flutter how to set rotation code example

Example 1: transform.rotate flutter

// This example rotates an orange box containing text around its center by fifteen degrees
Transform.rotate(
  angle: -math.pi / 12.0,
  child: Container(
    padding: const EdgeInsets.all(8.0),
    color: const Color(0xFFE8581C),
    child: const Text('Apartment for rent!'),
  ),
)

Example 2: flutter block rotation

class MyApp extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
    // This vvvv
      SystemChrome.setPreferredOrientations([
        DeviceOrientation.portraitUp,
        DeviceOrientation.portraitDown,
      ]);
    // ^^^^
      return new MaterialApp(...);
    }
  }