ios filemanager 对文件的操作

//创建目录
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDir = [paths objectAtIndex:0];
    NSFileManager *filemanager = [NSFileManager defaultManager];
    NSString *newDir = [documentsDir stringByAppendingPathComponent:@"newdirName"];
    BOOL ok = [filemanager createDirectoryAtPath:newDir attributes:nil];
    //NSLog(@"创建目录newdirName是否成功:%@",ok);
    //取得一个目录下所有文件名
    NSArray *files = [filemanager subpathsOfDirectoryAtPath:newDir error:nil];
    //或者
    NSArray *filearr = [filemanager subpathsAtPath:newDir];
    //nslog
    NSLog(@"%@",files);
    //在一个指定目录下创建文件
    NSString *newfilepath = [newDir stringByAppendingPathComponent:@"file11.txt"];
    NSString *temptxt = @"temp txt content ";
    NSError *err;
    [temptxt writeToFile:newfilepath atomically:YES encoding:NSUTF8StringEncoding error:&err];
    //显示创建的目录下包含的内容
    NSLog(@"新建文件路径是:%@",newfilepath);
    NSLog(@"显示在指定目录下创建的文件的内容:%@",[filemanager contentsOfDirectoryAtPath:documentsDir error:&err]);
    //如何读取创建的文件比如txt?
    
    //对文件进行重命名,ios里重名命是通过移动文件进行操作的
    NSString *src = newfilepath;
    NSString *dst = [newDir stringByAppendingPathComponent:@"rename.txt"];
    BOOL flag = [filemanager moveItemAtPath:src toPath:dst error:nil];
    if(flag)
    {
        NSLog(@"rename ok");
    }
    else {
        NSLog(@"rename fail");
    }
    
    //删除文件
    if([filemanager removeItemAtPath:dst error:&err]!=YES)
    {
        NSLog(@"unable delete because:%@",[err localizedDescription]);
    }
    NSLog(@"%@",[filemanager contentsOfDirectoryAtPath:newDir error:&err]);//文件的删除跟文件夹没有关系