opening iOS BLE setting from app

openBLESetting

        NSURL *bluetoothURLOS8 = [NSURL URLWithString:@"prefs:root=General&path=Bluetooth"];
        NSURL *bluetoothURLOS9 = [NSURL URLWithString:@"prefs:root=Bluetooth"];
        NSURL *bluetoothURLOS10 = [NSURL URLWithString:@"Prefs:root=Bluetooth"];
        if ([[[UIDevice currentDevice] systemVersion] intValue] >= 10) {
            Class<NSObject> workSpaceClass = NSClassFromString(@"LSApplicationWorkspace");
            if (workSpaceClass) {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
                id workSpaceInstance = [workSpaceClass performSelector:NSSelectorFromString(@"defaultWorkspace")];
                SEL selector = NSSelectorFromString(@"openSensitiveURL:withOptions:");
                if ([workSpaceInstance respondsToSelector:selector]) {
                    [workSpaceInstance performSelector:selector withObject:bluetoothURLOS10 withObject:nil];
                }
#pragma clang diagnostic pop

            }
        }
        else if ([[[UIDevice currentDevice] systemVersion] intValue] >= 9) {
            [[UIApplication sharedApplication] openURL:bluetoothURLOS9];
        }
        else {
            [[UIApplication sharedApplication] openURL:bluetoothURLOS8];
        }