Graham,
Thanks for your fast response.
I'll look at this ASAP, and will let you know how it goes :-)
Cheers,
Gilles
On Jun 12, 2012, at 2:27 AM, Graham Cox wrote:
>
> On 12/06/2012, at 12:29 AM, Gilles Celli wrote:
>
>> the sheet is properly displayed (with its TextField and button) for the
>> current document window, but the textField stringValue can't be set
>> Maybe because it's the sheet is on a different thread ?…
>>
>> I've tried to get the sheet's textField string setting on the main queue to
>> allow the update, but this doesn't work either….
>> Does someone have any clues ?
>> appendBlock = ^{
>>
>> dispatch_async(dispatch_get_main_queue(), ^{
>> [[appendFilesSheet appendTextField] setStringValue:@"Appending
>> Files..."];
>> //[[appendFilesSheet appendTextField] setNeedsDisplay: YES];
>> NSLog(@"[appendFilesSheet appendTextField] stringValue: %@",
>> [[appendFilesSheet appendTextField] stringValue]);
>> });
>> };
>>
>> //Run the block on a different thread.
>> dispatch_queue_t queue =
>> dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
>> dispatch_async(queue,appendBlock);
>
>
> Since the text field is UI, you can't drive it from a thread other than the
> main thread. I think this includes calling its -setStringValue: method.
>
> So you need to invoke that on the main thread - use [textField
> performSelectorOnMainThread:withObject:waitUntilDone:];
>
> That will only work if you're not also blocking the main thread. I couldn't
> quite unravel your code, but it looks like nothing will happen because the
> main run loop isn't running while your loop is hogging the main thread. If
> you can do your files work on another thread, that could work, otherwise
> you'll have to break down the work your loop does and call it in pieces so
> that the normal work of the main thread is able to run. An easy way to do
> this is to use NSOperationQueue using the +mainQueue object which does the
> work (NSOperations) in pieces on the main thread. If your operations are
> thread-safe, this approach can be changed to a threaded approach by simply
> making an operation queue object of your own.
>
> Another problem is that you start your work as soon as you've called
> beginSheet... on your panel. That method returns very quickly, and before the
> window itself is loaded, animated into position and run modally. That means
> your work has started before the window is available, so it may be that your
> references to its text fields are nil. It might be better to wait until the
> window is actually loaded (windowDidLoad) before doing your work, and make
> sure the work doesn't block the main thread.
>
> --Graham
>
>
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