unity-atoms/Examples/Assets/UniRx/UI/HealthBarUniRx.cs

using UnityEngine;
using UnityEngine.UI;
using UniRx;

namespace UnityAtoms.Examples
{
    public class HealthBarUniRx : MonoBehaviour
    {
        [SerializeField]
        private IntConstant _maxHealth = null;
        [SerializeField]
        private IntVariable _health = null;

        void Awake()
        {
            _health.ObserveChange().Subscribe(health =>
            {
                GetComponent<Image>().fillAmount = 1.0f * health / _maxHealth.Value;
            });
        }
    }
}