iOS_计算文本高度

<span style="font-family: Menlo; background-color: rgb(255, 255, 255);">这段代码应该是大多数人工具类中都有的, 但是真要用的时候一时又想不起来, 需要去找, 在这儿写出来方便以后用</span>

</pre><pre name="code" class="objc">//计算字符串长度
+ (CGSize)sizeWithText:(NSString *)text font:(CGFloat)font
{
    CGSize size = [text sizeWithAttributes:@{NSFontAttributeName:
                                                 [UIFont systemFontOfSize:ResultSize(font)],
                                             NSStrokeColorAttributeName:
                                                 [UIColor blackColor],
                                             NSForegroundColorAttributeName:
                                                 [UIColor blackColor]}];
    return size;
}

今天又遇到个计算高度问题, 是NSAttributedString 之后在动态计算高度, 但是会发现用上边的方法因为文字间距变大, 所以算出来的距离不准,便把间距也加进去

+ (CGSize)sizeOfTextFontSize:(CGFloat)fontSize maxSize:(CGSize)maxSize spacing:(CGFloat)spacing
{
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    [paragraphStyle setLineSpacing:spacing];
    NSDictionary *attrs = @{NSFontAttributeName:[UIFont systemFontOfSize:fontSize],NSParagraphStyleAttributeName: paragraphStyle};
    return [self boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:attrs context:nil].size;
}