ios - 在Swift中使用NSRegularExpression在特定范围内为单词赋予属性

Question

我有一些纯HTML字符串，其中一些带有标题标签<b>Title</b>。

facilities: "<b>Facilities</b><br/>24-hour security, Barbecue area, Car park, Clubhouse, Function room, Gym, Outdoor swimming pool, Playground, Swimming pool<br/><br/><b>Rooms</b><br/>Dining room, Ensuites, Living room, Maid\'s room, Utility room<br/><br/><b>Outdoor</b><br/>Balcony<br/><br/><b>View</b><br/>City, Open<br/><br/><b>Direction</b><br/>South East"

因此，我使用 NSRegularExpression模式从字符串中提取标题并将其存储在字符串数组中。然后，我将这些标题设为 粗体(归因字符串)并显示。所以这就是我这样做的方式:

var titlesArray = [String]()
let regex = try! NSRegularExpression(pattern: "<b>(.*?)</b>", options: [])
let basicDescription = facilities as NSString

regex.enumerateMatchesInString(facilities, options: [], range: NSMakeRange(0, facilities.characters.count)) { result, flags, stop in
  if let range = result?.rangeAtIndex(1) {
    titlesArray.append(basicDescription.substringWithRange(range))
  }
}

let convertedDescription = facilities.html2String as NSString
let attributedString = NSMutableAttributedString(string: convertedDescription as String, attributes: [NSFontAttributeName:UIFont.systemFontOfSize(14.0)])
let boldFontAttribute = [NSFontAttributeName: UIFont.boldSystemFontOfSize(15.0)]

if titlesArray.count > 0 {
   for i in 0..<titlesArray.count {
   attributedString.addAttributes(boldFontAttribute, range: convertedDescription.rangeOfString(titlesArray[i]))
   } 
}

所以，一切都很好。但是问题是，有时我会收到带有Html标记的字符串，其中包含重复的单词，其中一个是带有标题标签的title，另一个只是一个简单的单词，我不需要加粗。但是此函数将查找该单词并将其在for循环内加粗，并忽略该简单单词后面的真实标题。

这就是我得到的:



因此，在这里，我该如何忽略第一个“室外”，并加粗我想要的第二个“室外”。感谢您的任何帮助。

Answer 1

在Objective-C中，在Swift中进行翻译应该不难(因为您似乎已经知道其中一些方法)。
attr1用init(data:, options:, documentAttributes:)呈现。我没有添加任何其他效果(例如，粗体/标准，颜色的首选大小，您只需要枚举并更改效果)attr2的呈现方式与您使用正则表达式所需的方式相同。它只是不考虑所有标记，仅考虑粗体，而且我几乎没有编码新行的替换(<br/>到\n)。但这可能是要使用的东西。我没有对您的正则表达式进行更多测试(while循环可能卡住了？)

NSString *str = @"<b>Facilities</b><br/>24-hour security, Barbecue area, Car park, Clubhouse, Function room, Gym, Outdoor swimming pool, Playground, Swimming pool<br/><br/><b>Rooms</b><br/>Dining room, Ensuites, Living room, Maid\'s room, Utility room<br/><br/><b>Outdoor</b><br/>Balcony<br/><br/><b>View</b><br/>City, Open<br/><br/><b>Direction</b><br/>South East";

NSError *errorAttr1 = nil;
NSAttributedString *attr1 = [[NSAttributedString alloc] initWithData:[str dataUsingEncoding:NSUTF8StringEncoding] options:@{NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType} documentAttributes:nil error:&errorAttr1];
if (errorAttr1)
{
    NSLog(@"Error AttributedStr Conversion with initWithData:options:documentsAttributes:error: %@", errorAttr1);
}
else
{
    NSLog(@"attr1: %@", attr1);
    [_tv1 setAttributedText:attr1];

}

str = [str stringByReplacingOccurrencesOfString:@"<br/>" withString:@"\n"];

NSError *errorRegex = nil;
NSString *openingTag = @"<b>";
NSString *closingTag = @"</b>";
NSString *pattern = [NSString stringWithFormat:@"%@(.*?)%@", openingTag, closingTag];
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:pattern options:0 error:&errorRegex];
if (errorRegex)
{
    NSLog(@"Error regex: %@", errorRegex);
    return;
}


NSDictionary *boldAttributes = @{NSForegroundColorAttributeName:[UIColor darkGrayColor],
                                 NSFontAttributeName:[UIFont boldSystemFontOfSize:15]};
NSDictionary *normalAttributes = @{NSForegroundColorAttributeName:[UIColor darkGrayColor],
                                   NSFontAttributeName:[UIFont systemFontOfSize:14]};

NSMutableAttributedString *attr2 = [[NSMutableAttributedString alloc] initWithString:str attributes:normalAttributes]; //Add the initial attributes there

//Now we'll add the specific attribues
NSTextCheckingResult *match = [regex firstMatchInString:[attr2 string] options:0 range:NSMakeRange(0, [attr2 length])];
while (match)
{
    NSRange range = [match range];
    NSString *foundStr = [[attr2 string] substringWithRange:range];
    NSAttributedString *temp = [[NSAttributedString alloc] initWithString:[foundStr substringWithRange:NSMakeRange([openingTag length], [foundStr length]-[openingTag length]-[closingTag length])] attributes:boldAttributes];
    [attr2 replaceCharactersInRange:range withAttributedString:temp];
    match = [regex firstMatchInString:[attr2 string] options:0 range:NSMakeRange(0, [attr2 length])];
}
NSLog(@"attr2: %@", attr2);
[_tv2 setAttributedText:attr2];

_tv1和 _tv2是两个 UITextView( IBOulet)。
它呈现:( _tv1是最上面的一个， _tv2是第二个)。