UILabel圆角、边框、宽度自适应

//设置圆角_userCompanyLabel.layer.masksToBounds = YES;//必须设置_userCompanyLabel.layer.cornerRadius = labelHight/2;//设置圆角的弧度，等于label的高的一半的时候，是个圆

//设置边框_userCompanyLabel.layer.borderColor = [SNColorFromRGB(backgroundColor1) CGColor];//边框颜色_userCompanyLabel.layer.borderWidth = 4;//边框的宽度

_userCompanyLabel.text = text;CGFloat width = 78;

//根据text来找到宽度，size为最大宽度和最大高度，当为单行时options为<span style="font-family: Arial, Helvetica, sans-serif;">NSStringDrawingUsesLineFragmentOrigin即可，为多行时</span><span style="font-family: Arial, Helvetica, sans-serif;">NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading,attributes中设置front，</span><span style="font-family: Arial, Helvetica, sans-serif;"></span>    CGRect rect = [text boundingRectWithSize:CGSizeMake(320, 40) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:28]} context:nil];if (rect.size.width > 78) {width = rect.size.width;}[_userCompanyLabel mas_makeConstraints:^(MASConstraintMaker *make) {make.top.equalTo(_userNameLabel.mas_bottom).offset(6*bili);make.centerX.equalTo(_userNameLabel.mas_centerX);make.size.mas_equalTo(CGSizeMake(width, 28));}];