NSAttributedString是Objective-C中的屬性字串類，GitHub上也有很多第三方，用得較多的是TTTAttributedLabel，這裡給大家介紹一下系統NSAttributedString類來實現富文字，並可實現點選事件，同時點選事件可攜帶引數。
因為要做點選事件，所以我們用UITextView，首先宣告一個UITextView屬性：

@property (nonatomic, strong) UITextView *textView;

NSAttributedString中NSFontAttributeName是用來設定文字字型的，有很多可以設定的屬性，這裡介紹一些常用的，其他的用到的話修改一下key-value就可以了：

//NSFontAttributeName:文字字型
- (void)setAttributeCorlorAndSize{
    _textView = [[UITextView alloc]initWithFrame:CGRectMake(0, 30, SCREEN_WIDTH, 100)];
    _textView.editable = NO;
    _textView.selectable = NO;
    _textView.scrollEnabled = NO;
    _textView.autoresizingMask = UIViewAutoresizingFlexibleHeight;
    [self
 
.view addSubview:_textView];

    //初始化屬性字串
    NSMutableAttributedString * aAttributedString = [[NSMutableAttributedString alloc] initWithString:@"富文字：文字顏色 字型大小 背景色 下劃線 空心 點選事件"];
    //文字顏色
    [aAttributedString addAttribute:NSForegroundColorAttributeName
                              value:[UIColor redColor]
                              range:NSMakeRange(4
 
, 4)];

    //文字大小
    [aAttributedString addAttribute:NSFontAttributeName
                              value:[UIFont systemFontOfSize:18]
                              range:NSMakeRange(9, 4)];


    //文字背景色
    [aAttributedString addAttribute:NSBackgroundColorAttributeName
                              value:[UIColor blueColor]
                              range:NSMakeRange(14, 3)];

    //下劃線  NSUnderlineColorAttributeName設定下劃線顏色
    [aAttributedString addAttribute:NSUnderlineStyleAttributeName
                        value:[NSNumber numberWithInt:1]
                        range:NSMakeRange(18, 3)];

    //空心
    [aAttributedString addAttribute:NSStrokeWidthAttributeName
                              value:[NSNumber numberWithInt:3]
                              range:NSMakeRange(22, 2)];
    //點選事件攜帶一個NSInteger型別，值為110的引數
    [aAttributedString addAttribute:@"tapID" value:[NSNumber numberWithInteger:110] range:NSMakeRange(25, 4)];

    [_textView addGestureRecognizer:[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(textTapped:)]];


    NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    //行間距
    paragraphStyle.lineSpacing = 15.0;

    [aAttributedString addAttribute:NSParagraphStyleAttributeName
                             value:paragraphStyle
                             range:NSMakeRange(0, aAttributedString.length)];



    _textView.attributedText = aAttributedString;
}

點選事件實現：

-(void)textTapped:(UITapGestureRecognizer*)recognizer{

    NSLayoutManager *layoutManager = _textView.layoutManager;
    CGPoint location = [recognizer locationInView:_textView];
    location.x -= _textView.textContainerInset.left;
    location.y -= _textView.textContainerInset.top;

    NSUInteger characterIndex = [layoutManager characterIndexForPoint:location
                                                      inTextContainer:_textView.textContainer
                             fractionOfDistanceBetweenInsertionPoints:NULL];

    if(characterIndex < _textView.textStorage.length){
        NSRange range;
        id number = [_textView.attributedText attribute:@"tapID" atIndex:characterIndex effectiveRange:&range];
        NSNumber *value_id = number;

        NSLog(@"%@", value_id);
    }
}

NSParagraphStyleAttributeName用來設定段落樣式（字串通過“\n”進行分段，此設定必須在lable.numberOfLines = 0時有效，value通過NSMutableParagraphStyle設定，它有以下屬性）

- (void)setAttributeParagraph{

    UILabel *label2 = [[UILabel alloc]initWithFrame:CGRectMake(0, 130, SCREEN_WIDTH, 200)];
    label2.numberOfLines = 0;
    [self.view addSubview:label2];

    NSMutableAttributedString * attributedString = [[NSMutableAttributedString alloc] initWithString:@"NSParagraphStyleAttributeName　段落樣式（字串通過“\n”進行分段，此設定必須在lable.numberOfLines = 0時有效，value通過NSMutableParagraphStyle設定，它有以下屬性）"];
    //段落樣式
    NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    //段落間距
    paragraphStyle.paragraphSpacing = 20.0;

    [attributedString addAttribute:NSParagraphStyleAttributeName
                                          value:paragraphStyle
                                          range:NSMakeRange(0, attributedString.length)];

         label2.attributedText = attributedString;
}

效果圖，點選事件就不演示了，但點選“點選事件”四個字的時候，控制檯列印所攜帶的引數110。