在不使用换行符的情况下定义核心文本段落? [英] Define Core Text paragraphs without using newline character?

问题描述

在为NSAttributedString中的段落应用适当的顶部和底部间距时，我遇到了一个小问题.我正在使用此代码来设置段落属性:

I am having a trivial problem with applying proper top and bottom spacing for the paragraphs in NSAttributedString. I am usng this code to set paragraph attributes:

int sf = sizeof(CGFloat);
        CTParagraphStyleSetting settings[ParagraphStylesSupported] = 
            {
                { kCTParagraphStyleSpecifierAlignment, sizeof(QuartzTextAlignment), &style.textAlignment },
                { kCTParagraphStyleSpecifierParagraphSpacingBefore, sf, &marginTop},
                { kCTParagraphStyleSpecifierParagraphSpacing, sf, &marginBot},
                { kCTParagraphStyleSpecifierMinimumLineHeight, sf, &lineHeight},

                { kCTParagraphStyleSpecifierLineSpacing, sf, &lineSpacing},
                { kCTParagraphStyleSpecifierFirstLineHeadIndent, sf, &style.firstLineIndent},

            };

            CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(settings, ParagraphStylesSupported);


            [string addAttribute:(NSString*)kCTParagraphStyleAttributeName value:(id)paragraphStyle range:item.range];
            CFRelease(paragraphStyle);

文本属性正在按预期方式应用.但是段落对齐几乎没有问题:

Text properties are being applied as expected. But there are few problems with paragraph alignment:

1. 除非属性范围的开头有换行符\ n，否则各段之间不能相互放置，而是以内联"形式流动.
2. 当我添加换行符时，段落将正确地放置在另一个段落的下面，但是换行符的行高将被添加到间距"ParagraphSpacing"的间隙中.
3. kCTParagraphStyleSpecifierParagraphSpacingBefore也影响段落范围内的换行符.

什么Core Text布局引擎将其解释为段落指示符?是属性字符串中的每个换行符吗?

What Core Text layout engine interprets as a paragraph indicator? Is it every newline character in the attributed string?

推荐答案

在Core Text中，换行符( \ n )结束了一个段落.我认为没有办法告诉它使用其他字符.

In Core Text, the newline character (\n) ends a paragraph. I don't think there is a way to tell it to use a different character.

如果您连续放置两个换行符，则Core Text的作用就好像您有一个空的段落一样，因此它将以多余的间距放置.

If you put two newlines in a row, then Core Text will act as if you have an empty paragraph, so it will put in extra spacing.

确保每个段落后只有一个换行符.如果您的段落之间仍然留有太多空间，则需要为 kCTParagraphStyleSpecifierParagraphSpacingBefore 或 kCTParagraphStyleSpecifierParagraphSpacing (或两者)使用较小的值.

Make sure you only have one newline after each paragraph. If your paragraphs still have too much space between them, you need to use a smaller value for kCTParagraphStyleSpecifierParagraphSpacingBefore or kCTParagraphStyleSpecifierParagraphSpacing (or both).

这篇关于在不使用换行符的情况下定义核心文本段落?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！