计算文本的宽高

1.没行间距的可以调用

- (CGRect)boundingRectWithSize:(CGSize)size options:(NSStringDrawingOptions)options attributes:(nullable NSDictionary<NSAttributedStringKey, id> *)attributes context:(nullable NSStringDrawingContext *)context NS_AVAILABLE(10_11, 7_0);

2.有行间距的可以这样：

- (CGRect)boundsWithFontSize:(CGFloat)fontSize text:(NSString *)text needWidth:(CGFloat)needWidth lineSpacing:(CGFloat )lineSpacing
{
    
    NSMutableAttributedString *attributeString = [[NSMutableAttributedString alloc] initWithString:text];
    
    NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
    
    style.lineSpacing = lineSpacing;
    
    UIFont *font = Font_Light(fontSize);
    
    [attributeString addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(0, text.length)];
    
    [attributeString addAttribute:NSFontAttributeName value:font range:NSMakeRange(0, text.length)];
    
    NSStringDrawingOptions options = NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading;
    
    CGRect rect = [attributeString boundingRectWithSize:CGSizeMake(needWidth, CGFLOAT_MAX) options:options context:nil];
    
    
    
    return rect;
    
}