ios沙盒基本操作

    //对于错误信息  
    NSError *error;  
    // 创建文件管理器  
    NSFileManager *fileMgr = [NSFileManager defaultManager];  
    //指向文件目录  
    NSString *documentsDirectory= [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];  
    
    //创建一个目录  
    [[NSFileManager defaultManager]   createDirectoryAtPath: [NSString stringWithFormat:@"%@/myFolder", NSHomeDirectory()]  withIntermediateDirectories:YES attributes:nil error:&error]; 
    
    /** < 创建一个文件*/
    // File we want to create in the documents directory我们想要创建的文件将会出现在文件目录中  
    // Result is: /Documents/file1.txt结果为：/Documents/file1.txt  
    NSString *filePath= [documentsDirectory  stringByAppendingPathComponent:@"file1.txt"];  
    //需要写入的字符串  
    NSString *str= @"iPhoneDeveloper Tips\nhttp://iPhoneDevelopTips,com";  
    //写入文件  
    [str writeToFile:filePath atomically:YES   encoding:NSUTF8StringEncoding error:&error];  
    //显示文件目录的内容  
    NSLog(@"Documentsdirectory: %@", [fileMgr contentsOfDirectoryAtPath:documentsDirectory error:&error]); 
    
    /** < 对一个文件重命名*/
    //通过移动该文件对文件重命名  
    NSString *filePath2= [documentsDirectory  stringByAppendingPathComponent:@"file2.txt"];  
    //判断是否移动  
    if ([fileMgr moveItemAtPath:filePath toPath:filePath2 error:&error] != YES)  
        NSLog(@"Unable to move file: %@", [error localizedDescription]);  
    //显示文件目录的内容  
    NSLog(@"Documentsdirectory: %@",   [fileMgr contentsOfDirectoryAtPath:documentsDirectory error:&error]); 
    
    /** < 删除一个文件*/
    //在filePath2中判断是否删除这个文件  
    if ([fileMgr removeItemAtPath:filePath2 error:&error] != YES)  
        NSLog(@"Unable to delete file: %@", [error localizedDescription]);  
    //显示文件目录的内容  
    NSLog(@"Documentsdirectory: %@",  [fileMgr contentsOfDirectoryAtPath:documentsDirectory error:&error]);
    
    /** < 获取一个目录内的文件及文件夹列表*/
    NSFileManager *fileManager = [NSFileManager defaultManager];  
    //在这里获取应用程序Documents文件夹里的文件及文件夹列表  
    NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);  
    NSString *documentDir = [documentPaths objectAtIndex:0];  
    NSError *error2 = nil;  
    NSArray *fileList = [[NSArray alloc] init];  
    //fileList便是包含有该文件夹下所有文件的文件名及文件夹名的数组  
    fileList = [fileManager contentsOfDirectoryAtPath:documentDir error:&error2];
    
    
    /** < 列出给定一个文件夹里的所有子文件夹名*/
    NSMutableArray *dirArray = [[NSMutableArray alloc] init];  
    BOOL isDir = NO;  
    //在上面那段程序中获得的fileList中列出文件夹名  
    for (NSString *file in fileList) {  
        NSString *path = [documentDir stringByAppendingPathComponent:file];  
        [fileManager fileExistsAtPath:path isDirectory:(&isDir)];  
        if (isDir) {  
            [dirArray addObject:file];  
        }  
        isDir = NO;  
    }  
    NSLog(@"Every Thing in the dir:%@",fileList);  
    NSLog(@"All folders:%@",dirArray);