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我正在开发聊天应用程序，如果输入的文本是 URL，则必须在其中检测到输入的文本。如果是这样，请更改其颜色并在其下划线。请看下面的截图：

颜色

要更改网址的颜色，我使用了以下代码：

NSString *urlString = [[detetctedURL absoluteString] stringByRemovingPercentEncoding];

            /* *detetctedURL is detected url from entered text using NSDataDetector
            /* *for messageText http://stackoverflow.com/somefolder/any-[thing]-etc, the detectedURL is http://stackoverflow.com/somefolder/any-%5Bthing%5B-etc */

            NSRange r = [messageText rangeOfString:urlString];
            if (r.location != NSNotFound)
            {
                 //colorFromHex 4285f4
                 [atext addAttribute:NSForegroundColorAttributeName value:[UIColor colorWithRed:66.0/255.0 green:133.0/255.0 blue:244.0/255.0 alpha:1.0] range:r];
                 [atext addAttribute:NSUnderlineStyleAttributeName value:@(NSUnderlineStyleSingle) range:r];
                 //set attributed text (atext) to UILabel               
            }

如果 messageText 包含带有特殊字符和百分比编码的 URL，或者只有百分比编码，我如何正确格式化检测到的 URL？

谢谢！

更新 ：

在以下代码的帮助下，我能够获得所需的范围。但是，对于大多数链接来说，它几乎可以正常工作，但并非所有链接都像存在']-('等字符的情况。

NSString *urlString = [url absoluteString];
        NSRange r = [messageText rangeOfString:urlString];
        BOOL foundRange = YES;
        if (r.location == NSNotFound)
        {
            foundRange = NO;
            //for umlauts or special characters
            urlString = [[url absoluteString] stringByRemovingPercentEncoding];
            r = [messageText rangeOfString:urlString];
            if (r.location == NSNotFound)
            {
                //for white space in url
                urlString = [urlString stringByReplacingOccurrencesOfString:@" " withString:@"%20"];
                r = [messageText rangeOfString:urlString];

                if (r.location == NSNotFound)
                {
                    urlString = [url absoluteString];
                    NSString *prefix = url.scheme;
                    if(prefix)
                    {
                        prefix = [prefix stringByAppendingString:@"://"];
                        urlString = [urlString stringByReplacingOccurrencesOfString:prefix withString:@""];
                        r = [messageText rangeOfString:urlString];
                        if (r.location == NSNotFound)
                        {
                            urlString = [urlString stringByRemovingPercentEncoding];
                            r = [messageText rangeOfString:urlString];
                            if (r.location == NSNotFound)
                            {
                                urlString = [urlString stringByReplacingOccurrencesOfString:@" " withString:@"%20"];
                                r = [messageText rangeOfString:urlString];
                                if (r.location != NSNotFound){ foundRange = YES; }
                            }else{ foundRange = YES; }
                        }else{ foundRange = YES; }
                    }
                }else{ foundRange = YES; }
            }else{ foundRange = YES; }
        }

        if (foundRange)
        {
            //colorFromHex 4285f4
            [atext addAttribute:NSForegroundColorAttributeName value:[UIColor colorWithRed:66.0/255.0 green:133.0/255.0 blue:244.0/255.0 alpha:1.0] range:r];

            [atext addAttribute:NSUnderlineStyleAttributeName value:@(NSUnderlineStyleSingle) range:r];

            myLabel.attributedText = atext; 
        }
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2 回答 2

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用于NSDataDetector查找和突出显示 url。

NSDataDetector* detector = [NSDataDetector dataDetectorWithTypes: NSTextCheckingTypeLink 
                                                           error: nil];

NSArray* matches = [detector matchesInString: source 
                                     options: 0 
                                       range: NSMakeRange(0, [source length])];

您可以使用它来查找电话号码、地址等。

于 2018-03-24T14:59:49.110 回答
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在您的文本视图上设置 .dataDetectorTypes 而不是尝试自己更改颜色。UITextView 将负责突出显示自身。

于 2018-03-26T11:54:56.177 回答