NSString sizeWithAttributes：content rect [英] NSString sizeWithAttributes: content rect

问题描述

如何获得NSString的大小，就像它在NSRect中绘制一样。问题是当我尝试 - [NSString sizeWithAttributes：]，它返回一个NSSize，如果它有无限宽度。我想给方法的最大宽度。有什么办法吗？ （BTW：Mac OS，not iPhone OS）

How do I get a NSString's size as if it drew in an NSRect. The problem is when I try -[NSString sizeWithAttributes:], it returns an NSSize as if it had infinite width. I want to give a maximum width to the method. Is there any way of doing so? (BTW: Mac OS, not iPhone OS)

感谢，
Alex

Thanks, Alex

推荐答案

float heightForStringDrawing(NSString *myString, NSFont *myFont,
        float myWidth)
{
 NSTextStorage *textStorage = [[[NSTextStorage alloc] initWithString:myString] autorelease];
 NSTextContainer *textContainer = [[[NSTextContainer alloc] initWithContainerSize:NSMakeSize(myWidth, FLT_MAX)] autorelease];
 ;
        NSLayoutManager *layoutManager = [[[NSLayoutManager alloc] init] autorelease];
 [layoutManager addTextContainer:textContainer];
 [textStorage addLayoutManager:layoutManager];
 [textStorage addAttribute:NSFontAttributeName value:myFont
      range:NSMakeRange(0, [textStorage length])];
 [textContainer setLineFragmentPadding:0.0];

 (void) [layoutManager glyphRangeForTextContainer:textContainer];
 return [layoutManager
   usedRectForTextContainer:textContainer].size.height;
}

毕竟在文档中。谢谢Joshua！

It was in the docs after all. Thank you Joshua anyway!

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