Question

当文本'@'符号出现在twitter中时，我需要使用TTTAttributeLabel点击该部分。例如：“hi @test hello text”。只有@test部分可点击。我正在uitableview单元格中使用TTTAttributeLabel类，以便当用户按下标签的其他部分时表格didSelectedRowAtIndexPath方法调用意味着不要点击'@test'。

提前致谢。

Answer 1

您可以使用以后会拦截的伪网址，为支持链接的任何可用UILabel替换添加自定义操作：

TTTAttributedLabel *tttLabel = <# create the label here #>;
NSString *labelText = @"Lost? Learn more.";
tttLabel.text = labelText;
NSRange r = [labelText rangeOfString:@"Learn more"]; 
[tttLabel addLinkToURL:[NSURL URLWithString:@"action://show-help"] withRange:r];

然后，在TTTAttributedLabelDelegate：

中

- (void)attributedLabel:(TTTAttributedLabel *)label didSelectLinkWithURL:(NSURL *)url {
    if ([[url scheme] hasPrefix:@"action"]) {
        if ([[url host] hasPrefix:@"show-help"]) {
            /* load help screen */
        } else if ([[url host] hasPrefix:@"show-settings"]) {
            /* load settings screen */
        }
    } else {
        /* deal with http links here */
    }
}

TTTAttributedLabel是OHAttributedLabel的分支。

如果您想要更复杂的方法，请查看Nimbus Attributed Label。它支持开箱即用的自定义链接。

或

查看RTLabel

Answer 2

您可以使用this question中的代码示例（请参阅highlightMentionsInString:函数）

然后将此代码添加到tableView:cellForRowAtIndexPath:：

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
      MyCell *cell;
      // configure your cell
      // ...
      cell.attributedLabel.delegate = self;
      cell.attributedLabel.userInteractionEnabled = YES;
      cell.attributedLabel.text = someText;
      [self highlightMentionsInLabel:cell.attributedLabel]
      return cell;
 }

 - (void)highlightMentionsInLabel:(TTTAttributedLabel *)attributedLabel {
      NSString *text = attributedLabel.text;
      NSRegularExpression *mentionExpression = [NSRegularExpression regularExpressionWithPattern:@"(?:^|\\s)(@\\w+)" options:NO error:nil];
      // and so on, use code from question I linked above
      // ...
 }
 ...

 # pragma mark - TTTAttributedLabelDelegate

 - (void)attributedLabel:(TTTAttributedLabel *)label didSelectLinkWithURL:(NSURL *)url {
     // your code here to handle `user:username` links
 }

如果你想在用户/＃标签录制时有不同的行为，你需要为#hashtags实现单独的highlightTagsInLabel:方法，使用不同的正则表达式和不同的网址（例如tag:tag_string）并在之后调用它highlightMentionsInLabel:

Answer 3

您可以为支持链接的UILabel替换添加假网址方案链接，并使用委托点击链接点击链接。

例如：

TTTAttributedLabel *label = <# create the label here #>;
NSString *labelText = @"My name is @test.";
label.text = labelText;
NSRange r = [labelText rangeOfString:@"Learn more"]; 
// here you can add some params to your url
[label addLinkToURL:[NSURL URLWithString:@"your-fake-scheeme://say-hello"] withRange:r];

然后为您的标签添加委托并实现attributionLabel：didSelectLinkWithURL：method：

- (void)attributedLabel:(TTTAttributedLabel *)label didSelectLinkWithURL:(NSURL *)url {
    if ([[url scheme] hasPrefix:@"your-fake-scheeme"]) {
        if ([[url host] hasPrefix:@"say-hello"]) {
            //parse your url and extract params to do something
        } 
    } else {
        // if it is a regular link open it in browser
        [[UIApplication sharedApplication] openURL:url];
    }
}

我认为标签中的链接不会与您的表格视图冲突

Answer 4

这对我在Swift中有用（需要定义两个扩展名），你可以在这里找到它们

NSRange <-> Range extensions

func highlightMentionsInLabel(attributedLabel:TTTAttributedLabel){

    let textObject = attributedLabel.text

    var mentionExpression:NSRegularExpression?

    do {
        mentionExpression = try NSRegularExpression(pattern: "(?:^|\\s)(@\\w+)", options: NSRegularExpressionOptions.CaseInsensitive)

    }catch{
        print("error:\(error)")
        return
    }

    if let text = textObject, let expression = mentionExpression{

        let matches: [NSTextCheckingResult] = expression.matchesInString(text, options: NSMatchingOptions.init(rawValue: 0), range: NSMakeRange(0, text.characters.count))
        for match: NSTextCheckingResult in matches {
            let matchRange: NSRange = match.rangeAtIndex(1)

            let swiftRange = text.rangeFromNSRange(matchRange)!

            let mentionString: String = text.substringWithRange(swiftRange)

            let linkRange = text.rangeOfString(mentionString)

            let index:String.Index = mentionString.startIndex.advancedBy(1)
            let user = mentionString.substringFromIndex(index)
            let linkURLString: String = "user:\(user)"
            attributedLabel.addLinkToURL(NSURL(string: linkURLString)!, withRange: linkURLString.NSRangeFromRange(linkRange!))
        }
    }
}

如何使用TTTAttributedLabel与＆＃39; @＆＃39;和＆＃39;＃＆＃39 ;?

4 个答案: