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如何在CoreText中设置行距？

发布于 2024-09-19 19:11:52 字数 108 浏览 4 评论 0原文

您可以使用 CTFontGetLeading(aCTFont) 获取它，但是如何设置它呢？

谁能解释一下吗？

还有其他办法解决这个问题吗？也许您必须手动设置行之间的间距？

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做个ˇ局外人 2024-09-26 19:11:53

我发现当我在一个段落中使用多种字体时，设置最小和最大行高是不够的。我还必须将行间距设置为 0，否则行的行距会不一致。这是我的完整解决方案：

CGFloat lineHeight = 68.0f;
CGFloat lineSpacing = 0.0f;

CTParagraphStyleSetting setting[4] = {
    {kCTParagraphStyleSpecifierMaximumLineHeight, sizeof(CGFloat), &lineHeight},
    {kCTParagraphStyleSpecifierMinimumLineHeight, sizeof(CGFloat), &lineHeight},
    {kCTParagraphStyleSpecifierMaximumLineSpacing, sizeof(CGFloat), &lineSpacing},
    {kCTParagraphStyleSpecifierMinimumLineSpacing, sizeof(CGFloat), &lineSpacing}
};

CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(setting, 4);

NSRange fullRange = NSMakeRange(0, [mutString length]);

[mutString addAttributes:[NSDictionary dictionaryWithObjectsAndKeys:(__bridge id)paragraphStyle, 
                          (NSString*)kCTParagraphStyleAttributeName, nil]
                   range:fullRange];

CFRelease(paragraphStyle);

I found that when I was using multiple typefaces in a single paragraph, setting the min and max line height was not enough. I also had to set the line spacing to 0, otherwise the lines would have inconsistant leading. Here's my complete solution:

CGFloat lineHeight = 68.0f;
CGFloat lineSpacing = 0.0f;

CTParagraphStyleSetting setting[4] = {
    {kCTParagraphStyleSpecifierMaximumLineHeight, sizeof(CGFloat), &lineHeight},
    {kCTParagraphStyleSpecifierMinimumLineHeight, sizeof(CGFloat), &lineHeight},
    {kCTParagraphStyleSpecifierMaximumLineSpacing, sizeof(CGFloat), &lineSpacing},
    {kCTParagraphStyleSpecifierMinimumLineSpacing, sizeof(CGFloat), &lineSpacing}
};

CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(setting, 4);

NSRange fullRange = NSMakeRange(0, [mutString length]);

[mutString addAttributes:[NSDictionary dictionaryWithObjectsAndKeys:(__bridge id)paragraphStyle, 
                          (NSString*)kCTParagraphStyleAttributeName, nil]
                   range:fullRange];

CFRelease(paragraphStyle);

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