Question

我在nsdocumentdirectory中有一些文件，当我获取这些文件时，它返回带有随机位置的文件。我正在使用以下代码：

NSString *downloadDirectory = [Utility bookDownloadFolder];
NSString *bookFolder = [[_selectedBook.zipFile lastPathComponent] stringByDeletingPathExtension];
NSString *bookFolderFinal = [downloadDirectory stringByAppendingPathComponent:bookFolder];
NSMutableArray *retval = [NSMutableArray array];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error = nil;
NSArray *files = [fileManager contentsOfDirectoryAtPath:bookFolderFinal error:&error];

，输出如下：

文件（＆＃34; 1.JPG＆＃34;＆＃34;的1.txt＆＃34;＆＃34; 10.JPG＆＃34;＆＃34; 10.txt＆＃34;＆＃ 34; 11.JPG＆＃34;＆＃34; 11.txt＆＃34;＆＃34; 12.JPG＆＃34;＆＃34; 12.txt＆＃34;＆＃34; 13.jpg＆＃ 34;，＆＃34; 13.txt＆＃34;，＆＃34; 2.jpg＆＃34;，＆＃34; 2.txt＆＃34;，＆＃34; 3.jpg＆＃34;，＆＃34 ; 3.txt＆＃34;＆＃34; 4.JPG＆＃34;＆＃34; 4.txt＆＃34;＆＃34; 5.JPG＆＃34;＆＃34; 5.txt＆＃34 ;，＆＃34; 6.jpg＆＃34;，＆＃34; 6.txt＆＃34;＆＃34; 7.jpg＆＃34;，＆＃34; 7.txt＆＃34;，＆＃34; __ MACOSX＆＃34; ）

但我希望输出按升序排列如下：文件（＆＃34; 1.jpg＆＃34;，＆＃34; 1.txt＆＃34;，＆＃34; 2.jpg＆＃34;，＆＃ 34; 2.txt＆＃34;，）

如果我使用localizedCaseInsensitiveCompare对数组进行排序，那么在这种情况下它不起作用，如果我使用localizedCaseInsensitiveCompare那么输出就是这样的。（＆＃34; __ MACOSX＆＃34;，＆＃34; 1.jpg＆＃ 34;，＆＃34; 1.txt＆＃34;，＆＃34; 10.jpg＆＃34;，＆＃34; 10.txt＆＃34;，＆＃34; 11.jpg＆＃34;，＆＃34 ; 11.txt＆＃34;，＆＃34; 12.jpg＆＃34;，＆＃34; 12.txt＆＃34;，＆＃34; 13.jpg＆＃34;，＆＃34; 13.txt＆＃34 ;，＆＃34; 2.jpg＆＃34;，＆＃34; 2.txt＆＃34;，＆＃34; 3.jpg＆＃34;，＆＃34; 3.txt＆＃34;，＆＃34; 4.jpg＆＃34;，＆＃34; 4.txt＆＃34;，＆＃34; 5.jpg＆＃34;，）

Answer 1

解决问题的Swift示例：

let testArray = ["1.jpg","1.txt","10.jpg","10.txt","11.jpg","11.txt","12.jpg","12.txt","13.jpg","13.txt","2.jpg","2.txt", "3.jpg","3.txt","4.jpg","4.txt","5.jpg","5.txt","6.jpg","6.txt", "7.jpg","7.txt"]

let sortedArray = testArray.sort({ x, y in
    return x.localizedStandardCompare(y) == NSComparisonResult.OrderedAscending
})


print(sortedArray)
//"["1.jpg", "1.txt", "2.jpg", "2.txt", "3.jpg", "3.txt", "4.jpg", "4.txt", "5.jpg", "5.txt", "6.jpg", "6.txt", "7.jpg", "7.txt", "10.jpg", "10.txt", "11.jpg", "11.txt", "12.jpg", "12.txt", "13.jpg", "13.txt"]

Answer 2

[NSSortDescriptor sortDescriptorWithKey:@"self" 
ascending:YEScomparator:^(NSString * string1, NSString * string2){ 
return [string1 compare:string2 options:NSNumericSearch]; 
}];

Answer 3

为Swift 4扩展和更新Oleg的答案：

contentsOfDirectory(at:)的文档指出返回的网址的顺序是“未定义的”。我不确定很多开发人员是否期望这样，但无论如何......

第一项工作是获取文件URL：

let maybeURLs = try? FileManager.default.contentsOfDirectory(
        at: rootURL,
        includingPropertiesForKeys: [.isDirectoryKey],
        options: [.skipsSubdirectoryDescendants, .skipsHiddenFiles])

guard let urls = maybeURLs else { return }

现在我们必须像Finder那样对URL进行排序。

在这种情况下，由于我们知道所有文件都属于同一目录，我们只能使用lastPathComponent进行比较（幸运的是，这是一个字符串。）

您可以扩展比较逻辑以忽略后缀（.txt vs .jpg）等。

let sortedURLs = urls.sorted { a, b in
    return a.lastPathComponent
        .localizedStandardCompare(b.lastPathComponent)
            == ComparisonResult.orderedAscending
}

打印结果：

sortedURLs.forEach { print($0.lastPathComponent) }

1 Foo.txt
10 Bar.txt
100 Baz.txt
200 Boo.txt
210 Moo.txt

Answer 4

NSMutableArray * myArray = [NSMutableArray arrayWithObjects：@“4”，@“2”，@“7”，@“8”，nil]; //排序[myArray sortUsingComparator：^ NSComparisonResult（NSString * str1，NSString * str2）{return [str1 compare：str2 options：（NSNumericSearch）]; }]; //记录NSLog（@“％@”，myArray）;

如何按名称从nsdocumentdirectory中对文件进行排序？

4 个答案: