Strange Behavior When Using NSUserDefaults with App Groups in Objective-C
I'm performance testing and I'm working with a frustrating scenario while trying to share data between my main app and its extension using NSUserDefaults with app groups. I've set up my app group correctly in the capabilities section and made sure to use the correct suite name. However, when I attempt to retrieve data stored in NSUserDefaults from my app extension, it often returns `nil`, even though I'm sure the data was written successfully. Here's the code I'm using to write data to NSUserDefaults in the main app: ```objective-c NSUserDefaults *sharedDefaults = [[NSUserDefaults alloc] initWithSuiteName:@"group.com.example.myapp"]; [sharedDefaults setObject:@"Hello, World!" forKey:@"sharedString"]; [sharedDefaults synchronize]; ``` And in my app extension, I try to read the same key like this: ```objective-c NSUserDefaults *sharedDefaults = [[NSUserDefaults alloc] initWithSuiteName:@"group.com.example.myapp"]; NSString *sharedString = [sharedDefaults stringForKey:@"sharedString"]; NSLog(@"Shared String: %@", sharedString); ``` Despite calling `synchronize` after writing, it seems like the data isn't being shared properly. I also made sure that both targets are using the same app group identifier. I’ve tried cleaning the build, resetting the simulator, and even uninstalling and reinstalling the app, but the question continues. The console shows no errors, just an empty log for the shared string. Is there something I'm missing about the timing of data accessibility between the app and the extension, or could it be a configuration scenario? Any insights would be appreciated! For context: I'm using Objective-C on Linux. I'm working on a service that needs to handle this.