在CTFrame中设置行距 [英] Setting line spacing in a CTFrame
问题描述
我正在使用一种QR Code生成器,它是Mac应用程序. 我知道如何绘制文本,但是我不知道如何设置行距.
I'm working in a kind of QR Code generator, it's a Mac app. I know how draw the text, but I don't know how I can set line spacing.
我的代码:
// Prepare font
CTFontRef font = CTFontCreateWithName(CFSTR("LucidaSansUnicode"), 16, NULL);
// Create Path
CGMutablePathRef gpath = CGPathCreateMutable();
CGPathAddRect(gpath, NULL, CGRectMake(10, 0, pixelsWidth, pixelsHigh));
CGContextSetTextDrawingMode (newcontext, kCGTextFill);
CGContextSetGrayFillColor(newcontext, 0.0, 1.0);
// Create an attributed string
CFStringRef keys[] = { kCTFontAttributeName };
CFTypeRef values[] = { font };
CFDictionaryRef attr = CFDictionaryCreate(NULL, (const void **)&keys, (const void **)&values,
sizeof(keys) / sizeof(keys[0]), &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
CFAttributedStringRef attrString = CFAttributedStringCreate(NULL, stringCode, attr);
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)attrString);
CTFrameRef theFrame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, CFAttributedStringGetLength(attrString)), gpath, NULL);
// Draw the string
CTFrameDraw(theFrame, newcontext);
我一直在搜索,但没有找到任何东西.也许我必须使用CTLine吗?
I have been searching but I don't find anything. Maybe must I use CTLine?
更新:
好的,我发现了这一点,但并不能解决我的问题,我希望行间距小于0.0点.
Okay, I found this but it don't solve my problem, I want less than 0.0point of line spacing.
CTTextAlignment paragraphAlignment = kCTLeftTextAlignment;
CGFloat maxLine = 0.0;
CTParagraphStyleSetting setting[2] = {
{kCTParagraphStyleSpecifierAlignment, sizeof(CTTextAlignment), ¶graphAlignment},
{kCTParagraphStyleSpecifierLineSpacingAdjustment, sizeof(CGFloat), &maxLine}
};
CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(setting, 2);
推荐答案
尝试使用kCTParagraphStyleSpecifierLineHeightMultiple
而不是kCTParagraphStyleSpecifierLineSpacingAdjustment
.那对我有用.
请注意,1.0行距是1.2 * yourLineHeight.
Try to use kCTParagraphStyleSpecifierLineHeightMultiple
instead of kCTParagraphStyleSpecifierLineSpacingAdjustment
. That worked for me.
Note, that 1.0 line spacing is 1.2 * yourLineHeight.
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