NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);  NSString *documentsDirectory = [paths objectAtIndex:0];  NSLog(@"documentsDirectory%@",documentsDirectory);  NSFileManager *fileManager = [NSFileManager defaultManager];  NSString *testDirectory = [documentsDirectory stringByAppendingPathComponent:@"test"];  // 创建目录[fileManager createDirectoryAtPath:testDirectory withIntermediateDirectories:YES attributes:nil error:nil];

NSString *testPath = [testDirectory stringByAppendingPathComponent:@"test00.txt"];
NSString *testPath2 = [testDirectory stringByAppendingPathComponent:@"test22.txt"];
NSString *testPath3 = [testDirectory stringByAppendingPathComponent:@"test33.txt"];  NSString *string = @"写入内容，write String";
[fileManager createFileAtPath:testPath contents:[string  dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];
[fileManager createFileAtPath:testPath2 contents:[string  dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];
[fileManager createFileAtPath:testPath3 contents:[string  dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);  NSString *documentsDirectory = [paths objectAtIndex:0];  NSLog(@"documentsDirectory%@",documentsDirectory);  NSFileManager *fileManage = [NSFileManager defaultManager];  NSString *myDirectory = [documentsDirectory stringByAppendingPathComponent:@"test"];  NSArray *file = [fileManage subpathsOfDirectoryAtPath: myDirectory error:nil]; NSLog(@"%@",file);  NSArray *files = [fileManage subpathsAtPath: myDirectory ]; NSLog(@"%@",files); 

2012-06-17 23:23:19.684 IosSandbox[947:f803] fileList:(".DS_Store","test00.txt","test22.txt","test33.txt"
)
2012-06-17 23:23:19.686 IosSandbox[947:f803] fileLit(".DS_Store","test00.txt","test22.txt","test33.txt"
)

//创建文件管理器NSFileManager *fileManager = [NSFileManager defaultManager];NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);NSString *documentsDirectory = [paths objectAtIndex:0];//更改到待操作的目录下[fileManager changeCurrentDirectoryPath:[documentsDirectory stringByExpandingTildeInPath]];//创建文件fileName文件名称，contents文件的内容，如果开始没有内容可以设置为nil，attributes文件的属性，初始为nilNSString * fileName = @"testFileNSFileManager.txt";NSArray *array = [[NSArray alloc] initWithObjects:@"hello world",@"hello world1", @"hello world2",nil];[fileManager createFileAtPath:fileName contents:array attributes:nil];

    NSString * fileName = @"testFileNSFileManager.txt";NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);NSString *documentsDirectory = [paths objectAtIndex:0];//获取文件路径NSString *path = [documentsDirectory stringByAppendingPathComponent:fileName];//待写入的数据NSString *temp = @"nihao 世界";int dataInt = 1234;float dataFloat = 3.14f;//创建数据缓冲NSMutableData *writer = [[NSMutableData alloc] init];//将字符串添加到缓冲中[writer appendData:[temp dataUsingEncoding:NSUTF8StringEncoding]];   //将其他数据添加到缓冲中[writer appendBytes:&dataInt length:sizeof(dataInt)];[writer appendBytes:&dataFloat length:sizeof(dataFloat)];  //将缓冲的数据写入到文件中[writer writeToFile:path atomically:YES]; 

 //读取数据：int intData;float floatData = 0.0;NSString *stringData;NSData *reader = [NSData dataWithContentsOfFile:path];stringData = [[NSString alloc] initWithData:[reader subdataWithRange:NSMakeRange(0, [temp length])]encoding:NSUTF8StringEncoding];[reader getBytes:&intData range:NSMakeRange([temp length], sizeof(intData))];[reader getBytes:&floatData range:NSMakeRange([temp length] + sizeof(intData), sizeof(floatData))];NSLog(@"stringData:%@ intData:%d floatData:%f", stringData, intData, floatData);