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I am making a highlighter app. It stores everything you've highlighted, and what file you've highlighted it from.

I have a problem, however. I know that all my syntax is correct and that the program should be working. I've tested everything I can think of to try and isolate the problem, and the best conclusion I could come to was that whenever I do setAttributes_range_(styleshere,NSRange(?,?)) it crashes because I am using the currently selected text for the start and ending index ranges in the NSRange object. I don't know why this affects it, but when I use predefined indexes and run the program, it does everything just fine.

How exactly are you getting the selected range?

Through ui.TextView().selected_range the attribute for my TextView.

TextView.selected_range
A 2-tuple (start, end) that represents the current user selection. When setting this, a ValueError is thrown for ranges that are out of bounds.

Whereas NSrange takes a start, length.

TextView.attr_text.addAttributes_range_(d,NSRange(TextView.selected_range[0],len(TextView.text)-(len(TextView.text)-TextView.selected_range[1])))

Where attr_text is an attribute I set myself that stores the atrributed text of the TextView. Just a simpler way to find it when I need it.

And also where d is a dictionary of attributes I have.

This doesn't work either. I tried to use the little bit of math in the second paramter of NSRange to grab the length of which I need.

the second param should just be selected_range[2]-selected_range[1].

try creating the NSRange, and check the length is valid before you call the set attribute method. Perhaps you have an invalid selected range? (-1 for example)

Perhaps you could post a minimal example of something which works for hard coded values, but not for programattically generated values?

Also... you have a mutable attributed string, not a concrete one, right? and you have enabled editing?

Yes to the last couple questions. Let me look through it real quick. Thanks so much!

By the way, here is a simple example showing a similar problem, though using a regexp range instead of selected_text, but same basic idea.