Join the social network of Tech Nerds, increase skill rank, get work, manage projects...
 
  • How to detect tapped word in UItextview

    • 0
    • 0
    • 0
    • 0
    • 0
    • 0
    • 0
    • 0
    • 5.03k
    Comment on it

    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

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

       ii) Handle gesture recognizer

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

    iii) Get tapped word

    - (NSString *)wordAtPosition:(CGPoint)position
    {
        //eliminate scroll offset
        position.y += textViewDescription.contentOffset.y;
        //get location in text from textposition at point
        UITextPosition *tapPosition = [textViewDescription closestPositionToPoint:position];
        //fetch the word at this position (or nil, if not available)
        UITextRange *textRange = [textViewDescription.tokenizer rangeEnclosingPosition:tapPosition withGranularity:UITextGranularityWord inDirection:UITextLayoutDirectionRight];
        
        NSString *tappedWord = [[NSString alloc]initWithString:[textViewDescription textInRange:textRange]];
        
        int start = [textViewDescription offsetFromPosition:textViewDescription.beginningOfDocument toPosition:textRange.start];
        if (start>0) {
            char lastChar = [textViewDescription.text characterAtIndex:start-1];
            if (lastChar == '#') {
                tappedWord = [NSString stringWithFormat:@"#%@",tappedWord];
            }
        }
        return tappedWord;
    }
    

 0 Comment(s)

Sign In
                           OR                           
                           OR                           
Register

Sign up using

                           OR                           
Forgot Password
Fill out the form below and instructions to reset your password will be emailed to you:
Reset Password
Fill out the form below and reset your password: