我有一些文本,我正在绘制成一个固定的框架通过NSAttributedString (代码如下)。目前,我正在将文本大小硬编码为16。我的问题是,对于给定的框架,有没有一种方法可以计算出文本的最佳大小?
- (void)drawText:(CGContextRef)contextP startX:(float)x startY:(float)
y withText:(NSString *)standString
{
CGContextTranslateCTM(contextP, 0, (bottom-top)*2);
CGContextScaleCTM(contextP, 1.0, -1.0);
CGRect frameText = CGRectMake(1, 0, (right-left)*2, (bottom-top)*2);
NSMutableAttributedString * attrString = [[NSMutableAttributedString alloc] initWithString:standString];
[attrString addAttribute:NSFontAttributeName
value:[UIFont fontWithName:@"Helvetica-Bold" size:16.0]
range:NSMakeRange(0, attrString.length)];
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)(attrString));
struct CGPath * p = CGPathCreateMutable();
CGPathAddRect(p, NULL, frameText);
CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0,0), p, NULL);
CTFrameDraw(frame, contextP);
}
https://stackoverflow.com/questions/20468641
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