从作为 NSString 的 HTML 中检索内容答案

【问题标题】：Retrieve contents from HTML which is a NSString从作为 NSString 的 HTML 中检索内容
【发布时间】：2018-09-04 15:55:20
【问题描述】：

这是我的 NSString ：

 NSString timeString = @"<h5 style="direction:ltr"><span data-version-created-date="20180326T120530.000+0000" class="releasedDate">26-Mar-2018 12:05:30</span></h5>";

我只想检索 span 标签中的“26-Mar-2018 12:05:30”。我如何在 Objective C 中做到这一点？

请注意：给定的 HTML 是 NSString 格式。

【问题讨论】：

您可以将您的 HTMLString 转换为 NSAttributedString，然后阅读 myAttributedString.string 应该会给您“26-Mar-2018 12:05:30”。否则，您可以使用NSScanner，rangeOf: 并解析它。
看看这个 - stackoverflow.com/questions/277055/…

标签： html ios objective-c nsstring

【解决方案1】：

试试这个

- (NSString *)stringByStrippingHTML : (NSString*) s {
    NSRange r;
    while ((r = [s rangeOfString:@"<[^>]+>" options:NSRegularExpressionSearch]).location != NSNotFound)
    s = [s stringByReplacingCharactersInRange:r withString:@""];
    return s;
}

【讨论】：

NSString *timeString = @"
26-Mar-2018 12:05: 30
"; NSLog([self stringByStrippingHTML:timeString]);

【解决方案2】：

这将通过去除括号 () 表达式来工作。斜线已添加 () 到 timeString 以使其正确 NSString*。剥离重复四次，bt 应该是带条件循环的。

NSString * timeString = @"<h5 style=\"direction:ltr\"><span data-version-created-date=\"20180326T120530.000+0000\" class=\"releasedDate\">26-Mar-2018 12:05:30</span></h5>";

NSRange openRange = [timeString rangeOfString:@"<"];
NSRange closeRange = [timeString rangeOfString:@">"];
NSRange enclosedRange = NSMakeRange(openRange.location, closeRange.location-openRange.location+1);
timeString = [timeString stringByReplacingCharactersInRange:enclosedRange withString:@""];

openRange = [timeString rangeOfString:@"<"];
closeRange = [timeString rangeOfString:@">"];
enclosedRange = NSMakeRange(openRange.location, closeRange.location-openRange.location+1);
timeString = [timeString stringByReplacingCharactersInRange:enclosedRange withString:@""];

openRange = [timeString rangeOfString:@"<"];
closeRange = [timeString rangeOfString:@">"];
enclosedRange = NSMakeRange(openRange.location, closeRange.location-openRange.location+1);
timeString = [timeString stringByReplacingCharactersInRange:enclosedRange withString:@""];

openRange = [timeString rangeOfString:@"<"];
closeRange = [timeString rangeOfString:@">"];
enclosedRange = NSMakeRange(openRange.location, closeRange.location-openRange.location+1);
timeString = [timeString stringByReplacingCharactersInRange:enclosedRange withString:@""];

NSLog(@"timeString = %@", timeString);

【讨论】：

【解决方案3】：

这对我有用

 NSString *timeString = @"<h5 style=\"direction:ltr\"><span data-version-created-date=\"20180326T120530.000+0000\" class=\"releasedDate\">26-Mar-2018 12:05:30</span></h5>";
  NSRegularExpression *regex = [NSRegularExpression
                              regularExpressionWithPattern:@">\\d.+\\d<"
                              options:NSRegularExpressionCaseInsensitive
                              error:NULL];
[regex enumerateMatchesInString:timeString options:0 range:NSMakeRange(0, [timeString length]) usingBlock:^(NSTextCheckingResult *match, NSMatchingFlags flags, BOOL *stop){
    // your code to handle matches here

    NSString *subString = [timeString substringWithRange:match.range];

    NSLog(@"%@",[subString substringWithRange:NSMakeRange(1, subString.length - 2)]);

}];

【讨论】：

【解决方案4】：

如果你想确保你得到跨标签之间的日期，最好比剥离所有 HTML 标签并假设唯一剩下的就是日期，或者假设只有一个更明确整个 HTML 文本中的 span 标签。它现在可能有效，但如果 HTML 发生变化，将来可能会中断。

NSString * timeString = @"<h5 style=\"direction:ltr\"><span data-version-created-date=\"20180326T120530.000+0000\" class=\"releasedDate\">26-Mar-2018 12:05:30</span><span class=\"someOtherClass\">garbageData</span></h5>";
NSRegularExpression *regex = [NSRegularExpression
                              regularExpressionWithPattern:@"<span.*class=\"releasedDate\"[^>]*>(.*)</span.*>"
                              options:NSRegularExpressionCaseInsensitive
                              error:nil];
NSTextCheckingResult *textCheckingResult = [regex firstMatchInString:timeString options:0 range:NSMakeRange(0, timeString.length)];

NSString *releaseDateString = [timeString substringWithRange:[textCheckingResult rangeAtIndex:1]];
if( ! [releaseDateString isEqualToString:@""] )
{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"dd-MMM-yyyy' 'HH:mm:ss"];
     NSDate *releaseDate = [dateFormatter dateFromString:releaseDateString];

    NSLog( @"%@ - %@", releaseDateString, releaseDate );
}

请注意，即使 HTML 文本中有其他跨度，这也有效。它专门提取了具有“releasedDate”类的那个。

【讨论】：

26-Mar-2018 12:05: 30