requestPermission method
Request iOS notification permissions. Returns true if granted.
Implementation
Future<bool> requestPermission() async {
final ios = _plugin
.resolvePlatformSpecificImplementation<
IOSFlutterLocalNotificationsPlugin
>();
if (ios == null) return false;
final result = await ios.requestPermissions(
alert: true,
badge: true,
sound: true,
);
return result ?? false;
}