对外的监听消息，可以通过MessageDispatcher.SendMessage(MessageName.XXX.ToString());来实现对应功能
/// <summary>
/// 消息名称
/// </summary>
public enum MessageName {
    /// <summary>
    /// 小地图缩小
    /// </summary>
    MiniMapShrink,
    /// <summary>
    /// 小地图放大
    /// </summary>
    MiniMapEnlarge,
    /// <summary>
    /// 小地图缩放
    /// </summary>
    MiniMapZoom,
    /// <summary>
    /// 复位相机
    /// </summary>
    RestCamera,
    /// <summary>
    /// 小地图右键点击
    /// </summary>
    MiniMapRightClick

Inspector 可修改参数
	//缩放速度
    public float zoomSpeed = 10;
    //相机最小值
    public float zoomMin = 50;
    //相机最大值
    public float zoomMax = 300;
    //当前相机大小
    private float currentSize = 50;
    //相机视野边界最大值
    public Vector2 PosToWorldMax = new Vector2(700f,450);
    //相机视野边界最小值
    public Vector2 PosToWorldMin = new Vector2(-1700f,-1700);
}