Question

I’ve got a feature I’d like to implement that will require me to get the date the app was first opened, or installed. For future installations, I can do that by ensuring I save the first launch date in NSUserDefaults, but is there any way to do that for those who will have already had my app installed?

Answer 1

You might be able to use NSFileManager and read the creationDate property for your Documents directory:

NSString *libraryDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSDictionary *fileAttributeForDirectory = [[NSFileManager defaultManager] attributesOfItemAtPath: libraryDirectory error: nil];
NSLog(@"creation date = %@", [fileAttributeForDirectory objectForKey: NSFileCreationDate]);