How to make particular location is clickable in UiLabel in UITableView?

Question

I'm having a UITabelView in that I'm having a UILabel . UILabel will be populated with different text contents with one Email id (all mail id's are same). I want to make this Email id clickable. So far I have done is I highlight this email id with blue colour and underlined it. I add a tap gesture to the UILabel ,but it makes whole UILabel to be clickable . I want to make this email id is only clickable. Is there is any way to make this possible. I'm having custom table cell class,in that only I added tap gesture .

Answer 1

Use UITextView instead of UILabel , And make sure add following, In your CellForRowAtIndexPath method:

<YourTableViewcell>.textView.editable = NO;
<YourTableViewcell>.textView.dataDetectorTypes = UIDataDetectorTypeAll;

The good thing is you need not handle the Email Click Actions, the UITextView will take care and open an email for you (with clicked an email, prepopulated in TO section).

Answer 2

Use TTAttributeLabel and which will be helpful detecting attributes and much more

Example for link detection :

TTTAttributedLabel *label = [[TTTAttributedLabel alloc] initWithFrame:CGRectZero];
label.enabledTextCheckingTypes = NSTextCheckingTypeLink; // Automatically detect links when the label text is subsequently changed
label.delegate = self; // Delegate methods are called when the user taps on a link (see `TTTAttributedLabelDelegate` protocol)

label.text = @"Fork me on GitHub! (https://github.com/mattt/TTTAttributedLabel/)"; // Repository URL will be automatically detected and linked

NSRange range = [label.text rangeOfString:@"me"];
[label addLinkToURL:[NSURL URLWithString:@"http://github.com/mattt/"] withRange:range]; // Embedding a custom link in a substring

Following Delegate method is called when a link is detected.

// Delegate methods
- (void)attributedLabel:(TTTAttributedLabel *)label
   didSelectLinkWithURL:(NSURL *)url {
// Implement the code
}

Answer 3

in cellForRowAtIndexPath:

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:@"String with a link" attributes:nil];
NSRange linkRange = NSMakeRange(14, 4); // for the word "link" in the string above
NSDictionary *linkAttributes = @{ NSForegroundColorAttributeName : [UIColor colorWithRed:0.05 green:0.4 blue:0.65 alpha:1.0],  NSUnderlineStyleAttributeName : @(NSUnderlineStyleSingle) };

[attributedString setAttributes:linkAttributes range:linkRange];

// Assign attributedText to UILabel
customCell.bodyLabel.attributedText = attributedString;
customCell.bodyLabel.userInteractionEnabled = YES;

[customCell.bodyLabel addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapOnLabel:)]];


- (void)handleTapOnLabel:(UITapGestureRecognizer *)tapGesture {
    UILabel *label = (UILabel *)tapGesture.view;
    NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];
    NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:CGSizeZero];
    NSString *string = [label text];
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:string attributes:nil];
    NSTextStorage *textStorage = [[NSTextStorage alloc] initWithAttributedString:attributedString];

// Configure layoutManager and textStorage

   [layoutManager addTextContainer:textContainer];
   [textStorage addLayoutManager:layoutManager];

// Configure textContainer

   textContainer.lineFragmentPadding = 0.0;
   textContainer.lineBreakMode = label.lineBreakMode;
   textContainer.maximumNumberOfLines = label.numberOfLines;

   CGPoint locationOfTouchInLabel = [tapGesture locationInView:tapGesture.view];
   CGSize labelSize = tapGesture.view.bounds.size;
   CGRect textBoundingBox = [layoutManager usedRectForTextContainer:textContainer];
   CGPoint textContainerOffset = CGPointMake((labelSize.width - textBoundingBox.size.width) * 0.5 - textBoundingBox.origin.x, (labelSize.height - textBoundingBox.size.height) * 0.5 - textBoundingBox.origin.y);

   CGPoint locationOfTouchInTextContainer = CGPointMake(locationOfTouchInLabel.x - textContainerOffset.x, locationOfTouchInLabel.y - textContainerOffset.y);
   NSInteger indexOfCharacter = [layoutManager characterIndexForPoint:locationOfTouchInTextContainer inTextContainer:textContainer fractionOfDistanceBetweenInsertionPoints:nil];

   NSRange linkRange = NSMakeRange(14, 4); // it's better to save the range somewhere when it was originally used for marking link in attributed string

   if (NSLocationInRange(indexOfCharacter, linkRange)) {

    // Open an URL, or handle the tap on the link in any other way

      [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"your url"]];
   }
}