iOS 关于文件操作 NSFileManager

• 创建文件夹

  + (BOOL)creatDir:(NSString *)path {
      if (path.length==0) {
          return NO;
      }
      NSFileManager *fileManager = [NSFileManager defaultManager];
      BOOL isSuccess = YES;
      BOOL isExist = [fileManager fileExistsAtPath:path];
      if (isExist==NO) {
          NSError *error;
          if (![fileManager createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:&error]) {
              isSuccess = NO;
              NSLog(@"creat Directory Failed:%@",[error localizedDescription]);
          }
      }
      return isSuccess;
  }
  

  　　

• 创建文件

  + (BOOL)creatFile:(NSString*)filePath {
      if (filePath.length==0) {
          return NO;
      }
      NSFileManager *fileManager = [NSFileManager defaultManager];
      if ([fileManager fileExistsAtPath:filePath]) {
          return YES;
      }
      NSError *error;
      NSString *dirPath = [filePath stringByDeletingLastPathComponent];
      BOOL isSuccess = [fileManager createDirectoryAtPath:dirPath withIntermediateDirectories:YES attributes:nil error:&error];
      if (error) {
          NSLog(@"creat File Failed:%@",[error localizedDescription]);
      }
      if (!isSuccess) {
          return isSuccess;
      }
      isSuccess = [fileManager createFileAtPath:filePath contents:nil attributes:nil];
      return isSuccess;
  }
  

  　　

• 写入文件

  + (BOOL)writeToFile:(NSString*)filePath contents:(NSData *)data {
      if (filePath.length==0) {
          return NO;
      }
      BOOL result = [self creatFile:filePath];
      if (result) {
          if ([data writeToFile:filePath atomically:YES]) {
              NSLog(@"write Success");
          }else{
              NSLog(@"write Failed");
          }
      }
      else{
          NSLog(@"write Failed");
      }
      return result;
  }
  

  　　

• 追加数据

  + (BOOL)appendData:(NSData*)data withPath:(NSString *)filePath {
      if (filePath.length==0) {
          return NO;
      }
      BOOL result = [self creatFile:filePath];
      if (result) {
          NSFileHandle *handle = [NSFileHandle fileHandleForWritingAtPath:filePath];
          [handle seekToEndOfFile];
          [handle writeData:data];
          [handle synchronizeFile];
          [handle closeFile];
      }
      else{
          NSLog(@"appendData Failed");
      }
      return result;
  }