iOS - UITextView计算行数的和字符串行高

- (CGFloat )returnTextHeightWithStr:(NSString *)str withFont:(UIFont *)font WithWidth:(CGFloat)width WithLineSpacing:(CGFloat)lineSpacing  {
    UITextView* _textView = [[UITextView alloc]init];
    _textView.font = font;
    //设置行间距
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];
    paragraphStyle.lineSpacing = lineSpacing;
    NSMutableAttributedString *titleAttr = [[NSMutableAttributedString alloc] initWithString:str];
    [titleAttr addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, titleAttr.length)];
    [titleAttr addAttribute:NSFontAttributeName value:font range:NSMakeRange(0, titleAttr.length)];
    _textView.attributedText = titleAttr;
    CGSize maxSize = CGSizeMake(width,CGFLOAT_MAX);
    CGSize newSize = [_textView sizeThatFits:maxSize];
    CGFloat height = ceilf(newSize.height);
    return height;
}

extension String {
    
    //获取内容size
    func getContentSize(font: UIFont, size: CGSize) -> CGSize {
        if self.count == 0 {
            return CGSize.zero
        }
        return (self as NSString).boundingRect(with: size, options: NSStringDrawingOptions(rawValue: NSStringDrawingOptions.usesLineFragmentOrigin.rawValue | NSStringDrawingOptions.usesFontLeading.rawValue), attributes: [.font: font], context: nil).size
    }
    func getContentHeight(font: UIFont, width: CGFloat) -> CGFloat {
        return self.getContentSize(font: font, size: CGSize(width: width, height: CGFloat.greatestFiniteMagnitude)).height
    }
    func getContentWidth(font: UIFont, height: CGFloat) -> CGFloat {
        return self.getContentSize(font: font, size: CGSize(width: CGFloat.greatestFiniteMagnitude, height: height)).width
    }
}