NSFileManager

此篇是关于NSFileManager如何使用.包括创建文件,目录.删除文件等操作

获取Documents路径

<pre>- (NSString *)getDocumentsPath { //获取Documents路径 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *path = [paths objectAtIndex:0]; NSLog(@"path:%@", path); return path; }</pre>

在Documents里创建目录

<pre>NSString *filePath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]; NSLog(@"%@",filePath); NSFileManager *fileManager = [NSFileManager defaultManager]; NSString *fooDirectory = [filePath stringByAppendingPathComponent:@"foo"]; [fileManager createDirectoryAtPath:fooDirectory withIntermediateDirectories:YES attributes:nil error:nil];</pre>

在foo目录中创建文件,并写入内容

<pre>`
NSString *filePath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
NSLog(@"%@",filePath);
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *fooDirectory = [filePath stringByAppendingPathComponent:@"fuck"];
[fileManager createDirectoryAtPath:fooDirectory withIntermediateDirectories:YES attributes:nil error:nil];
NSString *filePathOftest = [fooDirectory stringByAppendingPathComponent:@"haha001.txt"];

NSString *str = @"write something";
[fileManager createFileAtPath:filePathOftest contents:[str dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];

`</pre>

获取文件夹里面所有文件名

<pre>NSString *filePath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]; NSLog(@"%@",filePath); NSFileManager *fileManager = [NSFileManager defaultManager]; NSString *fooDirectory = [filePath stringByAppendingPathComponent:@"fuck"]; NSArray *files = [fileManage subpathsAtPath: fooDirectory ];</pre>

判断文件是否存在

<pre>`

• (BOOL)isSxistAtPath:(NSString *)filePath{
  NSFileManager *fileManager = [NSFileManager defaultManager];
  BOOL isExist = [fileManager fileExistsAtPath:filePath];
  return isExist;
  }
  `</pre>

计算文件大小

<pre>- (unsigned long long)fileSizeAtPath:(NSString *)filePath{ NSFileManager *fileManager = [NSFileManager defaultManager]; BOOL isExist = [fileManager fileExistsAtPath:filePath]; if (isExist){ unsigned long long fileSize = [[fileManager attributesOfItemAtPath:filePath error:nil] fileSize]; return fileSize; } else { NSLog(@"file is not exist"); return 0; } }</pre>

计算文件夹大小

<pre>`

• (unsigned long long)folderSizeAtPath:(NSString*)folderPath{
  NSFileManager *fileManager = [NSFileManager defaultManager];
  BOOL isExist = [fileManager fileExistsAtPath:folderPath];
  if (isExist){
  NSEnumerator *childFileEnumerator = [[fileManager subpathsAtPath:folderPath] objectEnumerator];
  unsigned long long folderSize = 0;
  NSString fileName = @"";
  while ((fileName = [childFileEnumerator nextObject]) != nil){
  NSString fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];
  folderSize += [self fileSizeAtPath:fileAbsolutePath];
  }
  return folderSize / (1024.0 * 1024.0);
  } else {
  NSLog(@"file is not exist");
  return 0;
  }
  }
  `</pre>

删除文件

<pre>-(void)deleteFile{ NSString *documentsPath =[self getDocumentsPath]; NSFileManager *fileManager = [NSFileManager defaultManager]; NSString *iOSPath = [documentsPath stringByAppendingPathComponent:@"foo.txt"]; BOOL isSuccess = [fileManager removeItemAtPath:iOSPath error:nil]; if (isSuccess) { NSLog(@"delete success"); }else{ NSLog(@"delete fail"); } }</pre>

移动文件

<pre>- (void)moveFileName { NSString *documentsPath =[self getDocumentsPath]; NSFileManager *fileManager = [NSFileManager defaultManager]; NSString *filePath = [documentsPath stringByAppendingPathComponent:@"foo.txt"]; NSString *moveToPath = [documentsPath stringByAppendingPathComponent:@"foof.txt"]; BOOL isSuccess = [fileManager moveItemAtPath:filePath toPath:moveToPath error:nil]; if (isSuccess) { NSLog(@"rename success"); }else{ NSLog(@"rename fail"); } }</pre>

重命名

<pre>- (void)renameFileName { //通过移动该文件对文件重命名 NSString *documentsPath =[self getDocumentsPath]; NSFileManager *fileManager = [NSFileManager defaultManager]; NSString *filePath = [documentsPath stringByAppendingPathComponent:@"foo.txt"]; NSString *moveToPath = [documentsPath stringByAppendingPathComponent:@"rename.txt"]; BOOL isSuccess = [fileManager moveItemAtPath:filePath toPath:moveToPath error:nil]; if (isSuccess) { NSLog(@"rename success"); }else{ NSLog(@"rename fail"); } }</pre>