AppKit 中 UIKit 的 [NSString sizeWithFont:constrainedToSize:]

发布于 2024-10-18 02:16:28 字数 1035 浏览 4 评论 0原文

AppKit（适用于 Mac OS X 上的 Cocoa）中是否有任何等效方法与 UIKit 的 [NSString sizeWithFont:constrainedToSize:] 执行相同的操作？

如果不是，我怎样才能获得渲染受宽度/高度限制的特定字符串所需的空间量？

更新：下面是我正在使用的代码片段，我希望它能产生我想要的结果。

NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:
                            [NSFont systemFontOfSize: [NSFont smallSystemFontSize]], NSFontAttributeName,
                            [NSParagraphStyle defaultParagraphStyle], NSParagraphStyleAttributeName,
                            nil];
NSSize size = NSMakeSize(200.0, MAXFLOAT);
NSRect bounds;

bounds = [@"This is a really really really really really really really long string that won't fit on one line"
             boundingRectWithSize: size
             options: NSStringDrawingUsesFontLeading
             attributes: attributes];

NSLog(@"height: %02f, width: %02f", bounds.size.height, bounds.size.width);

我预计输出宽度将为 200，高度将大于单行的高度，但它会产生：

height: 14.000000, width: 466.619141

谢谢！

原文

Is there any equivalent method in AppKit (for Cocoa on Mac OS X) that does the same thing as UIKit's [NSString sizeWithFont:constrainedToSize:]?

If not, how could I go about getting the amount of space needed to render a particular string constrained to a width/height?

Update: Below is a snippet of code I'm using that I expect would produce the results I'm after.

NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:
                            [NSFont systemFontOfSize: [NSFont smallSystemFontSize]], NSFontAttributeName,
                            [NSParagraphStyle defaultParagraphStyle], NSParagraphStyleAttributeName,
                            nil];
NSSize size = NSMakeSize(200.0, MAXFLOAT);
NSRect bounds;

bounds = [@"This is a really really really really really really really long string that won't fit on one line"
             boundingRectWithSize: size
             options: NSStringDrawingUsesFontLeading
             attributes: attributes];

NSLog(@"height: %02f, width: %02f", bounds.size.height, bounds.size.width);

I would expect that the output width would be 200 and the height would be something greater than the height of a single line, however it produces:

height: 14.000000, width: 466.619141

Thanks!

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铁憨憨 2024-10-25 02:16:28

试试这个：

bounds = [value boundingRectWithSize:size options:NSLineBreakByWordWrapping | NSStringDrawingUsesLineFragmentOrigin attributes:attributes];

Try this one:

bounds = [value boundingRectWithSize:size options:NSLineBreakByWordWrapping | NSStringDrawingUsesLineFragmentOrigin attributes:attributes];

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·深蓝 2024-10-25 02:16:28

较新的 NSExtendedStringDrawing 类别 API（带有 NSStringDrawingOptions 参数的方法）在单行模式下运行。如果要在多线模式下测量/渲染，需要指定 NSStringDrawingUsesLineFragmentOrigin。

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新人笑 2024-10-25 02:16:28

编辑：您应该能够在 Lion 及更高版本中以正常方式执行操作。下面描述的问题已得到解决。

目前的 Mac OS X API 无法准确测量文本。

有几个 API 承诺可以工作，但实际上并没有。这是其中之一；核心文本用于此目的的功能是另一个。有些方法返回的结果很接近但错误；有些返回结果似乎毫无意义。我还没有提交任何关于这些的错误，但是当我这样做时，我会将雷达数字编辑到这个答案中。您还应该提交一个错误，并将您的代码包含在一个小型示例项目中。

[显然我已经提交了核心文本：8666756。它已作为未指定的其他错误的重复项而关闭。对于 Cocoa，我提交了关于 Dave 建议的方法的 9022238，明天将提交两个 NSLayoutManager 错误。]

这是我找到的最接近的解决方案。

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落日海湾 2024-10-25 02:16:28

如果要将字符串限制为特定大小，请使用 -[NSStringboundingRectWithSize:options:attributes:]。返回的 NSRect 的 .size 是您要查找的大小。

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风筝在阴天搁浅。 2024-10-25 02:16:28

下面是一个更完整的示例，说明如何使用boundingRectWithSize 来执行此操作。

// get the text field
NSTextField* field = (NSTextField*)view;

// create the new font for the text field
NSFont* newFont = [NSFont fontWithName:@"Trebuchet MS" size:11.0];

// set the font on the text field
[field setFont:newFont];

// calculate the size the textfield needs to be in order to display the text properly
NSString* text      = field.stringValue;
NSInteger maxWidth  = field.frame.size.width;
NSInteger maxHeight = 20000;
CGSize constraint   = CGSizeMake(maxWidth, maxHeight);
NSDictionary* attrs = [NSDictionary dictionaryWithObjectsAndKeys:NSFontAttributeName,newFont, nil];
NSRect newBounds    = [text boundingRectWithSize:constraint
                                         options:NSLineBreakByWordWrapping | NSStringDrawingUsesLineFragmentOrigin
                                      attributes:attrs];

// set the size of the text field to the calculated size
field.frame = NSMakeRect(field.frame.origin.x, field.frame.origin.y, field.frame.size.width, newBounds.size.height);

当然，有关其他信息，请查看 Apple 文档：

Here is a more complete example of how you can do this using boundingRectWithSize.

// get the text field
NSTextField* field = (NSTextField*)view;

// create the new font for the text field
NSFont* newFont = [NSFont fontWithName:@"Trebuchet MS" size:11.0];

// set the font on the text field
[field setFont:newFont];

// calculate the size the textfield needs to be in order to display the text properly
NSString* text      = field.stringValue;
NSInteger maxWidth  = field.frame.size.width;
NSInteger maxHeight = 20000;
CGSize constraint   = CGSizeMake(maxWidth, maxHeight);
NSDictionary* attrs = [NSDictionary dictionaryWithObjectsAndKeys:NSFontAttributeName,newFont, nil];
NSRect newBounds    = [text boundingRectWithSize:constraint
                                         options:NSLineBreakByWordWrapping | NSStringDrawingUsesLineFragmentOrigin
                                      attributes:attrs];

// set the size of the text field to the calculated size
field.frame = NSMakeRect(field.frame.origin.x, field.frame.origin.y, field.frame.size.width, newBounds.size.height);

Of course, for additional info, take a look at the Apple documentation:

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白鸥掠海 2024-10-25 02:16:28

如果您搜索 NSString 的文档，您将找到“NSString Application Kit Additions Reference”，它与 UIKit 的对应部分非常相似。

-[NSString sizeWithAttributes:]

就是您正在寻找的方法。

If you search the documentation for NSString, you will find the "NSString Application Kit Additions Reference", which is pretty much analogous to the UIKit counterpart.