Given a NSRange and a NSAttributedString, what's the best way to verify that the range is valid, and won't exceed the bounds of the attributed string?
I am trying to do this:
[mutableAttributedString enumerateAttribute:NSFontAttributeName inRange:underlineRange options:NSAttributedStringEnumerationLongestEffectiveRangeNotRequired usingBlock:^(id value, NSRange range, BOOL * _Nonnull stop) {
....
However the underlineRange could be manipulated in a way that it falls outside the mutableAttributedString ranges. In that case, it ends up causing an exception.
What's the best way to handle this case? I can't find any NSAttributedString method that lets you verify that a range is valid for a given attributed string.
NSRange underlineRange = ...;
NSRange fullRange = NSMakeRange(0, mutableAttributedString.length);
underlineRange = NSIntersectionRange(underlineRange, fullRange);
if (underlineRange.length == 0) {
// intersection is empty - underlineRange was entirely outside the string
} else {
// underlineRange is now a valid range in mutableAttributedString
}