UITextView富文本

    _textView = [[UITextView alloc]initWithFrame:CGRectMake(20, 50, 200, 200)];
    UILabel * myLabel = [[UILabel alloc]initWithFrame:CGRectMake(20, 300, 200, 200)];
    myLabel.backgroundColor = [UIColor yellowColor];
    _textView.backgroundColor = [UIColor yellowColor];
    [self.view addSubview:myLabel];
    [self.view addSubview:_textView];
    // 定义一个可变属性字符串对象
    NSMutableAttributedString * str = [[NSMutableAttributedString alloc]initWithString:@"缓缓飘落的枫叶像思念我点燃烛火温暖岁末的秋天激光掠过天边被风掠过想你的思念"];
    // 设置字体大小 range是设置范围，下同
    [str addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:15] range:NSMakeRange(0, 5)];
    // 设置字体颜色
    [str addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(2, 5)];
    // 设置下划线
    [str addAttribute:NSUnderlineStyleAttributeName value:@(NSUnderlineStyleSingle) range:NSMakeRange(3, 7)];
    // 设置字体样式
    [str addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Geeza Pro" size:25] range:NSMakeRange(5, 5)];
    //NSLog(@"字体集合%@",[UIFont familyNames]);
    // 删除线 常用于划掉原价
    [str addAttribute:NSStrikethroughStyleAttributeName value:@(NSUnderlinePatternSolid | NSUnderlineStyleSingle) range:NSMakeRange(8, 5)];
    // 删除线的颜色(先设置删除线再设置颜色)
    [str addAttribute:NSStrikethroughColorAttributeName value:[UIColor redColor] range:NSMakeRange(8, 5)];
    // 设置空心字
    [str addAttribute:NSStrokeWidthAttributeName value:@1 range:NSMakeRange(18, 5)];
    // 插入图片
    NSTextAttachment * att = [[NSTextAttachment alloc]init];
    att.image = [UIImage imageNamed:@"2"];
    NSAttributedString * attStr = [NSAttributedString attributedStringWithAttachment:att];
    [str insertAttributedString:attStr atIndex:25];
    // 添加链接
    [str addAttribute:NSLinkAttributeName value:[NSURL URLWithString:@"http://www.baidu.com"] range:NSMakeRange(30, 6)];

    // 创建字体段落 行间距 格式
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    paragraphStyle.lineSpacing = 50;
    paragraphStyle.firstLineHeadIndent = 30;// 设置为字体大小大两倍

    [str addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, str.string.length)];
    // 这句不能写前面，不然没效果
    _textView.attributedText = [str copy];
    _textView.editable = NO;
    _textView.delegate = self;
    myLabel.attributedText = str;
    myLabel.numberOfLines = 0;