每天一点小知识001--unity在ios系统的文件读取

通过http://blog.csdn.net/joyhen/article/details/8572094这个博客修改的代码，unity在ios的文件操作必须通过流来读取写入。否则文件放在沙盒位置也是读不出来的

using UnityEngine;
using System.Collections;
using System;
using System.IO;
using System.Text;

public class FileHandle {

private FileHandle(){}
public static readonly FileHandle instance = new FileHandle();

//the filepath if there is a file
public bool isExistFile(string filepath){
return File.Exists(filepath);
}

public bool IsExistDirectory(string directorypath){
return Directory.Exists(directorypath);
}

public bool Contains(string Path,string seachpattern){
try{
string[] fileNames = GetFilenNames(Path,seachpattern,false);
return fileNames.Length!=0;
}
catch{
return false;
}
}

//return a file all rows
public static int GetLineCount(string filepath){
string[] rows = File.ReadAllLines(filepath);
return rows.Length;
}

public bool CreateFile(string filepath){
try{
if(!isExistFile(filepath)){
StreamWriter sw;
FileInfo file = new FileInfo(filepath);
//FileStream fs = file.Create();
//fs.Close();
sw = file.CreateText();
sw.Close();
}
}
catch{
return false;
}
return true;
}

public string[] GetFilenNames(string directorypath,string searchpattern,bool isSearchChild){
if(!IsExistDirectory(directorypath)){
throw new FileNotFoundException();
}
try{

return Directory.GetFiles(directorypath,searchpattern,isSearchChild?SearchOption.AllDirectories:SearchOption.TopDirectoryOnly);
}
catch{
return null;
}

}

public void WriteText(string filepath,string content)
{
//File.WriteAllText(filepath,content);
FileStream fs = new FileStream(filepath,FileMode.Append);
StreamWriter sw = new StreamWriter(fs,Encoding.UTF8);
sw.WriteLine(content);
sw.Close();
fs.Close();
Debug.Log("write: filepath: "+filepath);
Debug.Log("write: content: "+content);
Debug.Log("写入完毕");
}

public void AppendText(string filepath,string content){
File.AppendAllText(filepath,content);
}

public string FileToString(string filepath,Encoding encoding){
FileStream fs = new FileStream(filepath,FileMode.Open,FileAccess.Read);
StreamReader reader = new StreamReader(fs,encoding);
try{
return reader.ReadToEnd();
}
catch{
return string.Empty;
}
finally{
fs.Close();
reader.Close();
Debug.Log("读取完毕");
}
}

public void ClearFile(string filepath){
File.Delete(filepath);
CreateFile(filepath);
}

}