This is for MacOS not iOS.
If your running code on a GCD queue
dispatch_sync(dispatch_get_main_queue(), ^{
//do UI stuff
});
is pretty much the way to do UI stuff on the main thread/queue which seems to
work well for iOS. MacOS seems to be a different story. Try this for a simple
example
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,
0), ^{
// So my app is doing some background stuff
// and I need a file from the user so
// code blah blah code
dispatch_sync(dispatch_get_main_queue(), ^{
NSOpenPanel *op = [NSOpenPanel openPanel];
[op runModal];
});
// resume code blah blah code
});
}
when the NSOpenPanel opens all kinds of weirdness is going on. The scroll views
scroll very erratically if at all and the directories don't list properly. I'm
just using the NSOpenPanel here as an example, this also happens with any view
that contains a scroll view (so I've tested so far). Is this a bug? Are others
seeing this or is it just me and is there another preferred way of doing this?
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