How to detect tapped word in UItextview

Posted by Sachin Joshi
3
Computers
Dec 15, 2015
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We might face a situation when we need to add action on tapping a particular word from a string on the iPhone screen like a link or a hashtag etc. Now though we can easily add a UITapGestureRecognizer on a UITextView or UILabel, finding the exact tapped word is tricky. Here is how to do this (using UITextView and UILongPressGestureRecognizer) : i) Add gesture recognizer to text view

i) Add gesture recognizer to text view

  1. UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressResponse:)];
  2.     [textViewDescription addGestureRecognizer:longPress];

   ii) Handle gesture recognizer

  1. - (void)longPressResponse:(UILongPressGestureRecognizer *)recognizer {
  2.     if (recognizer.state == UIGestureRecognizerStateBegan) {
  3.         CGPoint location = [recognizer locationInView:textViewDescription];
  4.         NSString *tappedWord = [self wordAtPosition:CGPointMake(location.x, location.y)];
  5.         NSLog(@"tappedWord %@",tappedWord);
  6.     }
  7. }

iii) Get tapped word

  1. - (NSString *)wordAtPosition:(CGPoint)position
  2. {
  3.     //eliminate scroll offset
  4.     position.y += textViewDescription.contentOffset.y;
  5.     //get location in text from textposition at point
  6.     UITextPosition *tapPosition = [textViewDescription closestPositionToPoint:position];
  7.     //fetch the word at this position (or nil, if not available)
  8.     UITextRange *textRange = [textViewDescription.tokenizer rangeEnclosingPosition:tapPosition withGranularity:UITextGranularityWord inDirection:UITextLayoutDirectionRight];
  9.     
  10.     NSString *tappedWord = [[NSString alloc]initWithString:[textViewDescription textInRange:textRange]];
  11.     
  12.     int start = [textViewDescription offsetFromPosition:textViewDescription.beginningOfDocument toPosition:textRange.start];
  13. ..............
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