IOS 10 requires a new URL. Try using this code that checks both URLs:
NSArray* urlStrings = @[@"prefs:root=General&path=Keyboard/KEYBOARDS", @"App-Prefs:root=General&path=Keyboard/KEYBOARDS"]; for(NSString* urlString in urlStrings){ NSURL* url = [NSURL URLWithString:urlString]; if([[UIApplication sharedApplication] canOpenURL:url]){ [[UIApplication sharedApplication] openURL:url]; break; } }
Drico source share