IOS 9 UITextView 链接点击延迟

系统原因
可以不用textView delegate 里面的实现，而是给UITextView加上tap gesture：

- (void)handleLinkTap:(UITapGestureRecognizer *)sender {
    UITextPosition *position = [contentView closestPositionToPoint:[sender locationInView:contentView]];
    NSDictionary<NSAttributedStringKey, id> *testStylings = [contentView textStylingAtPosition:position inDirection:UITextStorageDirectionForward];
    NSString *url = testStylings[NSLinkAttributeName];
    // Handle the url
}