yycking/UILabel+Link.m

## test.m
self.policyLabel.html = @"Please <a href='https://gist.github.com/yycking/aef2cb0afafbaf3a04a4e40123704437'>clcik me</a>. ";

## UILabel+Link.m
@implementation UILabel (PLUS)

- (void)setHtml:(NSString*)text {
    NSString *color = [self hexFromUIColor:self.textColor];

    NSString *html = [NSString stringWithFormat:@"<html><head><style type=\"text/css\">\
                      body {font-family: '%@'; font-size:%@px;color: %@;}\
                      a {color: %@;}\
                      </style></head><body>%@</body></html>",
                      self.font.fontName, @(self.font.pointSize), color,
                      color,
                      text];
    self.attributedText = [[NSAttributedString alloc] initWithData:[html dataUsingEncoding:NSUTF8StringEncoding]
                                                           options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
                                                                     NSCharacterEncodingDocumentAttribute: @(NSUTF8StringEncoding)}
                                                documentAttributes:nil error:nil];
    self.userInteractionEnabled = YES;
    [self addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapOnLabel:)]];
}

- (void)handleTapOnLabel:(UITapGestureRecognizer *)tapGesture
{
    NSAttributedString *text = self.attributedText;
    NSRange range = NSMakeRange(0, text.length);
    CGPoint touch = [tapGesture locationInView:self];

    NSLayoutManager *layoutManager = NSLayoutManager.new;

    NSTextStorage *textStorage = [NSTextStorage.alloc initWithAttributedString:text];
    [textStorage addLayoutManager:layoutManager];

    NSTextContainer *textContainer = [NSTextContainer.alloc initWithSize:self.bounds.size];
    textContainer.lineFragmentPadding  = 0;
    textContainer.maximumNumberOfLines = self.numberOfLines;
    textContainer.lineBreakMode        = self.lineBreakMode;

    [layoutManager addTextContainer:textContainer];

    [layoutManager ensureLayoutForGlyphRange:range];
    CGRect textBoundingBox = [layoutManager usedRectForTextContainer:textContainer];
    CGPoint textContainerOffset = CGPointMake(
                                              (self.bounds.size.width - textBoundingBox.size.width) * 0.5 - textBoundingBox.origin.x,
                                              (self.bounds.size.height - textBoundingBox.size.height) * 0.5 - textBoundingBox.origin.y);
    CGPoint locationOfTouchInTextContainer = CGPointMake(touch.x - textContainerOffset.x,
                                                         touch.y - textContainerOffset.y);


    NSInteger characterIndex = [layoutManager characterIndexForPoint:locationOfTouchInTextContainer inTextContainer:textContainer fractionOfDistanceBetweenInsertionPoints:nil];

    NSDictionary *attrs = [text attributesAtIndex:characterIndex effectiveRange:&range];
    NSString *url = attrs[NSLinkAttributeName];
    if (url) {

    }
}

@end
	@implementation UILabel (PLUS)

	- (void)setHtml:(NSString*)text {
	NSString *color = [self hexFromUIColor:self.textColor];

	NSString *html = [NSString stringWithFormat:@"<html><head><style type=\"text/css\">\
	body {font-family: '%@'; font-size:%@px;color: %@;}\
	a {color: %@;}\
	</style></head><body>%@</body></html>",
	self.font.fontName, @(self.font.pointSize), color,
	color,
	text];
	self.attributedText = [[NSAttributedString alloc] initWithData:[html dataUsingEncoding:NSUTF8StringEncoding]
	options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
	NSCharacterEncodingDocumentAttribute: @(NSUTF8StringEncoding)}
	documentAttributes:nil error:nil];
	self.userInteractionEnabled = YES;
	[self addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapOnLabel:)]];
	}

	- (void)handleTapOnLabel:(UITapGestureRecognizer *)tapGesture
	{
	NSAttributedString *text = self.attributedText;
	NSRange range = NSMakeRange(0, text.length);
	CGPoint touch = [tapGesture locationInView:self];

	NSLayoutManager *layoutManager = NSLayoutManager.new;

	NSTextStorage *textStorage = [NSTextStorage.alloc initWithAttributedString:text];
	[textStorage addLayoutManager:layoutManager];

	NSTextContainer *textContainer = [NSTextContainer.alloc initWithSize:self.bounds.size];
	textContainer.lineFragmentPadding = 0;
	textContainer.maximumNumberOfLines = self.numberOfLines;
	textContainer.lineBreakMode = self.lineBreakMode;

	[layoutManager addTextContainer:textContainer];

	[layoutManager ensureLayoutForGlyphRange:range];
	CGRect textBoundingBox = [layoutManager usedRectForTextContainer:textContainer];
	CGPoint textContainerOffset = CGPointMake(
	(self.bounds.size.width - textBoundingBox.size.width) * 0.5 - textBoundingBox.origin.x,
	(self.bounds.size.height - textBoundingBox.size.height) * 0.5 - textBoundingBox.origin.y);
	CGPoint locationOfTouchInTextContainer = CGPointMake(touch.x - textContainerOffset.x,
	touch.y - textContainerOffset.y);


	NSInteger characterIndex = [layoutManager characterIndexForPoint:locationOfTouchInTextContainer inTextContainer:textContainer fractionOfDistanceBetweenInsertionPoints:nil];

	NSDictionary *attrs = [text attributesAtIndex:characterIndex effectiveRange:&range];
	NSString *url = attrs[NSLinkAttributeName];
	if (url) {

	}
	}

	@end