使用 glob 获取目录中的文件列表 [英] Getting a list of files in a directory with a glob

问题描述

出于某种疯狂的原因，我找不到一种方法来获取包含给定目录的 glob 的文件列表.

For some crazy reason I can't find a way to get a list of files with a glob for a given directory.

我目前被困在以下方面:

I'm currently stuck with something along the lines of:

NSString *bundleRoot = [[NSBundle mainBundle] bundlePath];
NSArray *dirContents = [[NSFileManager defaultManager] 
                        directoryContentsAtPath:bundleRoot];

..然后去掉我不想要的东西，这很糟糕.但我真正想要的是能够搜索诸如foo*.jpg"之类的内容，而不是请求整个目录，但我找不到类似的内容.

..and then stripping out the stuff I don't want, which sucks. But what I'd really like is to be able to search for something like "foo*.jpg" instead of asking for the entire directory, but I've not been able to find anything like that.

那你是怎么做到的?

推荐答案

在 NSPredicate 的帮助下，您可以很容易地实现这一点，如下所示:

You can achieve this pretty easily with the help of NSPredicate, like so:

NSString *bundleRoot = [[NSBundle mainBundle] bundlePath];
NSFileManager *fm = [NSFileManager defaultManager];
NSArray *dirContents = [fm contentsOfDirectoryAtPath:bundleRoot error:nil];
NSPredicate *fltr = [NSPredicate predicateWithFormat:@"self ENDSWITH '.jpg'"];
NSArray *onlyJPGs = [dirContents filteredArrayUsingPredicate:fltr];

如果你需要用 NSURL 来代替，它看起来像这样:

If you need to do it with NSURL instead it looks like this:

NSURL *bundleRoot = [[NSBundle mainBundle] bundleURL];
NSArray * dirContents = 
      [fm contentsOfDirectoryAtURL:bundleRoot
        includingPropertiesForKeys:@[] 
                           options:NSDirectoryEnumerationSkipsHiddenFiles
                             error:nil];
NSPredicate * fltr = [NSPredicate predicateWithFormat:@"pathExtension='jpg'"];
NSArray * onlyJPGs = [dirContents filteredArrayUsingPredicate:fltr];

这篇关于使用 glob 获取目录中的文件列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！