迅捷:转换为NSAttributed字符串的HTML数据无法使链接在标签中可点击 [英] swift: The HTML data converted to NSAttributed string doesn't make the links clickable in label

问题描述

我有一个HTML格式的文本.我正在使用NSAttributed字符串的属性来解析它.它可以很好地解析文本并显示在标签上.但是，锚标记的解析不会使链接可单击.这是我用于解析的以下代码.

 扩展字符串{var htmlToAttributedString:NSAttributedString吗?{警卫让数据=数据(使用:.utf8)，否则{返回NSAttributedString()}做 {返回尝试NSAttributedString(数据:数据，选项:[.documentType:NSAttributedString.DocumentType.html，.characterEncoding:String.Encoding.utf8.rawValue]，documentAttributes:无)} 抓住 {返回NSAttributedString()}}var htmlToString:字符串{返回htmlToAttributedString?.string?"} 

当我运行应用程序并将其值赋予标签时:

  text =< p>这是< a href = \" http://www.google.com \> Google主页</a></p>"simpleTextLabel.attributedText = text.htmlToAttributedString 

iOS App上的输出如下所示，但单击时无反应:

这是 Google主页.

如何在野生动物园中将其打开?

解决方案

从您所在的行开始:

  simpleTextLabel.attributedText = text.htmlToAttributedString 

我们可以假设 simpleTextLabel 是 UILabel .

这是 UILabel 的基本行为，它是不可交互的".您可以在其上添加轻击手势，但会将其转换为 UIButton .

有一些技巧可以使 UILabel 成为可能，找到确切被点击的位置，检查是否存在链接等.寻找"UILabel可点击":创建可点击的"; links在UILabel的NSAttributedString中?等.甚至还有一些第三方库.

我(以我的拙见)将其视为黑客".

WWDC 2018会议:TextKit最佳实践.在2:34，它说明了如果您需要与显示的文本进行交互，则首选 UITextView 而不是 UILabel .

有一个专门用于此目的的 UITextViewDelegate 方法: textView(_:shouldInteractWith:in:interaction:)

请注意， UITextView 和 UILabel 的呈现方式略有不同.如果叠加它们，它们将不会具有相同的起点"，布局会有所不同.但是，只需稍作更改，它就可以相同(例如:

When I run the app and give the value to the label as:

text = "<p>This is <a href=\"http://www.google.com\">Google Home</a></p>"
simpleTextLabel.attributedText = text.htmlToAttributedString

The output on the iOS App looks like following but nothing happens on clicking :

This is Google Home.

How can I make it open in safari?

解决方案

From your line:

simpleTextLabel.attributedText = text.htmlToAttributedString

We can assume that simpleTextLabel is a UILabel.

It's basic behavior from a UILabel to not be "interactable". You can add a tap gesture on it, but it transform it as a UIButton.

There are some tricks to make it possible with a UILabel, find where exactly it has been tapped, check if there is a link, etc. Looking for "UILabel Clickable": Create tap-able "links" in the NSAttributedString of a UILabel? etc. There are even a few third party libs.

I (in my humble opinion) consider it as a "hack".

There is a good WWDC 2018 Session: TextKit Best Practices. At 2:34, it explains that if you need to interact with a shown text, prefers UITextView over UILabel.

There is a UITextViewDelegate method just for that: textView(_:shouldInteractWith:in:interaction:)

Note that there a small differences in the rendering of a UITextView and a UILabel. If you superpose them, they won't have the same "start point", the layout is a little different. However, with small changes, it can be the same (for instance: How can I make a UITextView layout text the same as a UILabel?).

Note also that according to the small modifications of a UITextView into a UILabel visual rendering, the user won't notice the difference (and that's in fact what matters, beside that using native methods of the UITextView/UITextViewDelegate make it easily understandable afterwards by another developer, or in a few months if you need to do a small modification).

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