Tappable Attributed UITextView

TapableTextView.m

// in a tap gesture recognizer handler in view controller
// assuming you have a text view in controller called "myTextView"

- (void)myTextViewTapped:(UITapGestureRecognizer *)recognizer {
    // get tap location in view in question
    CGPoint location = [recognizer locationInView:self.myTextView];
    
    // adjust location for text view's offsets
    location.x -= self.myTextView.textContainerInset.left;
    location.y -= self.myTextView.textContainerInset.top;
    
    // get the specific letter that was tapped
    NSInteger characterIndex = [self.myTextView.layoutManager characterIndexForPoint:location 
                                                                     inTextContainer:self.positionStanceTextView.textContainer 
                                            fractionOfDistanceBetweenInsertionPoints:0];
    
    int minimum = 0;
    int maximum = 10;
    
    // if tapped charater is within arbitrary range, do whatever you want
    if (characterIndex >= minimum - && characterIndex <= maximum) {
        // do something here (i.e. delegate callback)
    }
}