通过空行将 NSString 拆分为 NSArray

发布于 2024-12-28 09:01:12 字数 588 浏览 3 评论 0原文

我正在将 *.srt 字幕文件读入 NSString 中。该字符串的内容如下所示：

1
00:00:20,000 --> 00:00:24,400
Altocumulus clouds occur between six thousand

2
00:00:24,600 --> 00:00:27,800
and twenty thousand feet above ground level.

我正在寻找一种优雅的解决方案来将该字符串拆分为 NSArray，其中每个元素都包含与一个特定字幕“frame”相关的信息，例如第零个元素如下所示：

1
00:00:20,000 --> 00:00:24,400
Altocumulus clouds occur between six thousand

有什么想法可以优雅地完成这项任务吗？我尝试使用该方法拆分原始字符串

[string componentsSeparatedByString:@"\n\n"];

，但该方法无法检测空行..

感谢您的帮助！

托比

原文

I am reading a *.srt subtitle file into a NSString. The content of this string looks like this:

1
00:00:20,000 --> 00:00:24,400
Altocumulus clouds occur between six thousand

2
00:00:24,600 --> 00:00:27,800
and twenty thousand feet above ground level.

I am looking for an elegant solution to split this string into an NSArray in which each element contains the information which is related to one particular subtitle-"frame", e.g. the zeroth element would look like this:

1
00:00:20,000 --> 00:00:24,400
Altocumulus clouds occur between six thousand

Any ideas how to accomplish this task in an elegant manner? I tried splitting the original string using the method

[string componentsSeparatedByString:@"\n\n"];

but this method fails to detect the blank lines..

Thanks for your help!

tobi

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戈亓 2025-01-04 09:01:13

如果 [string ComponentsSeparatedByString:@"\n\n"] 不起作用，则有两种可能：

您的文件包含 MSDOS 样式的换行符，即 \r \n。因此，请尝试在 @"\r\n\r\n" 上进行拆分。
您所谓的空白行包含空格或制表符。您可以使用 cat -e 从 shell 进行检查。

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唠甜嗑 2025-01-04 09:01:13

我建议使用 NSScanner 代替。它更加灵活，您不必担心换行符是 Windows 还是 Unix 样式以及空行是否包含空格。这是一个例子：

NSMutableArray *lines = [NSMutableArray array];
NSString *s = @"foo\n\nbar\r\n  \t  \r\nbaz"; //intentionally mixed line breaks
NSScanner *scanner = [NSScanner scannerWithString:s];
while (![scanner isAtEnd]) {
    [scanner scanCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:NULL];
    NSString *line = nil;
    [scanner scanUpToCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:&line];
    if (line) {
        [lines addObject:line];
    }
}
NSLog(@"%@", lines);

I'd suggest using NSScanner instead. It's more flexible and you don't have to worry about whether your line breaks are Windows or Unix style and whether the blank lines contain any spaces. Here's an example:

NSMutableArray *lines = [NSMutableArray array];
NSString *s = @"foo\n\nbar\r\n  \t  \r\nbaz"; //intentionally mixed line breaks
NSScanner *scanner = [NSScanner scannerWithString:s];
while (![scanner isAtEnd]) {
    [scanner scanCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:NULL];
    NSString *line = nil;
    [scanner scanUpToCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:&line];
    if (line) {
        [lines addObject:line];
    }
}
NSLog(@"%@", lines);

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