UITextView属性文本和语法高亮显示 [英] UITextView attributedText and syntax highlighting

问题描述

因此，对于iOS 6，UITextView可以使用一个referencedString，这对于语法高亮显示非常有用。

So, with iOS 6 an UITextView can take an attributedString, which could be useful for Syntax highlighting.

我在 -textView：shouldChangeTextInRange：replacementText：中做了一些正则表达式模式，而且我经常需要更改已经输入的单词的颜色。我没有看到除了重置attributesText之外的其他选项，这需要时间。

I'm doing some regex patterns in -textView:shouldChangeTextInRange:replacementText: and oftentimes I need to change the color of a word already typed. I see no other options than resetting the attributedText, which takes time.

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    //A context will allow us to not call -attributedText on the textView, which is slow.
    //Keep context up to date
    [self.context replaceCharactersInRange:range withAttributedString:[[NSAttributedString alloc] initWithString:text attributes:self.textView.typingAttributes]];

    // […]

    self.textView.scrollEnabled = FALSE;

    [self.context setAttributes:self.defaultStyle range:NSMakeRange(0, self.context.length)];
    [self refresh]; //Runs regex-patterns in the context
    textView.attributedText = self.context;

    self.textView.selectedRange = NSMakeRange(range.location + text.length, 0);
    self.textView.scrollEnabled = TRUE;

    return FALSE;
}

这在模拟器上运行得很好，但在iPad 3上每个 -setAttributedText 需要几百毫秒。

This runs okayish on the simulator, but on an iPad 3 each -setAttributedText takes a few hundreds of milliseconds.

我向Apple提交了一个错误，要求能够改变它attributedText。它被标记为重复，所以我看不出他们对此有何看法。

I filed a bug to Apple, with the request of being able to mutate the attributedText. It got marked as a duplicate, so I cannot see what they're saying about this.

更具体的问题：
如何在UITextView中更改某些范围的颜色，其中包含大量多色文本，并且在每个 shouldReplaceText ... ？

更广泛的问题：
如何进行语法突出显示在iOS 6中使用UITextView？

The more broad question: How do you do syntax highlighting with a UITextView in iOS 6?

推荐答案

attributionText访问器必须往返于HTML的往返，所以它实际上是非最适合语法突出显示的文本视图实现。在iOS 6上，您可能希望直接使用CoreText。

The attributedText accessors have to round-trip to/from HTML, so it's really non-optimal for a syntax-highlighted text view implementation. On iOS 6, you'll probably want to use CoreText directly.

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