从文档目录ios获取文件名的文件路径 [英] Get file path by file name from documents directory ios

问题描述

在我的应用程序中，我下载PDF文件，该文件存储在不同子文件夹下的Document目录中。

In my application I download PDF files which gets stored in "Document" directory under different sub folders.

现在我有文件名，我想在文档目录中获取其路径，但问题是我不知道该文件所属的确切子文件夹存储。

Now I have file name for which I want to get its path in "Document" directory but problem is I don't know the exact sub folder under which that file is stored.

那么有没有什么方法可以给我文件路径按文件名，就像有一种方法适用于主包：

So is there any method which will give me file path by file's name like there is one method which works for main bundle:

(NSString *)pathForResource:(NSString *)name ofType:(NSString *)extension

我不想遍历每个文件夹，这是一种繁琐的方式。

I don't want to iterate through each folder which is a tedious way.

谢谢。

推荐答案

您可以搜索文档目录，如下所示：

You can search the documents directory like this:

NSString *searchFilename = @"hello.pdf"; // name of the PDF you are searching for

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSDirectoryEnumerator *direnum = [[NSFileManager defaultManager] enumeratorAtPath:documentsDirectory];

NSString *documentsSubpath;
while (documentsSubpath = [direnum nextObject])
{
  if (![documentsSubpath.lastPathComponent isEqual:searchFilename]) {
    continue;
  }

  NSLog(@"found %@", documentsSubpath);
}

编辑：

您也可以使用NSPredicate。如果文档目录中有数千个文件，则可能会因内存不足错误而崩溃。

You can also use NSPredicate. If there are many thousands of files in the documents directory, this might crash with an out of memory error.

NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"self.lastPathComponent == %@", searchFilename];
NSArray *matchingPaths = [[[NSFileManager defaultManager] subpathsAtPath:documentsDirectory] filteredArrayUsingPredicate:predicate];

NSLog(@"%@", matchingPaths);

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