IOS 保存读取Token到沙盒

/**
 *  保存TOKEN
 *
 *  @param token <#token description#>
 */
+(void)savaToken:(BZToken *) token
{
    //2.沙河路径
    NSLog(@"沙盒Path：%@",NSHomeDirectory());
    
    //3.写入信息
    //3.1 获取应用程序沙盒的Documents目录
    NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
    NSString *path=[paths objectAtIndex:0];
    
    //3.2 得到完整的文件名
    NSString *filename=[path stringByAppendingPathComponent:TOKEN_PLIST];
    
    //3.3 需要保存的数据 value token.access_token  key access_token
    NSDictionary* dic = [NSDictionary dictionaryWithObjectsAndKeys:token.access_token,@"access_token",nil];
    
    //3.4 写入数据
    [dic writeToFile:filename atomically:YES];
    
    
}

/**
 *  读取Token
 */
+(NSString *)readToken
{
    //1 获取应用程序沙盒的Documents目录
    NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
    NSString *path=[paths objectAtIndex:0];
    
    //2 完成路径
    NSString *filename=[path stringByAppendingPathComponent:TOKEN_PLIST];   //获取路径
    NSDictionary* dic = [NSDictionary dictionaryWithContentsOfFile:filename];
    
    //3 返回数据
    return [dic objectForKey:@"access_token"];
}