using UITextPosition, get previous character from textInRange

Question

I've been searching high and low and can't figure out how to do this. Lets say I have a string like this:

NSString *string = @"&foo !foo";

What I'm trying to do is differentiate between the two foos (sounds funny haha) inside a text view. When I click on one, I want to know which (& or !) comes before it. Here's how I'm getting the word:

UITapGestureRecognizer *recognizer = (UITapGestureRecognizer *)sender; UITextView *TV = (UITextView*)recognizer.view; CGPoint location = [recognizer locationInView:TV]; location.y += TV.contentOffset.y; UITextPosition *tapPosition = [TV closestPositionToPoint:CGPointMake(location.x, location.y)]; UITextRange *textRange = [TV.tokenizer rangeEnclosingPosition:tapPosition withGranularity:UITextGranularityWord inDirection:UITextLayoutDirectionRight]; NSString *tappedWord = [TV textInRange:textRange];

I can't figure out how to get the previous character. TV.tokenizer UITextGranularityCharacter only gets the closest letter, not the symbol. Any solutions for this?

Community · Accepted Answer · 2017-05-23 12:19:20Z

Check: Convert selectedTextRange UITextRange to NSRange to convert your UITextRange to a NSRange (that I'll call selectedRange).

Inspiring me with the previous answer to the linked question, you'd need to add this at the end of your code:

UITextPosition *beginning = TV.beginningOfDocument; UITextPosition *selectionStart = textRange.start; UITextPosition *selectionEnd = textRange.end; NSInteger location = [TV offsetFromPosition:beginning toPosition:selectionStart]; NSInteger length = [TV offsetFromPosition:selectionStart toPosition:selectionEnd]; NSRange selectedRange = NSMakeRange(location,lenght); NSRange range = NSMakeRange(selectedRange.location-1,1) //Maybe need to check if selectedRange.location>0 NSString *yourCharString = [[TV text] substringWithRange:range];

Thanks for the reply. I saw that post before. Before I make the new NSRange, I have to convert my UITextRange into a NSRange?
Yes, you have to transform the UITextRange (I corrected the "NSTextRange") into a NSRange.
Ok thanks. Even though I'm still confused about how to do it. I have the position of the tap, do I still need to break it down to UITextPosition selectionStart and selectionEnd?
I edited my answer. You should just have to add my code at the end of yours.
It's ok. I just had to paste the previous answer code a rename a few var. But as long as you understand and it works.

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