设置CoreText基本属性(二)
Size=sizeof(alignment);
alignmentStyle.value=&alignment;
//创建文本行间距
CGFloat lineSpace=5.0f;//间距数据
CTParagraphStyleSetting lineSpaceStyle;
lineSpaceStyle.spec=kCTParagraphStyleSpecifierLineSpacing;//指定为行间距属性
lineSpaceStyle.valueSize=sizeof(lineSpace);
lineSpaceStyle.value=&lineSpace;
//创建样式数组
CTParagraphStyleSetting settings[]={
alignmentStyle,lineSpaceStyle
};
//设置样式
CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(settings, sizeof(settings));
//给字符串添加样式attribute
[string addAttribute:(id)kCTParagraphStyleAttributeName
value:(id)paragraphStyle
range:NSMakeRange(0, [string length])];
// layout master
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString(
(CFAttributedStringRef)string);
CGMutablePathRef leftColumnPath = CGPathCreateMutable();
CGPathAddRect(leftColumnPath, NULL,
CGRectMake(0, 0,
self.bounds.size.width,
self.bounds.size.height));
CTFrameRef leftFrame = CTFramesetterCreateFrame(framesetter,
CFRangeMake(0, 0),
leftColumnPath, NULL);
// flip the coordinate system
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetTextMatrix(context, CGAffineTransformIdentity);
CGContextTranslateCTM(context, 0, self.bounds.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
// draw
CTFrameDraw(leftFrame, context);
// cleanup
CGPathRelease(leftColumnPath);
CFRelease(framesetter);
CFRelease(helvetica);
CFRelease(helveticaBold);
[string release];
UIGraphicsPushContext(context);
}