caused the App to hang.
The time consuming method I am calling is in a third party library and it must
be called in the main thread.
All the Best
Dave
> On 21 Sep 2016, at 17:01, Sandor Szatmari <admin.szatmari....@gmail.com>
> wrote:
>
> In general, one simple form is:
>
> dispatch_async( dispatch_get_main_queue(), ^{
> // do UI updates on the main thread.
> });
>
> This can also be done with NSOperationQueue:
>
> [[NSOperationQueue mainQueue] addOperationWithBlock:^{
> // do UI updates on main thread.
> }];
>
> Sandor Szatmari
>
> On Sep 21, 2016, at 11:40, Dave <d...@looktowindward.com
> <mailto:d...@looktowindward.com>> wrote:
>
>> Hi All,
>>
>> How can I update my UI from a background thread?
>>
>> I have a method that does a LOT of intense processing, it calls a delegate
>> method in my Window Controller which appends it to a Logging Scroll View,
>> however nothing shows up in the Scroll View although it NSLog’s the string
>> ok.
>>
>> Firstly is it ok to do this? When I tried it I got a CALayer error reported
>> in the NSLog output.
>>
>> All the Best
>> Dave
>>
>>
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