在Unity中，官方有自带的用户名密码保存的方法。如下
```
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class PlayerPrfsTest : MonoBehaviour {
public InputField NameField;
public InputField PwdField;
void Start () {
//判断有没有叫name的key
if(PlayerPrefs.HasKey("name")){
//有的话，获取name的值
NameField.text = PlayerPrefs.GetString ("name");
}
if(PlayerPrefs.HasKey("password")){
PwdField.text = PlayerPrefs.GetString ("password");
}
//删除
//PlayerPrefs.DeleteKey ("name");
//PlayerPrefs.DeleteAll();
}
public void LoginClick () {
//一系列的判断+登录操作
//......
//用户名密码保存下来
PlayerPrefs.SetString("name",NameField.text);
PlayerPrefs.SetString ("password",PwdField.text);
}
}
```
