iOS 动态计算文字的高度

//动态计算文字的高度

- (CGSize)CalculationSizeWithStr:(NSString *)str FontSize:(UIFont*)font value:(NSValue *)value LineSpace:(CGFloat)space{

        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];

        paragraphStyle.lineSpacing = space;  // 行间隔

        NSMutableAttributedString *attributes = [[NSMutableAttributedString alloc] initWithString:str];

        [attributes addAttribute:NSFontAttributeName value:font range:NSMakeRange(0, str.length)];

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

        CGSize size = [attributes boundingRectWithSize:[value CGSizeValue] options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading context:nil].size;

//    }

    return size;

}