Objective-C 获取目录中的文件和子文件夹列表
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Objective-C get list of files and subfolders in a directory
提问by Tsukasa
What is the trick to get an array list of full file/folder paths from a given directory? I'm looking to search a given directory for files ending in .mp3 and need the full path name that includes the filename.
从给定目录获取完整文件/文件夹路径的数组列表的技巧是什么？我希望在给定目录中搜索以 .mp3 结尾的文件，并需要包含文件名的完整路径名。
NSArray* dirs = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:sourcePath error:Nil];
NSArray* mp3Files = [dirs filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"self ENDSWITH '.mp3'"]];
this only returns the file name not the path
这仅返回文件名而不是路径
回答by trojanfoe
It's probably best to enumerate the array using a block, which can be used to concatenate the path and the filename, testing for whatever file extension you want:
最好使用块枚举数组，该块可用于连接路径和文件名，测试您想要的任何文件扩展名：
NSArray* dirs = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:sourcePath
error:NULL];
NSMutableArray *mp3Files = [[NSMutableArray alloc] init];
[dirs enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSString *filename = (NSString *)obj;
NSString *extension = [[filename pathExtension] lowercaseString];
if ([extension isEqualToString:@"mp3"]) {
[mp3Files addObject:[sourcePath stringByAppendingPathComponent:filename]];
}
}];
回答by Infinity James
To use a predicate on URLs I would do it this way:
要在 URL 上使用谓词，我会这样做：
NSURL *bundleRoot = [[NSBundle mainBundle] bundleURL];
NSArray * dirContents =
[fm contentsOfDirectoryAtURL:bundleRoot
includingPropertiesForKeys:@[]
options:NSDirectoryEnumerationSkipsHiddenFiles
error:nil];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"pathExtension='.mp3'"];
NSArray *mp3Files = [directoryContents filteredArrayUsingPredicate:predicate];
This question may be a duplicate: Getting a list of files in a directory with a glob
这个问题可能是重复的：Getting a list of files in a directory with a glob
There is also the NSDirectoryEnumeratorobject which is great for iterating through files in a directory.
还有NSDirectoryEnumerator一个非常适合遍历目录中文件的对象。
