iOS微信朋友圈的点赞、评论功能，即点击昵称跳转到个人主页

   <pre>  <code class="language-objectivec">很多社交软件，都会有这么一个功能，就是点击部分文字，触发一个事件，像微信朋友圈、QQ空间那样点击评论者的昵称跳转到个人主页，或者点击点赞人的昵称跳转到个人主页。       本菜鸟在做社交项目的时候也遇到这个问题，一开始不知道怎么处理好。找了网上的方法，都是说：1：昵称上面覆盖一个UIButton 。 2：设置文字部分区域，触发事件。       本菜鸟觉得第二种方法可靠，于是找了第三方，比如：TTTAttributedLabel、YYText 、RTLabel都是很不错的第三方富文本。但是本菜鸟又突发奇想，我只是要实现这个简单的功能，强大的苹果应该不至于这么傻吧，于是就想着这么折腾一个不用第三方的办法出来，然后就....     你懂的 ...     下面直接贴效果图 ...  不喜勿喷,大神多多指教。</code></pre>    <p>评论的效果图：</p>    <p style="text-align: center;"><img src="https://simg.open-open.com/show/f3618372f4f5346eca6792a4b2ea4821.png"></p>    <p>点赞的效果图:</p>    <p style="text-align: center;"><img src="https://simg.open-open.com/show/994eb74cb80c2eb3485708b20f9d9477.png"></p>    <p>直接贴代码：（调用UILable的扩展类）</p>    <p>在使用的地方调用方法：</p>    <pre>  <code class="language-objectivec">-(void)richTextLable  {      //评论      NSString *nameOne = @"张三";      NSString *nameTwo = @"我是李四";      NSString *replyString = @"您好，您现在在干什么，么么哒。这个功能应该满足需求了。";        NSString *totalString = [NSString stringWithFormat:@"%@回复%@：%@",nameOne,nameTwo,replyString];      NSMutableAttributedString *newString = [[NSMutableAttributedString alloc] initWithString:totalString];      [newString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:16] range:NSMakeRange(0, totalString.length)];      [newString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0, nameOne.length)];      [newString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(nameOne.length+2, nameTwo.length)];      //设置行距 实际开发中间距为0太丑了，根据项目需求自己把握      NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];      style.lineSpacing = 3;      [newString addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(0, totalString.length)];        UILabel *richTextLbl = [[UILabel alloc] initWithFrame:CGRectMake(20, 100, self.view.bounds.size.width - 40, 20)];      //richTextLbl.backgroundColor = [UIColor greenColor];      richTextLbl.numberOfLines = 0;//设置UILable自适应      richTextLbl.attributedText = newString;      [self.view addSubview:richTextLbl];      [richTextLbl sizeToFit];        [richTextLbl onTapRangeActionWithString:@[nameOne,nameTwo] tapClicked:^(NSString *string, NSRange range, NSInteger index) {          NSLog(@"点击了-->--%@ ---下标：%ld",string,index);      }];          //点赞      UILabel *goodLbl = [[UILabel alloc] init];      goodLbl.frame = CGRectMake(20, 170, 100, 20);      goodLbl.text = @"点赞的:";      [self.view addSubview:goodLbl];        NSArray *goodArray = @[@"张三",@"李四",@"王五",@"李兆",@"粟子",@"小李",@"李四",@"王五",@"李兆",@"粟子",@"小李"];      NSString *goodTotalString = [goodArray componentsJoinedByString:@", "];        NSMutableAttributedString *newGoodString = [[NSMutableAttributedString alloc] initWithString:goodTotalString];      [newGoodString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:16] range:NSMakeRange(0, goodTotalString.length)];        //设置行距 实际开发中间距为0太丑了，根据项目需求自己把握      NSMutableParagraphStyle *paragraphstyle = [[NSMutableParagraphStyle alloc] init];      paragraphstyle.lineSpacing = 3;      [newGoodString addAttribute:NSParagraphStyleAttributeName value:paragraphstyle range:NSMakeRange(0, goodTotalString.length)];        UILabel *goodTextLbl = [[UILabel alloc] initWithFrame:CGRectMake(20, 200, self.view.bounds.size.width - 40, 20)];      goodTextLbl.backgroundColor = [UIColor orangeColor];      goodTextLbl.numberOfLines = 0;//设置UILable自适应      goodTextLbl.attributedText = newGoodString;      [self.view addSubview:goodTextLbl];      [goodTextLbl sizeToFit];        [goodTextLbl onTapRangeActionWithString:goodArray tapClicked:^(NSString *string, NSRange range, NSInteger index) {          NSLog(@"这是第--%ld--个点赞的,他是--%@",index,string);      }];  }</code></pre>    <p>下面是UILable扩展类</p>    <pre>  <code class="language-objectivec">#import <UIKit/UIKit.h>    @interface XLRichTextModel : NSObject    @property (nonatomic, copy) NSString *string;  @property (nonatomic, assign) NSRange range;    @end    @interface UILabel (Category)    ///是否显示点击效果，默认是打开  @property (nonatomic, assign) BOOL isShowTagEffect;    ///TagArray  点击的字符串数组  - (void)onTapRangeActionWithString:(NSArray <NSString *> *)TagArray tapClicked:(void (^) (NSString *string , NSRange range , NSInteger index))tapClick;    @end</code></pre>    <pre>  <code class="language-objectivec">#import "UILabel+Category.h"  #import <objc/runtime.h>  #import <CoreText/CoreText.h>  #import <Foundation/Foundation.h>    @implementation XLRichTextModel    @end    @implementation UILabel (Category)    #pragma mark - AssociatedObjects    - (NSMutableArray *)attributeStrings  {      return objc_getAssociatedObject(self, _cmd);  }    - (void)setAttributeStrings:(NSMutableArray *)attributeStrings  {      objc_setAssociatedObject(self, @selector(attributeStrings), attributeStrings, OBJC_ASSOCIATION_RETAIN_NONATOMIC);  }    - (NSMutableDictionary *)effectDic  {      return objc_getAssociatedObject(self, _cmd);  }    - (void)setEffectDic:(NSMutableDictionary *)effectDic  {      objc_setAssociatedObject(self, @selector(effectDic), effectDic, OBJC_ASSOCIATION_RETAIN_NONATOMIC);  }    - (BOOL)isTapAction  {      return [objc_getAssociatedObject(self, _cmd) boolValue];  }    - (void)setIsTapAction:(BOOL)isTapAction  {      objc_setAssociatedObject(self, @selector(isTapAction), @(isTapAction), OBJC_ASSOCIATION_ASSIGN);  }    - (void (^)(NSString *, NSRange, NSInteger))tapBlock  {      return objc_getAssociatedObject(self, _cmd);  }    - (void)setTapBlock:(void (^)(NSString *, NSRange, NSInteger))tapBlock  {      objc_setAssociatedObject(self, @selector(tapBlock), tapBlock, OBJC_ASSOCIATION_COPY_NONATOMIC);  }    - (BOOL)isShowTagEffect  {      return [objc_getAssociatedObject(self, _cmd) boolValue];  }    -(void)setIsShowTagEffect:(BOOL)isShowTagEffect  {      objc_setAssociatedObject(self, @selector(isShowTagEffect), @(isShowTagEffect), OBJC_ASSOCIATION_ASSIGN);      self.isTapEffect = isShowTagEffect;  }    - (BOOL)isTapEffect  {      return [objc_getAssociatedObject(self, _cmd) boolValue];  }    - (void)setIsTapEffect:(BOOL)isTapEffect  {      objc_setAssociatedObject(self, @selector(isTapEffect), @(isTapEffect), OBJC_ASSOCIATION_ASSIGN);  }    #pragma mark - 事件方法  - (void)onTapRangeActionWithString:(NSArray <NSString *> *)TagArray tapClicked:(void (^) (NSString *string , NSRange range , NSInteger index))tapClick  {      //获取部分点击的区域      [self tagRangeActionWithString:TagArray];        if (self.tapBlock != tapClick) {          self.tapBlock = tapClick;      }  }    #pragma mark - touchAction  - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event  {      if (!self.isTapAction) {          return;      }        if (objc_getAssociatedObject(self, @selector(isShowTagEffect))) {          self.isTapEffect = self.isShowTagEffect;      }        UITouch *touch = [touches anyObject];        CGPoint point = [touch locationInView:self];        __weak typeof(self) weakSelf = self;        [self tapFrameWithTouchPoint:point result:^(NSString *string, NSRange range, NSInteger index) {            if (weakSelf.tapBlock) {              weakSelf.tapBlock (string , range , index);          }            if (self.isTapEffect) {                [self saveEffectDicWithRange:range];                [self tapEffectWithStatus:YES];          }        }];  }    - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {        if (self.isTapAction) {          if ([self tapFrameWithTouchPoint:point result:nil]) {              return self;          }      }      return [super hitTest:point withEvent:event];  }    #pragma mark - 获取点击的范围  - (BOOL)tapFrameWithTouchPoint:(CGPoint)point result:(void (^) (NSString *string , NSRange range , NSInteger index))resultBlock  {      CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)self.attributedText);        CGMutablePathRef Path = CGPathCreateMutable();        CGPathAddRect(Path, NULL, CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height));        CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), Path, NULL);        CFRange range = CTFrameGetVisibleStringRange(frame);        if (self.attributedText.length > range.length) {            UIFont *font ;            if ([self.attributedText attribute:NSFontAttributeName atIndex:0 effectiveRange:nil]) {                font = [self.attributedText attribute:NSFontAttributeName atIndex:0 effectiveRange:nil];            }else if (self.font){              font = self.font;            }else {              font = [UIFont systemFontOfSize:17];          }            Path = CGPathCreateMutable();            CGPathAddRect(Path, NULL, CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height + font.lineHeight));            frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), Path, NULL);      }        CFArrayRef lines = CTFrameGetLines(frame);        if (!lines) {          return NO;      }        CFIndex count = CFArrayGetCount(lines);        CGPoint origins[count];        CTFrameGetLineOrigins(frame, CFRangeMake(0, 0), origins);        CGAffineTransform transform = [self transformForCoreText];        CGFloat verticalOffset = 0;        for (CFIndex i = 0; i < count; i++) {          CGPoint linePoint = origins[i];            CTLineRef line = CFArrayGetValueAtIndex(lines, i);            CGRect flippedRect = [self lineBounds:line point:linePoint];            CGRect rect = CGRectApplyAffineTransform(flippedRect, transform);            rect = CGRectInset(rect, 0, 0);            rect = CGRectOffset(rect, 0, verticalOffset);            NSParagraphStyle *style = [self.attributedText attribute:NSParagraphStyleAttributeName atIndex:0 