-[NSAttributedString boundingRectWithSize] rect是html的错误

Question

如果html元素是<p>或<div>，则rect将是错误的。

如果html元素为<span>，则rect将是正确的。

例如

http://test-1252137158.file.myqcloud.com/myFloder/WX20180717-112628%402x.png

http://test-1252137158.file.myqcloud.com/myFloder/WX20180717-112649%402x.png

http://test-1252137158.file.myqcloud.com/myFloder/WX20180717-112706%402x.png

代码：

https://github.com/HJaycee/questions/blob/master/iOS_attributedString/rich_html/rich_html/ViewController.m

Answer 1

您还需要传递标记NSStringDrawingUsesFontLeading来考虑所使用的字体。

类似的东西（第41行）：

CGRect rect = [str boundingRectWithSize:CGSizeMake(200, CGFLOAT_MAX)
options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading
context:NULL];

Answer 2

NSRange tailRange = NSMakeRange(attributedString.length - 1, 1);
if (attributedString.length > 1 &&
    [[[attributedString attributedSubstringFromRange:tailRange] string] isEqualToString:@"\n"]) {
    [attributedString replaceCharactersInRange:tailRange withString:@""];
}

CGRect rect = [self.attributeString boundingRectWithSize:CGSizeMake(width,     CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading context:NULL];

ceilf(rect.size.height);