ios swift：是否可以更改字符串中某个单词的字体样式？

问题描述

我从DB内容中提取为字符串。使用方法，我从该字符串中提取最长的单词。

I am extracting from a DB contents as strings. With a method I extract the longest word out of this string.

现在我想将整个字符串打印成文本标签，但想在字符串中突出显示不同颜色和文本样式的最长字。

Now I would like to print out the entire string to a text label but would like to highlight the longest word in a different color and text style within the string.

我该怎么做？
我是否需要将字符串剪成碎片 - 设置格式 - 并在将它们放到标签之前将它们全部放在一起？

How can I do that?Do I need to cut the string into pieces - set the formatting - and put them all together again before giving it to the label?

或者还有其他（更好）方式吗？

Or is there any other (better) way?

推荐答案

如果你已经知道最长的单词，你必须得到字符串中该单词的范围。我更喜欢NSString方法 rangeOfString：。

If you already know the longest word you have to get the range of that word in the string. I prefer the NSString method rangeOfString: for this.

然后使用默认属性从字符串创建 NSMutableAttributedString 。最后，将突出显示属性应用于您之前想出的范围。

You then create a NSMutableAttributedString from the string, with your default attributes. Finally you apply highlighting attributes to the range you figured out earlier.

let longString = "Lorem ipsum dolor. VeryLongWord ipsum foobar"
let longestWord = "VeryLongWord"

let longestWordRange = (longString as NSString).rangeOfString(longestWord)

let attributedString = NSMutableAttributedString(string: longString, attributes: [NSFontAttributeName : UIFont.systemFontOfSize(20)])

attributedString.setAttributes([NSFontAttributeName : UIFont.boldSystemFontOfSize(20), NSForegroundColorAttributeName : UIColor.redColor()], range: longestWordRange)


label.attributedText = attributedString

在我的操场上看起来像这样：

Which looks like this in my playground:

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