JJBB/Assets/Plugins/Script/FirstScene/FirstSceneBg.cs

using UnityEngine;
using UnityEngine.UI;

public class FirstSceneBg : MonoBehaviour
{
    private RawImage _bg;
    private RawImage _logo;
    private float _publishDelta;
    private Text _publishText;
    private Text _tip;
    private Text _gameVersion;
    public static FirstSceneBg instance { get; private set; }

    private void Awake()
    {
        instance = this;
        DontDestroyOnLoad(gameObject);
        _bg = transform.Find("BG").GetComponent<RawImage>();
        _logo = transform.Find("Logo").GetComponent<RawImage>();
        _tip = transform.Find("DownloadTip/Text").GetComponent<Text>();
        _publishText = transform.Find("PublishText/Text").GetComponent<Text>();
        _gameVersion = transform.Find("Version").GetComponent<Text>();
        var publishBg = (RectTransform) _publishText.rectTransform.parent;
        _publishDelta = publishBg.sizeDelta.y - _publishText.preferredHeight;
        publishBg.gameObject.SetActive(false);
    }

    private void Start()
    {
        AssetUpdateDownloaderTick.instance.LoadStreamingAsset("ExTextures/PacketRes/LoginBG.jpg", OnBgLoad);
        AssetUpdateDownloaderTick.instance.LoadStreamingAsset("ExTextures/PacketRes/Logo.png", OnLogoLoad);
        // 适配健康游戏忠告
        var healthy = (RectTransform)transform.Find("HealthyGaming");
        var healthyText = healthy.Find("Text").GetComponent<Text>();
        var sizeDelta = healthy.sizeDelta;
        sizeDelta.y = healthyText.preferredHeight + 10f;
        healthy.sizeDelta = sizeDelta;
    }

    private void OnDestroy()
    {
        instance = null;
    }

    public static void CreateInstance()
    {
        var prefab = Resources.Load<GameObject>("Prefab/FirstSceneBg");
        if (prefab)
        {
            var item = Instantiate(prefab, Vector3.zero, Quaternion.identity);
            var firstBg = item.AddComponent<FirstSceneBg>();
            firstBg.SetTip("检查资源版本中...");
        }
    }

    public void ShowTip(bool isShow)
    {
        _tip.transform.parent.gameObject.SetActive(isShow);
    }

    public void ShowGameVersion()
    {
        _gameVersion.text = string.Format("游戏版本：{0}.{1}", Application.version, AssetUpdateManager.LoadCurrentVersion());
        float posY;
        if (_publishText.gameObject.activeInHierarchy)
        {
            var publishBg = (RectTransform) _publishText.rectTransform.parent;
            var sizeDelta = publishBg.sizeDelta;
            posY = sizeDelta.y;
        }
        else
            posY = 0f;
        var rectTransform = _gameVersion.rectTransform;
        var pos = rectTransform.anchoredPosition;
        pos.y = posY;
        rectTransform.anchoredPosition = pos;
    }

    public void SetTip(string text)
    {
        _tip.text = text;
    }

    public void SetPublishText(string text)
    {
        _publishText.text = text;
        // 试图适配屏幕Dpi
        var canvasRect = (RectTransform)_publishText.rectTransform.root;
        var fontSize = Mathf.CeilToInt(canvasRect.sizeDelta.y * (20f / 720f));
        _publishText.fontSize = fontSize;
        var publishBg = (RectTransform) _publishText.rectTransform.parent;
        var sizeDelta = publishBg.sizeDelta;
        sizeDelta.y = _publishText.preferredHeight + _publishDelta;
        publishBg.sizeDelta = sizeDelta;
        publishBg.gameObject.SetActive(true);
    }

    private void OnBgLoad(WWW www)
    {
        Texture2D texture = null;
        if (string.IsNullOrEmpty(www.error))
            texture = www.texture;
        if (texture)
        {
            _bg.texture = texture;
            _bg.color = Color.white;
            var rootSize = ((RectTransform) transform.root).sizeDelta;
            var ratio = Mathf.Max(rootSize.x / texture.width , rootSize.y / texture.height);
            var sizeDelta = new Vector2(texture.width, texture.height) * ratio + Vector2.one * 5f;
            _bg.rectTransform.sizeDelta = sizeDelta;
        }
    }

    private void OnLogoLoad(WWW www)
    {
        Texture2D texture = null;
        if (string.IsNullOrEmpty(www.error))
            texture = www.texture;
        if (texture)
        {
            _logo.texture = texture;
            _logo.color = Color.white;
            _logo.rectTransform.sizeDelta = new Vector2(texture.width, texture.height);
        }
    }
}