自适应分辨率

usingUnityEngine;
namespaceCom.Xyz.UI
{
    [ExecuteInEditMode]
    [RequireComponent(typeof(UIRoot))]
    public classUIScreenAdaptive : MonoBehaviour
    {
        public int aspectRatioWidth = 1280;
        public int aspectRatioHeight = 720;
        public bool runOnlyOnce = false;
        privateUIRoot mRoot;
        private bool mStarted = false;
        private voidAwake()
        {
            UICamera.onScreenResize +=OnScreenResize;
        }
        private voidOnDestroy()
        {
            UICamera.onScreenResize -=OnScreenResize;
        }
        private voidStart()
        {
            mRoot = NGUITools.FindInParents<UIRoot>(this.gameObject);
            mRoot.scalingStyle =UIRoot.Scaling.FixedSize;
            this.Update();
            mStarted = true;
        }
        private voidOnScreenResize()
        {
            if (mStarted &&runOnlyOnce)
            {
                this.Update();
            }
        }
        private voidUpdate()
        {
            float defaultAspectRatio = aspectRatioWidth * 1f /aspectRatioHeight;
            float currentAspectRatio = Screen.width * 1f /Screen.height;
            if (defaultAspectRatio >currentAspectRatio)
            {
                int horizontalManualHeight = Mathf.FloorToInt(aspectRatioWidth /currentAspectRatio);
                mRoot.manualHeight =horizontalManualHeight;
            }
            else
            {
                mRoot.manualHeight =aspectRatioHeight;
            }
            if (runOnlyOnce &&Application.isPlaying)
            {
                this.enabled = false;
            }
        }
    }
}