NSString sizeWithAttributes:内容rect

Question

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:]时,它返回一个NSSize,好像它有无限宽度.我想给方法一个最大宽度.有没有办法这样做？(BTW:Mac OS,而不是iPhone OS)

谢谢,亚历克斯

Answer 1

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;
}

毕竟是在文档中.无论如何,谢谢Joshua!

Answer 2

我修改了Alexandre Cassagne对启用ARC的iOS 的答案.

CGSize ACMStringSize(NSString *string, UIFont *font, CGSize size)
{
    NSTextStorage *textStorage = [[NSTextStorage alloc] initWithString:string];
    [textStorage addAttribute:NSFontAttributeName value:font range:NSMakeRange(0, [textStorage length])];
    NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];
    NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:size];
    textContainer.lineFragmentPadding = 0;
    [layoutManager addTextContainer:textContainer];
    [textStorage addLayoutManager:layoutManager];
    return [layoutManager usedRectForTextContainer:textContainer].size;
}