effectiveRange:nil];            CGFloat lineSpace;            if (style) {              lineSpace = style.lineSpacing;          }else {              lineSpace = 0;          }            CGFloat lineOutSpace = (self.bounds.size.height - lineSpace * (count - 1) -rect.size.height * count) / 2;            rect.origin.y = lineOutSpace + rect.size.height * i + lineSpace * i;            if (CGRectContainsPoint(rect, point)) {                CGPoint relativePoint = CGPointMake(point.x - CGRectGetMinX(rect), point.y - CGRectGetMinY(rect));                CFIndex index = CTLineGetStringIndexForPosition(line, relativePoint);                CGFloat offset;                CTLineGetOffsetForStringIndex(line, index, &offset);                if (offset > relativePoint.x) {                  index = index - 1;              }                NSInteger link_count = self.attributeStrings.count;                for (int j = 0; j < link_count; j++) {                    XLRichTextModel *model = self.attributeStrings[j];                    NSRange link_range = model.range;                  if (NSLocationInRange(index, link_range)) {                      if (resultBlock) {                          resultBlock (model.string , model.range , (NSInteger)j);                      }                      return YES;                  }              }          }      }      return NO;  }    - (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event  {      if (self.isTapEffect) {            [self performSelectorOnMainThread:@selector(tapEffectWithStatus:) withObject:nil waitUntilDone:NO];        }  }    - (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event  {      if (self.isTapEffect) {            [self performSelectorOnMainThread:@selector(tapEffectWithStatus:) withObject:nil waitUntilDone:NO];        }  }    - (CGAffineTransform)transformForCoreText  {      return CGAffineTransformScale(CGAffineTransformMakeTranslation(0, self.bounds.size.height), 1.f, -1.f);  }    - (CGRect)lineBounds:(CTLineRef)line point:(CGPoint)point  {      CGFloat ascent = 0.0f;      CGFloat descent = 0.0f;      CGFloat leading = 0.0f;      CGFloat width = (CGFloat)CTLineGetTypographicBounds(line, &ascent, &descent, &leading);      CGFloat height = ascent + fabs(descent) + leading;        return CGRectMake(point.x, point.y , width, height);  }    #pragma mark - 是否显示点击效果  默认是   项目中一般是现实点击效果  - (void)tapEffectWithStatus:(BOOL)status  {      if (self.isTapEffect) {          NSMutableAttributedString *attStr = [[NSMutableAttributedString alloc] initWithAttributedString:self.attributedText];            NSMutableAttributedString *subAtt = [[NSMutableAttributedString alloc] initWithAttributedString:[[self.effectDic allValues] firstObject]];            NSRange range = NSRangeFromString([[self.effectDic allKeys] firstObject]);            if (status) {              [subAtt addAttribute:NSBackgroundColorAttributeName value:[UIColor lightGrayColor] range:NSMakeRange(0, subAtt.string.length)];                [attStr replaceCharactersInRange:range withAttributedString:subAtt];          }else {                [attStr replaceCharactersInRange:range withAttributedString:subAtt];          }          self.attributedText = attStr;      }  }    - (void)saveEffectDicWithRange:(NSRange)range  {      self.effectDic = [NSMutableDictionary dictionary];        NSAttributedString *subAttribute = [self.attributedText attributedSubstringFromRange:range];        [self.effectDic setObject:subAttribute forKey:NSStringFromRange(range)];  }    #pragma mark - 获取部分点击的区域  - (void)tagRangeActionWithString:(NSArray <NSString *>  *)strings  {      if (self.attributedText == nil) {          self.isTapAction = NO;          return;      }        self.isTapAction = YES;        self.isTapEffect = YES;        __block  NSString *totalStr = self.attributedText.string;        self.attributeStrings = [NSMutableArray array];        __weak typeof(self) weakSelf = self;        [strings enumerateObjectsUsingBlock:^(NSString * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {            NSRange range = [totalStr rangeOfString:obj];            if (range.length != 0) {                totalStr = [totalStr stringByReplacingCharactersInRange:range withString:[weakSelf stringWithRange:range]];                XLRichTextModel *model = [XLRichTextModel new];                model.range = range;                model.string = obj;                [weakSelf.attributeStrings addObject:model];            }        }];  }    - (NSString *)stringWithRange:(NSRange)range  {      NSMutableString *string = [NSMutableString string];        for (int i = 0; i < range.length ; i++) {            [string appendString:@" "];      }      return string;  }    @end</code></pre>    <p> </p>    <p>来自：http://www.jianshu.com/p/34369aed6789</p>    <p> </p>