Question

是否有一种简单的方法来获取给定的文件路径并对其进行修改以避免名称冲突？类似的东西：

[StringUtils stringToAvoidNameCollisionForPath:path];

对于给定的类型路径：/foo/bar/file.png，将返回/foo/bar/file-1.png，之后它将增加“-1”，类似于Safari对下载文件所做的操作。

更新

我遵循了Ash Furrow的建议，并将我的实施作为答案发布：）

Answer 1

我遇到了类似的问题，并提出了一种稍微宽泛的方法，试图以与iTunes相同的方式命名文件（当你将它设置为管理你的库并且你有多个具有相同名称的轨道等时）。）

它在循环中工作，因此可以多次调用该函数并仍然生成有效输出。解释参数，fileName是没有路径或扩展名的文件的名称（例如“file”），folder只是路径（例如“/ foo / bar”）和{{1只是扩展名（例如“png”）。这三个可以作为一个字符串传入并在之后拆分，但在我的情况下，将它们分开是有意义的。

fileType（可以为空，但不是nil）在您重命名文件时非常有用，而不是创建新文件。例如，如果您要将“/ foo / bar / file 1.png”重命名为“/foo/bar/file.png”，则传入“/ foo / bar / file 1.png” “for currentPath，如果”/foo/bar/file.png“已经存在，你将回到你开始的路径，而不是看到”/ foo / bar / file 1.png“和返回“/ foo / bar / file 2.png”

currentPath

Answer 2

我决定实施自己的解决方案，我想分享我的代码。这不是最理想的实现，但似乎可以完成这项工作：

+ (NSString *)stringToAvoidNameCollisionForPath:(NSString *)path {

    // raise an exception for invalid paths
    if (path == nil || [path length] == 0) {
        [NSException raise:@"DMStringUtilsException" format:@"Invalid path"];
    }

    NSFileManager *manager = [[[NSFileManager alloc] init] autorelease];
    BOOL isDirectory;

    // file does not exist, so the path doesn't need to change
    if (![manager fileExistsAtPath:path isDirectory:&isDirectory]) {
        return path;
    }

    NSString *lastComponent = [path lastPathComponent];
    NSString *fileName = isDirectory ? lastComponent : [lastComponent stringByDeletingPathExtension];
    NSString *ext = isDirectory ? @"" : [NSString stringWithFormat:@".%@", [path pathExtension]];
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"-([0-9]{1,})$" options:0 error:nil];
    NSArray *matches = [regex matchesInString:fileName options:0 range:STRING_RANGE(fileName)];

    // missing suffix... start from 1 (foo-1.ext) 
    if ([matches count] == 0) {
        return [NSString stringWithFormat:@"%@-1%@", fileName, ext];
    }

    // get last match (theoretically the only one due to "$" in the regex)
    NSTextCheckingResult *result = (NSTextCheckingResult *)[matches lastObject];

    // extract suffix value
    NSUInteger counterValue = [[fileName substringWithRange:[result rangeAtIndex:1]] integerValue];

    // remove old suffix from the string
    NSString *fileNameNoSuffix = [fileName stringByReplacingCharactersInRange:[result rangeAtIndex:0] withString:@""];

    // return the path with the incremented counter suffix
    return [NSString stringWithFormat:@"%@-%i%@", fileNameNoSuffix, counterValue + 1, ext];
}

......以下是我使用的测试：

- (void)testStringToAvoidNameCollisionForPath {

    NSBundle *bundle = [NSBundle bundleForClass:[self class]];  

    // bad configs //

    STAssertThrows([DMStringUtils stringToAvoidNameCollisionForPath:nil], nil);
    STAssertThrows([DMStringUtils stringToAvoidNameCollisionForPath:@""], nil);

    // files //

    NSString *path = [bundle pathForResource:@"bar-0.abc" ofType:@"txt"];
    NSString *savePath = [DMStringUtils stringToAvoidNameCollisionForPath:path];
    STAssertEqualObjects([savePath lastPathComponent], @"bar-0.abc-1.txt", nil);

    NSString *path1 = [bundle pathForResource:@"bar1" ofType:@"txt"];
    NSString *savePath1 = [DMStringUtils stringToAvoidNameCollisionForPath:path1];
    STAssertEqualObjects([savePath1 lastPathComponent], @"bar1-1.txt", nil);

    NSString *path2 = [bundle pathForResource:@"bar51.foo.yeah1" ofType:@"txt"];
    NSString *savePath2 = [DMStringUtils stringToAvoidNameCollisionForPath:path2];
    STAssertEqualObjects([savePath2 lastPathComponent], @"bar51.foo.yeah1-1.txt", nil);

    NSString *path3 = [path1 stringByDeletingLastPathComponent];
    NSString *savePath3 = [DMStringUtils stringToAvoidNameCollisionForPath:[path3 stringByAppendingPathComponent:@"xxx.zip"]];
    STAssertEqualObjects([savePath3 lastPathComponent], @"xxx.zip", nil);

    NSString *path4 = [bundle pathForResource:@"foo.bar1-1-2-3-4" ofType:@"txt"];
    NSString *savePath4 = [DMStringUtils stringToAvoidNameCollisionForPath:path4];
    STAssertEqualObjects([savePath4 lastPathComponent], @"foo.bar1-1-2-3-5.txt", nil);

    NSString *path5 = [bundle pathForResource:@"bar1-1" ofType:@"txt"];
    NSString *savePath5 = [DMStringUtils stringToAvoidNameCollisionForPath:path5];
    STAssertEqualObjects([savePath5 lastPathComponent], @"bar1-2.txt", nil);

    // folders //

    NSString *path6 = [DOCUMENTS_PATH stringByAppendingPathComponent:@"foo1"];
    NSString *savePath6 = [DMStringUtils stringToAvoidNameCollisionForPath:path6];
    STAssertEqualObjects([savePath6 lastPathComponent], @"foo1-1", nil);

    NSString *path7 = [DOCUMENTS_PATH stringByAppendingPathComponent:@"bar1-1"];
    NSString *savePath7 = [DMStringUtils stringToAvoidNameCollisionForPath:path7];
    STAssertEqualObjects([savePath7 lastPathComponent], @"bar1-2", nil);

    NSString *path8 = [DOCUMENTS_PATH stringByAppendingPathComponent:@"foo-5.bar123"];
    NSString *savePath8 = [DMStringUtils stringToAvoidNameCollisionForPath:path8];
    STAssertEqualObjects([savePath8 lastPathComponent], @"foo-5.bar123-1", nil);

}

NSString唯一文件路径，以避免名称冲突

2 个答案: