【iOS

NSFileManager：是用来管理文件系统的，它可以用来进行常见的文件\文件夹操作获取NSFileManager示例[NSFileManager defaultManager]

增删改查

1. 创建文件夹

- (void)createFolder { // 获取documentsPath NSString *documentsPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0]; // 文件夹路径 NSString *folderPath = [documentsPath stringByAppendingPathComponent:@"selfFolder"]; NSError *error; BOOL temp = [[NSFileManager defaultManager] createDirectoryAtPath:folderPath withIntermediateDirectories:YES attributes:nil error:&error]; if (temp) { NSLog(@"文件夹创建成功：%@", folderPath); } else { NSLog(@"文件夹创建失败\n失败原因：%@", error); } }

2. 创建文件

- (void)createFile { // 获取documentsPath NSString *documentsPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0]; // 设置文件夹路径 NSString *folderPath = [documentsPath stringByAppendingPathComponent:@"selfFolder"]; NSString *testPath = [folderPath stringByAppendingPathComponent:@"selfFile.txt"]; BOOL temp = [[NSFileManager defaultManager] createFileAtPath:testPath contents:nil attributes:nil]; if (temp) { NSLog(@"文件创建成功：%@", testPath); } else { NSLog(@"文件创建失败"); } }

3. 向文件中写入数据

- (void)writeDataToFile { // 获取documentsPath NSString *documentsPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0]; // 文件夹路径 NSString *folderPath = [documentsPath stringByAppendingPathComponent:@"selfFolder"]; // 文件路径 NSString *filePath = [folderPath stringByAppendingPathComponent:@"selfFile.txt"]; NSString *content = @"hello world"; NSError *error; BOOL temp = [content writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:&error]; if (temp) { NSLog(@"文件写入成功：%@", filePath); } else { NSLog(@"文件写入失败\n失败原因：%@", error); } }

4. 删除文件

- (void)deleteFile { // 获取documentsPath NSString *documentsPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0]; // 文件夹路径 NSString *folderPath = [documentsPath stringByAppendingPathComponent:@"selfFolder"]; // 文件路径 NSString *filePath = [folderPath stringByAppendingPathComponent:@"selfFile.txt"]; NSError *error; BOOL temp = [[NSFileManager defaultManager] removeItemAtPath:filePath error:&error]; if (temp) { NSLog(@"文件删除成功"); } else { NSLog(@"文件删除失败\n失败原因：%@", error); } }

5. 从文件中读取数据

- (void)readFile { // 获取documentsPath NSString *documentsPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0]; // 文件夹路径 NSString *folderPath = [documentsPath stringByAppendingPathComponent:@"selfFolder"]; // 文件路径 NSString *filePath = [folderPath stringByAppendingPathComponent:@"selfFile.txt"]; // NSData *data = [NSData dataWithContentsOfFile:filePath]; NSError *error; NSString *content = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&error]; if (!error) { NSLog(@"文件读取成功：%@", content); } else { NSLog(@"文件写入失败\n失败原因：%@", error); } }

常用工具方法

1. 判断文件是否存在

[[NSFileManager defaultManager] fileExistsAtPath:filePath]

2. 判断是否为一个目录

[[NSFileManager defaultManager] fileExistsAtPath:filePath isDirectory:&isDir];

3. 判断文件是否可读

[[NSFileManager defaultManager] isReadableFileAtPath:filePath];

4. 是否可写

[[NSFileManager defaultManager] isWritableFileAtPath:filePath];

5. 是否可删除

[[NSFileManager defaultManager] isDeletableFileAtPath:filePath];

6. 获取文件属性

NSDictionary *dict = [[NSFileManager defaultManager] attributesOfItemAtPath:filePath error:nil];

7. copy文件

[[NSFileManager defaultManager] copyItemAtPath:path1 toPath:path2 error:nil];

8. 移动文件

[[NSFileManager defaultManager] moveItemAtPath:createDirPath toPath:targetPath error:nil];