How to implement guide with updating ui from background thread in objective-c using gcd
I'm writing unit tests and I'm converting an old project and I'm upgrading from an older version and I'm relatively new to this, so bear with me... I'm working with a question when trying to update the UI from a background thread using Grand Central Dispatch (GCD) in my Objective-C project. I'm using an async task to fetch data from a remote API and then I want to update the UI with the results. However, I'm getting the warning 'UI API called on a background thread' when I attempt to set the text of a UILabel on the main thread. Here’s a simplified version of my code: ```objective-c dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ // Simulating network request NSString *fetchedData = [self fetchDataFromAPI]; // Updating the UI dispatch_async(dispatch_get_main_queue(), ^{ self.myLabel.text = fetchedData; }); }); ``` I've ensured that I am dispatching to the main queue for UI updates, but I still see the warning intermittently depending on the API response time. I’ve also tried using `dispatch_sync` to wrap my label update, but that leads to deadlocks in some cases. I’m on Xcode 15.0 and testing on iOS 17. My label is connected properly in Interface Builder, and the `myLabel` is not nil when accessed. Is there something I'm missing in this process, or could there be another scenario causing this warning? For context: I'm using Objective-C on Linux. I'd really appreciate any guidance on this. I'd be grateful for any help. The stack includes Objective-C and several other technologies. This is my first time working with Objective-C 3.11.