Unity3D UGUI实现Toast

using UnityEngine;
using UnityEngine.UI;
// 该类与LTToastManager强调用耦合
// PS:本来是想写成参数传递进入的，但是想了想这两块代码本就是一个模块
// 能不能算在内聚里面 O(∩_∩)O~
public class LTToast : MonoBehaviour
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    public enum Position
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        Bottom, Top, Custom
    ｝
    public Image background;
    public Text toastStr;
    public const float DURING_LONG = 1f;
    public const float DURING_SHOR = 0.5f;
    private const string ENTER_KEY = "enter";
    private const string EXIT_KEY = "exit";
    #region Top位置固定参数
    private static Vector2 TopAnchorMin = new Vector2(0, 1);
    private static Vector2 TopAnchorMax = new Vector2(1, 1);
    private static Vector2 TopPivot = new Vector2(0.5f, 1);
    private static Vector3 TopAnchoredPosition3D = new Vector3(0, 0, 0);
    private static Vector2 TopSizeDelta = new Vector3(0, 50);
    #endregion
    #region Bottom位置固定参数
    private static Vector2 BottomAnchorMin = new Vector2(0, 0);
    private static Vector2 BottomAnchorMax = new Vector2(1, 0);
    private static Vector2 BottomPivot = new Vector2(0.5f, 0);
    private static Vector3 BottomAnchoredPosition3D = new Vector3(0, 0, 0);
    private static Vector2 BottomSizeDelta = new Vector3(0, 50);
    #endregion
    #region 自定义位置参数
    private Vector2 customAnchorMin = new Vector2(0, 0);
    private Vector2 customAnchorMax = new Vector2(1, 0);
    private Vector2 customPivot = new Vector2(0.5f, 0);
    private Vector3 customAnchoredPosition3D = new Vector3(0, 0, 0);
    private Vector2 customSizeDelta = new Vector3(0, 50);
    #endregion
    private RectTransform rectTransform;
    private Animator mAnimator;
    private float duringTime = DURING_SHOR;
    private Position showPosition = Position.Top;
    private bool isExit = false;
    void Awake()
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        rectTransform = this.GetComponent<RectTransform>();
        mAnimator = this.GetComponent<Animator>();
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    public void SetColor(Color backColor, Color textColor)
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        background.color = backColor;
        toastStr.color = textColor;
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    public void SetDuring(float duringTime)
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        this.duringTime = duringTime;
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    public void SetText(string str)
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        toastStr.text = str;
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    public void SetPositionAndSize(Position showPosition)
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        this.showPosition = showPosition;
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    public void SetPositionAndSize(Vector2 min, Vector2 max, Vector2 pivot, Vector3 anchoredPosition, Vector2 size)
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        showPosition = Position.Custom;
        customAnchorMin = min;
        customAnchorMax = max;
        customPivot = pivot;
        customAnchoredPosition3D = anchoredPosition;
        customSizeDelta = size;
    ｝
    private void SetPositionAndSize()
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        if (showPosition == Position.Top)
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            rectTransform.anchorMin = TopAnchorMin;
            rectTransform.anchorMax = TopAnchorMax;
            rectTransform.pivot = TopPivot;
            rectTransform.anchoredPosition3D = TopAnchoredPosition3D;
            rectTransform.sizeDelta = TopSizeDelta;
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        else if (showPosition == Position.Bottom)
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            rectTransform.anchorMin = BottomAnchorMin;
            rectTransform.anchorMax = BottomAnchorMax;
            rectTransform.pivot = BottomPivot;
            rectTransform.anchoredPosition3D = BottomAnchoredPosition3D;
            rectTransform.sizeDelta = BottomSizeDelta;
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        else if (showPosition == Position.Custom)
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            rectTransform.anchorMin = customAnchorMin;
            rectTransform.anchorMax = customAnchorMax;
            rectTransform.pivot = customPivot;
            rectTransform.anchoredPosition3D = customAnchoredPosition3D;
            rectTransform.sizeDelta = customSizeDelta;
        ｝
        else
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            Debug.LogError("检测到未定义位置，采用默认位置");
            rectTransform.anchorMin = TopAnchorMin;
            rectTransform.anchorMax = TopAnchorMax;
            rectTransform.pivot = TopPivot;
            rectTransform.anchoredPosition3D = TopAnchoredPosition3D;
            rectTransform.sizeDelta = TopSizeDelta;
        ｝
    ｝
    public void Show()
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        isExit = false;
        // 强耦合
        transform.SetParent(LTToastManager.Instance._ShowCanvas.transform);
        // 设置位置及缩放的代码建议放在SetParent之后，防止蛋疼
        transform.localScale = Vector3.one;
        SetPositionAndSize();
        mAnimator.Play(ENTER_KEY);
    ｝
    public void Cancel()
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        if (isExit)
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            return;
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        mAnimator.Play(EXIT_KEY);
        isExit = true;
    ｝
    // UI帧调用，请勿更改
    void EnterDone()
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        Invoke("Cancel", duringTime);
    ｝
    // UI帧调用，请勿更改
    void ExitDone()
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        // 强耦合
        transform.SetParent(LTToastManager.Instance.transform);
        LTToastManager.Instance.ReturnToast(this);
    ｝
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