实用的Delegate学习

实用的Delegate学习：

最好还是去看看原视频，地址在下面

文章来源地址：https://www.bilibili.com/video/av7554622?from=search&seid=13213488219183773854

首先来一个需求：想要获取游戏结束后的玩家的统计：需要最高分的玩家和被捕次数最多的玩家

一般的写法是这样的：

    /// <summary>
    /// 游戏结束时 获得想要的数据
    /// </summary>
    public void OnGameOver(PlayerStats[] allPlayerStats)
    {
        string bestKillName = this.GetPlayerName(allPlayerStats);
        string bestFlagsCaptured = this.GetFlagsCaptured(allPlayerStats);
    }
    

    /// <summary>
    /// 得到杀敌最多的人的名字
    /// </summary>
    private string GetPlayerName(PlayerStats[] allPlayer)
    {
        string name = "";
        int bestScore = 0;

        foreach (PlayerStats stats in allPlayer)
        {
            int score = stats.kills;
            if (score > bestScore)
            {
                bestScore = score;
                name = stats.name;
            }
        }

        return name;
    }

    /// <summary>
    /// 得到被捕次数最多的人的名字
    /// </summary>
    private string GetFlagsCaptured(PlayerStats[] allPlayer)
    {
        string name = "";
        int bestScore = 0;

        foreach (PlayerStats stats in allPlayer)
        {
            int score = stats.flagsCaptured;
            if (score > bestScore)
            {
                bestScore = score;
                name = stats.name;
            }
        }

        return name;
    }

使用委托后的写法是这样的：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/// <summary>
/// 玩家信息保存
/// </summary>
public class PlayerStats
{
    public string name;
    public int kills;
    public int deaths;
    public int flagsCaptured; //被捕次数
}

public class MainScript {

    //定义一个委托
    delegate int WantGetSomething(PlayerStats stats);

    /// <summary>
    /// 游戏结束时 获得想要的数据
    /// </summary>
    /// <param name="allPlayerStats"></param>
    public void OnGameOver(PlayerStats[] allPlayerStats)
    {
        string bestKillName = this.GetPlayerName(allPlayerStats, GetBestKill);
        string bestFlagsCapturedName = this.GetPlayerName(allPlayerStats, GetBestFlags);
    }

    /// <summary>
    /// 返回杀敌人数
    /// </summary>
    private int GetBestKill(PlayerStats stats)
    {
        return stats.kills;
    }

    /// <summary>
    /// 返回被捕次数
    /// </summary>
    private int GetBestFlags(PlayerStats stats)
    {
        return stats.flagsCaptured;
    }

    /// <summary>
    /// 得到杀敌最多的人的名字
    /// </summary>
    /// <param name="allPlayer"></param>
    /// <returns></returns>
    private string GetPlayerName(PlayerStats[] allPlayer, WantGetSomething wantGet)
    {
        string name = "";
        int bestScore = 0;

        foreach (PlayerStats stats in allPlayer)
        {
            int score = wantGet(stats);
            if (score > bestScore)
            {
                bestScore = score;
                name = stats.name;
            }
        }

        return name;
    }

}

总结：总的来说据一句话，将方法作为参数传递。。。。。。。。