NSString *homePath = NSHomeDirectory();

    NSArray *array = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    NSString *documentPath = [array firstObject];    NSLog(@"%@",documentPath);        //Cache目录    array = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);    NSString *cachesPath = [array firstObject];    NSLog(@"%@",cachesPath);        //Library    array = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory,NSUserDomainMask,YES);    NSString *libraryPath = [array firstObject];    NSLog(@"%@",libraryPath);        //tmp    NSString *tmpPath = NSTemporaryDirectory();    NSLog(@"%@",tmpPath);

　　 //写入数组至文件    NSArray *writeArray = @[@"张三",@"李四",@"王五"];    [writeArray writeToFile:[documentPath stringByAppendingPathComponent:@"test.txt"] atomically:YES];            //读取文件到数组    NSArray *readArray = [NSArray arrayWithContentsOfFile:[documentPath stringByAppendingPathComponent:@"test.txt"]];

　　//在Document下创建文件夹和文件    NSString *testDirectory = [documentPath stringByAppendingPathComponent:@"test"];        NSString *test1 = [testDirectory stringByAppendingPathComponent:@"test1.txt"];    NSString *test2 = [testDirectory stringByAppendingPathComponent:@"test2.txt"];    NSString *test3 = [testDirectory stringByAppendingPathComponent:@"test3.txt"];        NSFileManager *manager = [NSFileManager defaultManager];    [manager createDirectoryAtPath:testDirectory withIntermediateDirectories:YES attributes:nil error:nil];        NSString *text = @"你好,IOS";    [manager createFileAtPath:test1 contents:[text dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];    [manager createFileAtPath:test2 contents:[text dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];    [manager createFileAtPath:test3 contents:[text dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];

　　//读取所有的文件名，两种方法效果一样    NSArray *files1 = [manager subpathsAtPath:testDirectory];    NSArray *files2 = [manager subpathsOfDirectoryAtPath:testDirectory error:nil];

　　[manager changeCurrentDirectoryPath:documentPath];    NSArray *fileArray = [[NSArray alloc] initWithObjects:@"hello world",@"hello world1", @"hello world2",nil];    [manager createFileAtPath:@"testFileNSFileManager.txt" contents:fileArray attributes:nil];    [manager createFileAtPath:@"testFileNSFileManager1.txt" contents:fileArray attributes:nil];

　　[manager removeItemAtPath:@"testFileNSFileManager1.txt" error:nil];

　　//在Document下创建三个文件，将文件1全部内容和文件2部分内容复制到文件3，然后删除文件1;    NSArray *array = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    NSString *documentPath = [array firstObject];        NSFileManager *manager = [NSFileManager defaultManager];        NSString *path1 = [documentPath stringByAppendingPathComponent:@"text1.txt"];    NSString *path2 = [documentPath stringByAppendingPathComponent:@"text2.txt"];    NSString *path3 = [documentPath stringByAppendingPathComponent:@"text3.txt"];        //创建3个文件    [manager createFileAtPath:path1 contents:[@"hello from text1" dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];    [manager createFileAtPath:path2 contents:[@"hello from text2" dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];    [manager createFileAtPath:path3 contents:[@"hello from text3" dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];            //获取NSFileHandle对象    NSFileHandle *path1Handle = [NSFileHandle fileHandleForReadingAtPath:path1];    NSFileHandle *path2Handle = [NSFileHandle fileHandleForReadingAtPath:path2];    NSFileHandle *path3Handle = [NSFileHandle fileHandleForWritingAtPath:path3];            //IO读写    NSData *text1Data =http://www.mamicode.com/ [path1Handle readDataToEndOfFile];    NSData *text2Data = http://www.mamicode.com/[path2Handle readDataOfLength:5];    //将text3文件的文件指针移动到最后    [path3Handle seekToEndOfFile];        NSMutableData *data =http://www.mamicode.com/ [NSMutableData dataWithData:text1Data];    [data appendData:text2Data];    [path3Handle writeData:data];        //关闭NSFileHandle对象    [path1Handle closeFile];    [path2Handle closeFile];    [path3Handle closeFile];        //删除text1    [manager removeItemAtPath:path1 error:nil];