Hyperlinks in a UITextView

Use NSAttributedString

NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:@"Google" 
                                                                       attributes:@{ NSLinkAttributeName: [NSURL URLWithString:@"http://www.google.com"] }];
self.textView.attributedText = attributedString;

Sure, you can set just a portion of the text to be the link. Please read more about the NSAttributedString here.

If you want to have more control and do something before opening the link. You can set the delegate to the UITextView.

- (void)viewDidLoad {
    ...
    self.textView.delegate = self; // self must conform to UITextViewDelegate protocol
}

...

- (BOOL)textView:(UITextView *)textView shouldInteractWithURL:(NSURL *)URL inRange:(NSRange)characterRange {
    // Do whatever you want here
    NSLog(@"%@", URL); // URL is an instance of NSURL of the tapped link
    return YES; // Return NO if you don't want iOS to open the link
}

Swift 3, iOS10 , Xcode 9

@sikhapol's answer is really nice if you knew exactly the words you want to parse like "word dictionary" somehow

it's all about the string itself that displayed in UITextView

My solution is based on the text rendering if you make the UITextView render HTML tags you may use href tag

Here is some Code references you may use

first, you need to configure UITextView from interface builder or form code to

1. Selectable
2. Data detectores

Note: do not make the textview editable

Interface builder

programmatically

         let htmlData = NSString(string: "go to <a href=\"http://www.google.com\">google</a> and search for it").data(using: String.Encoding.unicode.rawValue)


        let attributedString = try! NSAttributedString(data: htmlData!, options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType], documentAttributes: nil)
        yourUIViewView.isSelectable = true
        yourUIViewView.dataDetectorTypes = .link
        yourUIViewView.attributedText = attributedString
        yourUIViewView.delegate = self

for the UITextViewDelegate

    func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange, interaction: UITextItemInteraction) -> Bool {
    
       // check for the url string for performing your own custom actions here
      let urlString = URL.absoluteString
    
       // Return NO if you don't want iOS to open the link
        return true
     }