Hi,
I'm currently running into this issue trying to use Telerik Test Studio (and am
asking about it there as well), but I think the issue is more general and would
like some ideas.
The situation: Test Studio drives my app's user interface from a background
thread. In some places where the Test Studio is just interacting wth UI
elements, I get a WebThreadLockFromAnyThread warnings (which is expected since
you shouldn't interact with the UI from another thread). I believe they've done
the coding to avoid the warning in most cases, but I've got some subclasses of
UITextField that are generating the warnings. Note, in all examples, self is an
object whose class is a subclass of UITextField.
In some places, the solution is to use blocks, replacing:
[self.objectField reloadInputViews];
with:
dispatch_async(dispatch_get_main_queue(), ^{ [self.objectField
reloadInputViews]; });
which works. The problem is places where I want to read the data. In those
cases, replacing:
NSString* theName = self.text;
with:
__block NSString* theName = nil;
dispatch_sync(dispatch_get_main_queue(), ^{ theName = self.text; });
will block the main thread if run from the main thread (note that I really need
a dispatch_sync so I can get the return value before continuing). So I end up
with the replacement:
__block NSString* theName = nil;
if ([NSThread isMainThread])
{
theName = self.text;
}
else
{
dispatch_sync(dispatch_get_main_queue(), ^{ theName =
self.text; });
}
which is now looking like an awful lot of work just to read a data value and
adding a lot of extra code just to accommodate Test Studio.
So the questions:
Are there any pitfalls to the replacements above that I'm missing?
Should I be doing this in any case to make my code safer?
Is there a better way to go about accessing self.text that works on any thread?
If I wanted to actually update self.text from any thread (haven't needed to do
this yet, but it may arise) would the code below be my best option?
if ([NSThread isMainThread])
{
self.text = theName;
}
else
{
dispatch_sync(dispatch_get_main_queue(), ^{ self.text =
theName; });
}
Thanks,
Aaron
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