匹配<a>字符串中的錨標記，提取他們的`href`

Question

我想將字符串中的所有標記鏈接到它們各自的href，以便它可以在瀏覽器中輕敲和打開。

這是我應得的

<p>This is a simple text with some embedded <a href="http://example.com/link/to/some/page?param1=77&param2=22">links</a>. 
This is a <a href="https://exmp.le/sample-page/?uu=1">different link</a>. 

如何處理這個文本和所有錨標籤鏈接到各自的href？什麼我想要實現

僞代碼：

let finalContentLabel = TTTAttributedLabel(frame: CGRect.zero) 
for (linkText, linkHref) in paragraph.anchorTags() { 
    let range:NSRange = (finalContentLabel.text as! NSString).range(of: linkText) 
    finalContentLabel.addLink(to: URL(string: linkHref), with: range) 
} 

我想通了一切，但paragraph.anchorTags()位。

Answer 1

您可以使用標準的標籤和HTML創建屬性串，那麼你必須在你的標籤鏈接

let label = UILabel() 
let attributedText = try? NSAttributedString(data: <your string>.data(using: .utf8)!, options: 
      [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, 
      NSCharacterEncodingDocumentAttribute: String.Encoding.utf8 ], 
      documentAttributes: nil) 

//接下來會OBJC

NSMutableAttributedString *mutableText = [[NSMutableAttributedString alloc] initWithAttributedString:attributedText]; 

self.textContainer = [[NSTextContainer alloc] initWithSize:self.label.bounds.size]; 
self.textContainer.lineFragmentPadding = 0; 
self.textContainer.maximumNumberOfLines = self.label.numberOfLines; 
self.textContainer.lineBreakMode = self.label.lineBreakMode; 
self.layoutManager = [NSLayoutManager new]; 
[self.layoutManager addTextContainer:self.textContainer]; 
self.textStorage = [[NSTextStorage alloc] initWithAttributedString:self.label.attributedText]; 
[self.textStorage addLayoutManager:self.layoutManager]; 

在一個屬性串，帶鏈接的文本範圍將具有屬性NSLinkAttributeName。您可以在該屬性上覆蓋enumerateAttribute，併爲該屬性的每個範圍添加您自己的字體和顏色，從該範圍中刪除該NSLinkAttributeName，然後添加MYLinkAttributeName屬性。

[attributedText enumerateAttribute:NSLinkAttributeName inRange:NSMakeRange(0, attributedText.length) options:kNilOptions usingBlock:^(id _Nullable value, NSRange range, BOOL * _Nonnull stop) { 
      if (nil != value) 
      { 
       [mutableText addAttribute:NSStrokeColorAttributeName value:greenColor range:range]; 
       [mutableText addAttribute:NSForegroundColorAttributeName value:greenColor range:range]; 
       [mutableText addAttribute:MYLinkAttributeName value:value range:range]; 
       [mutableText removeAttribute:NSLinkAttributeName range:range]; 
      } 
     }]; 

此後，在標籤上添加UITapGestureRecognizer並執行其delegate回調

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch 
{ 
    self.textContainer.size = self.label.bounds.size; 
    NSUInteger index = [self.layoutManager characterIndexForPoint:[touch locationInView:self.label] 
              inTextContainer:self.textContainer 
        fractionOfDistanceBetweenInsertionPoints:NULL]; 
    self.lastTouchedLinkAttributeValue = [self.label.attributedText attribute:MYLinkAttributeName atIndex:index effectiveRange:NULL]; 

    return nil != self.lastTouchedLinkAttributeValue; 
} 

最後，識別動作：

- (IBAction)tapRegognized:(id)sender 
{ 
    // Here value of 'href' is stored in self.lastTouchedLinkAttributeValue as NSURL instance. 
}