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

由于一些疯狂的原因，我找不到一个方法来获取一个给定目录的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.

我目前被卡住了沿着以下行：

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

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

..然后剥离出我不想要的东西，这很烂。但我真正想要的是能够搜索像foo * .jpg而不是整个目录，但我没有能够找到这样的东西。

..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.

那么你怎么做呢？

推荐答案

帮助NSPredicate，像这样：

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];

如果你需要使用NSURL，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];

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