In a UITextView, I am using attributes to highlight certain parts of the text,
based on a user action.
Since the attributedText property is not mutable, for now I am creating a new
string, add the attribute, and then set that for the attributed string.
It works, but I wonder if this is the correct way to do it, since I am creating
a new string for every user action:
// calculate the range to be highlighted
NSRange aRange = [self calculateNewRangeToHighlight];
// create a new NSMutableAttributedString by getting a mutable copy of the
current attributed string
NSMutableAttributedString *attributedString = [self.attributedText
mutableCopy];
// remove all old highlights if present
[attributedString removeAttribute: NSBackgroundColorAttributeName range:
NSMakeRange(0, self.text.length)];
// add the new highlight range
[attributedString addAttribute: NSBackgroundColorAttributeName value:
[UIColor yellowColor] range: aRange];
// now set the new attributed string to the textview
self.attributedText = attributedString;
- Koen.
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