- (int)getAttributedStringHeightWidthValue:(int)width byAtt:(NSMutableAttributedString *)attributedString
{
int total_height = 0;
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)attributedString); //string 为要计算高度的NSAttributedString
CGRect drawingRect = CGRectMake(0, 0, width, 100000); //这里的高要设置足够大
CGMutablePathRef path = CGPathCreateMutable();
CGPathAddRect(path, NULL, drawingRect);
CTFrameRef textFrame = CTFramesetterCreateFrame(framesetter,CFRangeMake(0,0), path, NULL);
CGPathRelease(path);
CFRelease(framesetter);
NSArray *linesArray = (NSArray *) CTFrameGetLines(textFrame);
CGPoint origins[[linesArray count]];
CTFrameGetLineOrigins(textFrame, CFRangeMake(0, 0), origins);
int line_y = (int) origins[[linesArray count] -1].y; //最后一行line的原点y坐标
CGSize size[[linesArray count]];
int line_height=(int) size[[linesArray count]-1].height;
CGFloat ascent;
CGFloat descent;
CGFloat leading;
CTLineRef line = (__bridge CTLineRef) [linesArray objectAtIndex:[linesArray count]-1];
CTLineGetTypographicBounds(line, &ascent, &descent, &leading);
total_height = 100000 + line_height - line_y + (int) descent +1;//+1为了纠正descent转换成int小数点后舍去的值
CFRelease(textFrame);
return total_height;
}
网友评论