文件管理器 NSFileManager
1 #pragma mark - 文件管理器 创建文件夹 2 3 // 创建对象 4 NSFileManager *manager = [NSFileManager defaultManager]; 5 6 // 创建路径 7 NSString *path = NSHomeDirectory(); 8 path = [path stringByAppendingPathComponent:@"test/myApp"]; 9 NSLog(@"%@", path); 10 11 // 创建 12 NSError *error = nil; 13 BOOL success = [manager createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:&error]; 14 NSLog(@"success = %d, error = %@", success, error); 15 16 17 #pragma mark - 文件管理器 添加内容 18 // 添加字符串 19 path = [path stringByAppendingPathComponent:@"hhh.txt"]; 20 21 // 初始化字符串 22 NSString *string = @"哈哈哈哈"; 23 24 [string writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:nil]; 25 26 27 #pragma mark - 文件管理器 删除内容 28 [manager removeItemAtPath:path error:nil]; 29 30 31 #pragma mark - 文件管理器 移动，copy 32 // 找到Documents路径 33 NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; 34 35 36 // 创建一个文件夹 37 NSString *copyPath = [documentPath stringByAppendingPathComponent:@"备份/test.txt"]; 38 39 // stringByDeletingLastPathComponent删除最后一部分内容 40 [manager createDirectoryAtPath:[copyPath stringByDeletingLastPathComponent] withIntermediateDirectories:YES attributes:nil error:nil]; 41 42 // 定义一个字符串 43 NSString *testStr = @"哈哈哈"; 44 NSData *data = [testStr dataUsingEncoding:NSUTF8StringEncoding]; 45 46 [manager createFileAtPath:copyPath contents:data attributes:nil]; 47 48 49 // 创建一个toPath[用来移动] 50 NSString *toPath = [documentPath stringByAppendingPathComponent:@"hello/aaa.txt"]; 51 52 [manager createDirectoryAtPath:[toPath stringByDeletingLastPathComponent] withIntermediateDirectories:YES attributes:nil error:nil]; 53 54 NSError *error1 = nil; 55 BOOL result = [manager moveItemAtPath:copyPath toPath:toPath error:&error1]; 56 NSLog(@"result = %d, error1 = %@", result, error1); 57 58 59 BOOL result1 = [manager copyItemAtPath:copyPath toPath:toPath error:nil]; 60 NSLog(@"%d", result1);
文件对接器 NSFileHandle
1 #pragma mark - 使用NSFileManager创建文件夹 2 NSFileManager *fileManager = [NSFileManager defaultManager]; 3 4 NSString *documentPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; 5 NSString *strPath = [documentPath stringByAppendingPathComponent:@"file.txt"]; 6 7 [fileManager createFileAtPath:strPath contents:[@"hello" dataUsingEncoding:NSUTF8StringEncoding] attributes:nil]; 8 NSLog(@"%@", strPath); 9 10 11 #pragma mark - 使用NSFileHandle向文件里追加内容 12 // 创建handle对象 13 NSFileHandle *fileHandle = [NSFileHandle fileHandleForUpdatingAtPath:strPath]; 14 15 // 搜索到文本内容末尾 16 [fileHandle seekToEndOfFile]; 17 18 19 // 创建数据 20 NSString *appendStr = @"我是新添加的"; 21 NSData *data1 = [appendStr dataUsingEncoding:NSUTF8StringEncoding]; 22 23 // 将数据写入对接器 24 [fileHandle writeData:data1]; 25 26 // 关闭对接器 27 [fileHandle closeFile]; 28 29 30 #pragma mark - 定位数据 31 32 //将“123456”写入file2.txt文件夹中 33 NSString * content = @"123456"; 34 NSString * filePath2 = [documentPath stringByAppendingPathComponent:@"file2.txt"]; 35 [fileManager createFileAtPath:filePath2 contents:[content dataUsingEncoding:NSUTF8StringEncoding] attributes:nil]; 36 37 //通过fileHandle读取 38 fileHandle = [NSFileHandle fileHandleForReadingAtPath:filePath2]; 39 // 获取数据长度 40 NSUInteger length = [[fileHandle availableData] length]; 41 // 偏移量文件的一半 42 [fileHandle seekToFileOffset:length/2.0]; 43 //从一半位置读取到最后 44 NSData * data = [fileHandle readDataToEndOfFile]; 45 [fileHandle closeFile]; 46 //打印读取的字符串 47 NSString * string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; 48 NSLog(@"%@",string);